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The document discusses air pollution and its effects on human health. It notes that air pollution is a major environmental risk factor for diseases like asthma, lung cancer, and heart disease. Long-term exposure to air pollution can cause damage to organs like the heart, lungs, brain, kidneys, and liver, and may be linked to birth defects. The six main air pollutants are carbon monoxide, lead, nitrogen oxides, ground-level ozone, particulate matter, and sulfur oxides.

