Air pollution is the human introduction into the atmosphere of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or damages the environment. Air pollution causes deaths and respiratory disease. Air pollution is often identified with major stationary sources, but the greatest source of emissions is mobile sources, mainly automobiles. Gases such as carbon dioxide, which contribute to global warming, have recently gained recognition as pollutants by climate scientists, while they also recognize that carbon dioxide is essential for plant life through photosynthesis. The atmosphere is a complex, dynamic natural gaseous system that is essential to support life on planet Earth. Stratospheric ozone depletion due to air pollution has long been recognized as a threat to human health as well as to the Earth's ecosystems. Actualy primary pollutant are release in a harmful form. Secondary pollutant, by contrast, become hazadous after reaction in the air. Photochemical oxidants which is compound created by reaction driven by solar energy and atmospheric acids are probably the most important secondary pollutant. Fugitive or nonpoint source, emission are those that do not go through a smokestack. By far most massive examples of this category is dust fri]om soil erosion, strip mining, rock crushing and building construction. Leaking valves and pipe joints contributes as much as 90 percent of the hydrocarbons and volatile organic chemicals emitted from oil refines and chemial plants.
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