Monday, April 13, 2009

Welcome to our blog...Hdop mzty arr jujow..!Our group members are Haidar,Asyraf,Dzariz,Nadziephah n Husna.....Life must be honest..!haha...:) :p
We'r here cuz of da english project about da pollution..We don't know wt kind of pollution..hehe..:p...but we know it...hakhak..;)
N now,,,we'r gonna tell somthin bout it...blieve us cuz we can do it...!
Lyk wt we said,,hdop mzty arr jujow...:)

air pollution

Air is the ocean we breathe. Air supplies us with oxygen which is essential for our bodies to live. Air is 99.9% nitrogen, oxygen, water vapor and inert gases. Human activities can release substances into the air, some of which can cause problems for humans, plants, and animals. There are several main types of pollution include smog,acid rain, the greenhouse effect, and "holes" in the ozone layer. Each of these problems has serious implications for our health and well-being as well as for the whole environment.
One type of air pollution is the release of particles into the air from burning fuel for energy. Diesel smoke is a good example of this particulate matter . The particles are very small pieces of matter measuring about 2.5 microns or about .0001 inches. This type of pollution is sometimes referred to as "black carbon" pollution. The exhaust from burning fuels in automobiles, homes, and industries is a major source of pollution in the air. Some authorities believe that even the burning of wood and charcoal in fireplaces and barbecues can release significant quantities of pollution into the air.
Another type of pollution is the release of noxious gases, such as sulfur dioxide, carbon monoxide, nitrogen oxides, and chemical vapors. These can take part in further chemical reactions once they are in the atmosphere, forming smog and acid rain.
Indoor Pollution

Pollution also needs to be considered inside our homes, offices, and schools. Some of these pollutants can be created by indoor activities such as smoking and cooking. Some people spend about 80-90% of their time inside buildings, and so our exposure to harmful indoor pollutants can be serious. It is therefore important to consider both indoor and outdoor air pollution. Most people are aware that outdoor air pollution can damage their health but may not know that indoor air pollution can also have significant effects. Scientists study human exposure to air pollutants indicate that indoor air levels of many pollutants may be 2-5 times, and occasionally more than 100 times, higher than outdoor levels.
These levels of indoor air pollutants are of particular concern because it is estimated that most people, including children, spend as much as 90% of their time indoors.
Over the past several decades, our exposure to indoor air pollutants is believed to have increased due to a variety of factors, including the construction of more tightly sealed buildings, reduced ventilation rates to save energy, the use of synthetic building materials and furnishings, and the use of chemically formulated personal care products, pesticides, and household cleaners.
In recent years, comparative risk studies that in close cooperation with a effort to a better understand indoor air pollution and to reduce people's exposure
to air pollutants in homes, schools, and other environments where children.
Environmental Tobacco Smoke
(Secondhand Smoke)

The Centers for Disease Control and Prevention's (CDC) National Center for Environmental Health reports that 43 percent of children, two months through 11 years of age, live in a home with at least one smoker. Children who live with smokers involuntarily inhale many pollutants in smoke. Environmental tobacco smoke (ETS), also known as secondhand smoke, is a complex mixture of more than 4,000 chemicals, including carbon monoxide , nicotine, tars, formaldehyde and hydrogen cyanide. Several of these chemicals are known human carcinogens or respiratory irritants.
Children exposed to ETS tend to have more bronchitis, pneumonia, respiratory infections, otitis media (fluid in the middle ear), and asthma symptoms. The frequency of infection depends directly on the amount of smoke in the home. Children who live with two smoking parents have more respiratory infections than children who live with one smoking parent. The lowest rates of respiratory infections and asthma are found in children of parents who do not smoke at all. Maternal smoking during pregnancy is associated with an increased incidence of Sudden Infant Death Syndrome.
They estimates that between 150,000 and 300,000 cases of lung infections, such as bronchitis and pneumonia, that occur annually in infants and young children up to 18 months of age may be attributed to exposure to ETS. Of these, 7,500 to 15,000 will result in hospitalization. ETS exposure aggravates the condition of between 200,000 and 1,000,000 asthmatic children. EPA has found that ETS increases fluid in the middle ear, a sign of chronic middle ear disease, the most common cause of hospitalization for surgery in children.
The CDC estimates that children exposed to tobacco smoke in their homes have 18 million more days of restricted activity, 10 million more days of bed confinement, and miss 7 million more school days annually than other children, primarily due to acute and chronic respiratory conditions.

Relax, breath deeply, and let's talk about the air you just breathed in.
Smog is a nasty mixture of chemicals in the air that can harm human health. As proof, just look how emergency room admissions increase whenever there's a high smog period. For some people, smog causes headaches, burning eyes, coughing, and shortness of breath. Those most at risk are young children, the elderly, and people with asthma and respiratory illnesses. If you suffer from these ailments, stay indoors during periods of high air pollution. Even healthy adults can have trouble breathing when smog levels are high. During smog advisories avoid taking part in strenuous outdoor activities, especially near high traffic areas.
Smog levels are often highest during hot, sunny summer days. Levels are particularly high in cities that lie within the Quebec Windsor corridor, lower New Brunswick and the Lower Fraser Valley near Vancouver. While smog is a problem for urban dwellers, it can also be carried by the wind into rural areas, producing levels as high as, or higher than, those found in cities.
The major sources of smog are motor vehicles, coal fired power plants, and industrial emissions. You can help make things better.
Did you know?
• In Ontario, Canada 15 percent of all infant respiratory admissions to hospitals in the summer are related to high levels of air pollution. Worse yet, in the past decade, childhood asthma rate have increased by 60%.
• The Ministry of the Environment has estimated that smog causes 1,800 premature deaths each year in Ontario.
• Air pollution, much of it caused by smog, adds an extra $1 billion each year to Canada's health costs, according to federal estimates.
• More than 13 million cars now traverse Canada's roads — one for every two Canadians, one of the highest ratios of car ownership in the world. Each of these cars travels, on average, more than 16,000 km per year, a total of some 200 billion kilometers, or more than 1,000 times the distance between the Earth and the sun.
• According to the Canadian Automobile Association, it costs $7,412 to own and operate a motor vehicle. Compare this to $912 for a yearlong transit pass in Toronto or $300 to own and operate a bicycle. A single bus can take up to 40 vehicles off the road, save as much as 70,000 liters of fuel and keep 9 tones of air pollutants per year out of the air.
More Information about Smog
Smog is a serious threat to human health, but there are many ways to reduce this threat. Progress has been made on reducing many smog pollutants through vehicle technology improvements, but the smog problem has not been solved. Gains made through these improvements are lost as more and more cars crowd the roads. The travel choices we make every day can lead to improvements in air quality, enhance our sense of well-being and enrich our communities. Healthy living involves being active. Taking transit, walking, cycling, running and inline skating are action oriented activities that provide pleasant alternatives to our often sedentary lifestyles.
The benefits of clean air don't stop with human health. With more people reducing their car use, less money will be spent on the construction and maintenance of roads. And when we do drive, there will be less congestion, reduced stress and hopefully fewer incidents of "road rage". Even our health care system will be less strained as fewer people visit their doctors or go to hospitals. I believe that's a future people will work towards. We hope you'll prove us right.
In the summer, listen to the radio for smog advisory warnings. When smog levels are high, avoid exercising outside. If you have chronic respiratory problems, asthma or heart disease, stay indoors at these times, and always make sure that you take your medication as prescribed by your doctor. I also urge you to take action to reduce smog and make your air, our air, safer to breathe. Please follow the advice and take action today to combat smog. It's our greatest hope for a cleaner and healthier tomorrow.
Nitrogen Dioxide (NO2) and Nitric Oxide (NO)

Nitrogen dioxide (NO2) is one of a number of important oxides of nitrogen present in the atmosphere. Nitric oxide (NO) and nitrogen dioxide (together termed NOx) are the most abundant man-made oxides of nitrogen in urban areas; these are formed in all high temperature combustion processes, although nitric oxide predominates. Nitric oxide is not generally considered to be harmful to health at the concentration found in the ambient atmosphere.
Approximately 45% of all oxide of nitrogen emission originates from motor vehicles, with most of the remainder arising from power stations and other industrial sources. Since power station and industrial emissions are usually from elevated sources, motor vehicles represent by far the lowest source of low-level nitrogen dioxide emission and therefore make the largest contribution (about 75% or more) to long term ground level concentrations in urban areas.
The highest NOx levels in cities are observed at curbside locations. However, since NO2 is formed from primary emissions of NO by time dependent oxidation processes in the atmosphere, the relative decline in NO2 concentration away from the curbside is slower than for NO.
Several surveys using diffusion tube samplers for NO2 have been undertaken to determine the distribution of background concentrations of NO2 in cities. These have shown that, in general, NO concentrations are greatest in central urban areas. However, this cannot be assumed to be the case: for instance, a recent study in Sheffield identified an industrial area, close to the M1 motor way, with higher NO2 concentrations than the city center.
Sulphur Dioxide (SO2)

Sulphur Dioxide (SO2) is formed by the oxidation of sulphur impurities in fuels during combustion processes. A very high proportion (approximately 85%) of SO2 emissions originates from power stations and industrial sources. As the use of coal for domestic heating has decreased, SO2 emissions and atmospheric concentrations in urban areas have decreased considerably over the last 20-30 years.

Though virtually no SO2 is emitted from petrol engine vehicles, it is emitted from diesels and, as the use of these has increased, curbside concentrations of this pollutant are now observed to be higher than at urban background locations.

Geographically, SO2 concentrations the are highest in urban areas where there is still significant use of coal for domestic heating, such as mining region. Studies have indicated that the highest SO2 concentrations in cities usually occur in the central areas of North America.
Carbon Monoxide (CO)

Carbon Monoxide is a tasteless, odorless, and colorless gas. Carbon Monoxide is created by the incomplete combustion of any carbon-containing fuel, including gasoline and diesel vehicles. It is poisonous to the environment which includes any living organism; plants, animals and humans. CO enters the bloodstream through the lungs and reduces oxygen delivery to the body, organs and tissues. The gas combines with the hemoglobin in our blood, impairing the flow of oxygen to our brain and other parts of the body.
The health threat from carbon monoxide is most serious for those who suffer from cardiovascular disease. At higher levels of exposure, healthy individuals are also affected.
The amount of CO released into the air depends on the emission rate for individual vehicles and the vehicles speed, being highest at very low speeds (traffic).
Since CO is a primary pollutant, its ambient concentrations closely follow emissions. In urban areas, concentrations are therefore highest at the curbside and decrease rapidly with increasing distance from the road. No detailed investigations of the spatial distribution of CO in UK urban areas have been undertaken. However, since traffic is by far the most important source of CO, its spatial distribution will follow that of traffic: this will generally result in the highest level being observed in the city centre


What is air pollution?
What is the effect of air pollution?
What is the cause of air pollution?

Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or damages the natural environment, into the atmosphere.

Air pollution will effect our health.

Air pollution come from human activity such as open burning and others.

land pollution
What is Waste?
Waste is something left or not used, such as garbage, trash, litter, or even broken toys and old automobile tires. Finding places to dispose of waste has become a serious problem because there is so much waste and so little space to put it in. We ca control how much we produce by the three R's of the environment-reducing, reusing and recycling.

Reducing means using less. If we try to use fewer things that will produce trash, we will be taking the first step toward solving the waste problem. Choose things like cloth towels instead of paper towels. By doing this you will not only save money but also the environment.


Reusing is taking items you would ordinary throw away and finding ways to use them again, like cloth towels instead of paper towels. Many people reuse cardboard boxes, glass jars, grocery bags, cards, and envelopes. You can save and reuse plastic bags by turning them inside out, rinsing them, and letting them dry. You can wrap a Birthday present with a Sunday newspaper, the comic section.

Recycling is processing waste so that we can use it again. Some of the things people recycle are aluminum, glass, paper, and plastic. When we recycle things, less trash finds its way into bulging garbage dumps. Recycling also uses less energy and natural resources than making new products.
Landfills are enormous holes where people dump their garbage. To create landfills, they usually set it up in a natural pit where a low-lying land is surrounded by hills. Sometimes, if the hole isn't big enough, they use earth-moving machines to deepen the hole and build up the sides. They line the inside of the pit to keep any waste from seeping out. Trucks then dump the garbage into the landfill, and tractors spread it around and cover each layer of garbage dirt

water pollution
People cause water pollution when they dump wastes such as chemicals, metals, and oil into oceans, lakes, streams, and so on. Water pollution is a serious problem in Canada and the US. When we pollute water, it can look dirty and smell really bad. Sometimes polluted water contains chemicals and germs that not only kills the aquatic ecosystem, but can make people ill and in some cases, death.

Green water has too many tiny plants called algae growing in it. When algae die, they decompose and use up oxygen that animals need to survive.

Foam or suds in the water which comes from detergents from homes or factories. If the water smells rotten, it might mean sewage has been dumped nearby.

It is difficult to identify all polluted water by appearance because sometimes polluted water doesn't shows no signs.

The Pollution Problem

It is easy to dispose of waste by dumping it into a river or lake. In large or small amounts, dumped intentionally or accidentally, it may be carried away by the current, but will never disappear. It will reappear downstream, sometimes in changed form, or just diluted. Freshwater bodies have a great ability to break down some waste materials, but not in the quantities discarded by today's society. This overload that results, called pollution, eventually puts the ecosystem out of balance.
Sometimes nature itself can produce these imbalances. In some cases, the natural composition of the water makes it unfit for certain uses: e.g., water flowing in the highly saline terrain of the prairies or gushing from highly mineralized springs in some parts of the country cannot sustain fish populations.
But most often our waterways are being polluted by municipal, agricultural and industrial wastes, including many toxic synthetic chemicals which cannot be broken down at all by natural processes. Even in tiny amounts, some of these substances can cause serious harm.
The Great Lakes, the Fraser River, and the St. Lawrence River are and continue to be seriously contaminated by such toxic chemicals.


Mercury is a toxic heavy metal, which, when ingested, can cause serious neurological damage, particularly to developing fetuses, infants and children. Consequences of exposure to mercury include permanent and irreversible developmental delaysin learning to walk and talk, in coordination, visual loss, cerebral palsy, mental retardation, abnormal heart rhythms, abnormal reflexes, liver digestion and gastrointinal disturbances. People most at risk include women of childbearing age, pregnant women, nursing mothers, and subsistence fisher people.
Mercury makes its way into our diets primarily by first being emitted into the air and then washed into lakes and streams by rain and snow, where it reacts with bacteria to form organic mercury, the form most toxic to humans.
Mercury comes from coal and oil (32.8 %) burning electric power plants, municipal waste incinerators (18.7%), commercial and industrial boilers (10.1%) hazardous waste incinerators (4.4%) and manufacturing plants (10 %).

The release of mercury into the environment is harmful to both the ecosystem and human health. The comprehensive phase out of mercury's release is ultimately important because of its ability to persist in the environment for a long time. It can then bioaccumulate in aquatic food chains, to the point that consumption of fish is hazardous to birds, mammals and humans. There has been groups that has been working hard to achieve full mercury phase out, and has had many successes to date.


Cadmium is one group of elements known as "heavy metals". They are pollutants produced by industries and mining which can be dangerous to humans and animals even in very small quantities. In the case of cadmium, for example, the World Health Organization (WHO) recommends that drinking water that contains less then 0.000175 thousandths of an ounce of cadmium per quart (one quarter of a gallon). Concentrations greater than this cause disease of the kidneys and reproductive organs in humans.

Lead (PB)

Exposure to lead occurs mainly through the inhalation of air and the ingestion of lead in food, water, soil, and/or dust. It accumulates in the blood, bones and soft tissues. Because it is not readily excreted, lead can also adversely affect the kidneys, live, the nervous system and other organs.

Excessive exposure to lead may cause neurological impairments such as seizures, mental retardations and/or behavioral disorders. At low doses, fetuses and children often suffer from central nervous system damage. Recent studies also show that lead may be a factor is high blood pressure and subsequent heart disease.

What are the main source of water pollution?

The main source of water pollution is sewage, industries, and agriculture. Sewage is human wastes and water that has been used for bathing and cleaning clothes.
Industry puts three to four more times as many pollutants into water as all of our sewage systems do.
Chemicals and other wastes from farms also pollute our water.

Some farmers use chemical fertilizer to help their crops grow. They also use pesticides to kill pests such as insects and weeds. Rain water can carry these chemicals from the farmland into streams, and rivers. Animal wastes from farms also add to water pollution.

Aquatic ecosystems

In nature nothing exists alone. Living things relate to each other as well as to their non-living, but supporting, environments.
These complex relationships are called ecosystems. Each body of water is a delicately balanced ecosystem in continuous interaction with the surrounding air and land.

Whatever occurs on the land and in the air also affects the water. If a substance enters a river or lake, the water can purify itself biologically — but only to a degree. Whether it is in the smallest stream or lake — or even in the mighty oceans — the water can absorb only so much. It reaches a point where the natural cleaning processes can no longer cope.

How does pollution affect marine life?

People dump hazardous materials into the ocean to get rid of them. Sewage and waste from factories and cities can reach the ocean. This pollution is very harmful. It can kill the plants and animals living in the ocean. Dangerous chemicals like mercury kill the aquatic environment very quickly. Over 360 chemical compounds that have been identified in the Great Lakes. Many are persistent toxic chemicals such as DDT, and mercury potentially dangerous to humans and already destructive to the aquatic ecosystems.

For example, various species of fish now suffer from tumors and lesions, and their reproductive capacities are decreasing. Populations of fish consuming birds and mammals also seem to be on the decline. Of the ten most highly valued species of fish in Lake Ontario, seven have now almost totally vanished.

How to tell if a river/ lake is polluted

· If it has an uncontrolled amount of organic material such as sewage, milk, silage, liquids etc. that is affecting a waterway, the main sign that the water is polluted is that the water would be choked with vegetation.

· In the case of acid rain, the affect on the water is quite the opposite. The water will appear to be crystal clear. This is because the water is too acidic for fish etc. to live in.

· There may be bad smells where toxic waste is involved


What is water pollution?
What is the effect of water pollution?
What are the causes of water pollution?


Water pollution is the contamination of water bodies such as lakes, rivers, oceans, and groundwater caused by human activities, which can be harmful to organisms and plants that live in these water bodies. It occurs when pollutants are discharged directly into water bodies without treating it first.

In rivers, oceans and seas, water pollution effects flora and fauna in them. Further, the birds and animals that consume this contaminated food supply can perish. Blood diseases, nervous system disorders and heart diseases are some of the effects of water pollution. Many toxins in polluted water lead to cancer. Rarely, the body's chromosomal makeup can be altered. Some of the less potent effects are skin lesions, vomiting and diarrhea.

People cause water pollution when they dump wastes such as chemicals, metals, and oil into oceans, lakes, streams, and so on

global change

Every day, millions of human and natural activities are altering the planet on which we live. Over the past century, through our ever-increasing population and mastery of technology, we have been changing the global environment at a pace unknown to natural history.
Greenhouse Effect
Some gases in the Earth's atmosphere act like a greenhouse. The gases let sunlight through and then traps some of it's heat. This natural greenhouse effect warms the Earth just enough for plants and animals to live.
Greenhouse gases such as methane and carbon dioxide trap heat near the Earths They are natural part of our atmosphere. People also make greenhouse gases when we burn coal and oil. For example, we make tons of carbon dioxide. These extra gases build up in the atmosphere. This traps more heat and makes the Earth warmer. This is called a global warming.
Global Warming
Global warming is the slow rise in the Earth's temperature. One cause of global warming is the greenhouse effect. If the world's average temperature rises just a little, conditions all over the world could change and cause problems for every living thing.
Some areas could turn into deserts, and others could become permanently flooded (watch the movie "Water World").
Global warming will not happen all of a sudden. We will not see it's effect in the next few months or years. Even though the most harmful effects may not happen in our lifetime, we should learn about global warming and try to stop it.

You can help stop global warming by cutting down on the use of fossil fuels. Walk or ride your bike if you can, instead of riding your car. When you do this, you can use less fuel and create less greenhouse gases. Planting a tree will also help. Trees remove carbon dioxide (see air pollution) from the air.
Shocking Facts
• Mountain Kilimanjaro has lost 75% of it's ice cap since 1912. This ice of Africa's tallest peak could vanish entirely within 15 years.
• Lake Baikal in eastern Siberia now freezes for the winter 11 days later than it did a century ago.
• Montana will lose all the glaciers in Glacier National Park by 2070 if their retreat continues at the current rate.
• Venezuelan mountains had six glaciers in 1972. Today only two remain.
• India's worst heat shock in 50 years killed more than 2,500 people in May 1998.
• Cherry Blossoms in Washington bloom seven days earlier in the spring than they did in 1970.
• Pacific Salmon populations fell sharply in 1997 and 1998, when local ocean temperatures rose 3*C.
• Polar Bears in Hudson Bay are having fewer cubs, possibly as a result of earlier spring ice breakup.
• Coral Reefs suffer from the loss of algae that color and nourish tem. The process, called bleaching, is caused by warmer oceans.
• Diseases like dengue fever are expanding their reach northward in the U.S.

Nuclear Power
Nuclear power stations produce cheaper energy than coal power stations, which helps keep the size of electricity bills down. However, just the burning of coal produces wastes that pollute the environment, nuclear power stations too produce a slightly different waste. These wastes are know as “radioactive wastes” which are very harmful to any type of life and can take hundreds of years to become harmless.
Nowadays, great care is taken to dispose of these wastes in a safe way, but because the waste is stored or buried in particular sites, the dangers of radiation may be greater in these areas. Perhaps the most damaging environment consequences of nuclear power are the potential for accidents. Nuclear power stations are built to be as safe as possible, but humans make mistakes. Although accidents of nuclear plants are statistically very rare, the damage that they would cause is devastating. For example, on April 26th, 1986, two explosions destroyed one of the four nuclear power reactors at Chernobyl, a small town in Russia. Many governments consider the risk to be worth taking, but not everyone agrees with this view.
Radioactive Waste
Nuclear power production produces radioactive waste, which may be a gas, liquid, or solid. These radioactive wastes are normally classified according to their level of radioactivity; high, intermediate and low.
High levels waste remains very dangerous for tens of thousands of years. At present it is turned into glass blocks and stored. Eventually it may be buried.
Intermediate level waste needs to be isolated for thousands of years. It too will probably be buried.
Low levels waste used to be dumped at sea in drums until this was thought to be too dangerous and was stopped in 1983. In Britian, radioactive waste was buried at Drigg in Cumbria. Other low level waste, from the nuclear plant at Sellafielel was released into the Irish Sea. Some people say this is safe but others disagree since the occurrence of leukemia, a disease which attacks red blood cells, is very high around Sellafielel.

oil pollution
The oceans are a key part of the world environment and the seas are important for a variety of economic activities. Among these activities are exploitation of mineral resources, fishing, tourism, trade, exploitation of energy, recreation and transportation.
Sometimes off shores wells, leaky pipelines or oil tankers will spill oil. Oil does not mix with water, the oil just forms a widespread film on top of the water. This floating film is called a oil slick. Oil spills that wash up on land can ruin beaches and shorelines and threaten the plants and animals that live there. The consequences of major oil spills from tankers can be more catastrophic if they are near the coastline. This is because both animals from the land and sea use the shorelines to hunt their food, mate, gather, live and rest. If an oil spill occurred in the middle of the Pacific Ocean for example, it would only affect the marine animals in that area. It still however, would have a horrible affect on the environment.
An oil spill can kill or damage anything that comes in contact with it like birds, fish, otters, turtles, or any other aquatic wildlife. Oil spills are very difficult and expensive to clean up. To clean up oil spills, workers must make a ring of floating devices called booms around the oil spill to stop it from spreading. A pump then collects the oil that floats on the surface of the water. Sometimes clean up crew use material that absorb or soak up the oil spills.
The most important source of oil that enters the sea is that from urban and industry areas that release directly into the oceans or into rivers that flow to the seas. This oil pollutes areas that are usually most important to coastal activities. Over a million tons of oil a year enter the sea deliberately from ships, most of it from tankers that wash out their empty tanks with sea water. Although this is illegal, many tankers still do it in the high seas where no one can see them.
When oil spills occur, oil soaks into the feathers of birds. This removes the air layer that protects them from the cold. Being covered with oil also makes it hard for sea animals to swim since they are unable to dive for food or swim away from predators. The oil can get into their eggs which are laid at the water's edge and kill the baby animals inside. Fish can die because the oil clogs their gills and they can't breathe. Oil also contaminates the food and water needed by the sea animals.
The Mediterranean
The Mediterranean is the filthiest sea in the world. The sea is almost totally enclosed, and takes about 70 years for it's waters to be renewed, since the pollution tends to stay in the sea.
The major pollution sources include domestic sewage from towns and cities, wastes from industries, rivers that collect fertilizers from agricultural land and toxic wastes from nuclear power plants. The sewage varies seasonally in the areas where population increases during the tourist season. Disease associated with bathing in contaminated waters or eating contaminated seafood is very common around the Mediterranean.
Pictures of Oil Pollution are available in the Water Pollution section of the Pictures page.