* Carbon monoxide - a colorless and odorless poison, it is a gas produced when fuel incompletely burned in engines, furnaces and space heaters. A major source of this is the Vehicles.For example Motor vehicles produce about 60 percent of carbon monoxide nationwide; in cities, it may be as high as 95 percent. Other sources include industrial processes, non-transportation fuel combustion, and wildfires. Carbon Dioxide - a produced by normal combustion (burning). Although it is not a serious pollutant, it is believed that the continuous build up of this gas in the atmosphere could cause what they call a " green house effect" by reducing the flow of heat from the earth back into the space, thus causing a possible warming of the earth. The greenhouse effect is when the temperature rises because the sun’s heat and light is trapped in the earth’s atmosphere. This is like when heat is trapped in a car. On a very hot day, the car gets hotter when it is out in the parking lot. This is because the heat and light from the sun can get into the car, by going through the windows, but it can’t get back out. This is what the greenhouse effect does to the earth. The heat and light can get through the atmosphere, but it can’t get out. As a result, the temperature rises..For example Carbon dioxide is the air that our body lets out when we breathe. With fewer trees, it is harder for people to breathe because there is more CO2 in the air, and we don’t breathe CO2, we breathe oxygen. Plants collect the CO2 that we breathe out, and they give back oxygen that we breathe in. With less trees and other plants, such as algae, there is less air for us, and more greenhouse gases are sent into the air. This means that it is very important to protect our trees to stop the greenhouse effect, and also so we can breathe and live. Carbon dioxide is a greenhouse gas that traps the earth's heat and contributes to Climate Change
* Sulfur dioxide - one of the most dangerous of all air pollutants. The major sources of this pollutants are Factories and electric power plants that use sulfur-containing coal or oil as fuel. In the air, some sulfur dioxide is converted to sulfuric acid, which is then deposited on the earth's surface, usually by rain. This acid rain has caused damage to the environment in many parts of the world.For example Combustion of fuel containing sulfur -- mostly coal and oil. Also produced during metal smelting and other industrial processes. Nitrogen oxide - are mildly poisonous brown gas. These are produced in automobile engines and other devices where combustion takes place. Gas ranges are a major source of nitrogen oxides.For example NO2 forms quickly from emissions from cars, trucks and buses, power plants, and off-road equipment. In addition to contributing to the formation of ground-level ozone, and fine particle pollution, NO2 is linked with a number of adverse effects on the respiratory system. *
.tobacco- As a cigarette burns and its smoke is released, tiny particles of the more than 4,000 chemicals packed into the cigarette are released into the air. In addition, the smoke that is inhaled by the smoker can not be totally absorbed by the lungs, so it is released with small amounts of the original pollutants plus trace amounts of the smoker's bodily fluids. As these particles float upward on the cigarette's smoke, they dissipate into the surrounding air to produce pollution. Many of the particles and bodily fluids produced during the smoking process are short lived, so the greatest pollution effect is in the area immediately surrounding the smoker.For example It...