The primary air pollutants found in most urban areas are carbon monoxide, nitrogen oxides, sulfur oxides, hydrocarbons, lead, and particulate matter (both solid and liquid). These pollutants are dispersed throughout the world's atmosphere in concentrations high enough to gradually cause serious health problems.

The light-headed or nauseous feeling one may get when in an enclosed parking garage or a tunnel, may be the effects of carbon monoxide (CO). This odorless, colorless, but poisonous gas is produced by the incomplete burning of fossil fuels, like gasoline or diesel fuel. Carbon Monoxide comes from cars, trucks, gas furnaces and stoves, and some industrial processes. CO is also a toxin in cigarettes. Carbon Monoxide combines with hemoglobin in the red blood cells, so body cells and tissues cannot get the oxygen they need. Carbon Monoxide attacks the immune system, especially affecting anyone with heart disease, anemia, and emphysema and other lung diseases. Even when at low concentrations CO affects mental function, vision, and alertness.

When observed near the ground, ozone may be described as a colourless, gaseous pollutant. It is formed by chemical reactions between reactive organic gases and oxides of nitrogen in the presen

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