Long-term exposure leads to scarring of lung tissue and lowered lung efficiency. Ozone does not come directly from tailpipes or smokestacks, but forms when sunlight interacts with exhaust hydrocarbons and nitrogen oxides. Particulates Aggravates existing heart and lung diseases, changes the body's defenses against inhaled materials, and damages lung tissue. The elderly, children and those with chronic lung or heart disease are most sensitive. Lung impairment can persist for 2-3 weeks after exposure to high levels of particulate matter.
Chemicals carried by particulates can also be toxic.
Diesel cars, trucks and buses, power plants, industry and many other sources. Lead Destroys the brain and nervous system. Some industrial facilities and from lead-based paint. Healthy individuals should reduce outdoor activities, such as jogging. Ground-level ozone affects our health, but ozone also forms naturally in the upper atmosphere.