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The lethal combination of outdoor air pollution and toxic emissions from burning fossil fuel has been one of the leading causes of chronic and often terminal health issues including heart disease, stroke, lung cancer, and lower respiratory infections.
Air pollution, release into the atmosphere of various gases, finely divided solids, or finely dispersed liquid aerosols at rates that exceed the natural capacity of the environment to dissipate and dilute or absorb them. High concentrations can cause undesirable health, economic, or aesthetic effects.
Learn about what causes air pollution and how to help reduce the effects. How smog, soot, greenhouse gases, and other top air pollutants are affecting the planet—and your health.
Pollutants of major public health concern include particulate matter, carbon monoxide, ozone, nitrogen dioxide and sulfur dioxide. Outdoor and indoor air pollution cause respiratory and other diseases and are important sources of morbidity and mortality.
The largest cause of air pollution is fossil fuel combustion [171] – mostly the production and use of cars, electricity production, and heating. [172] There are estimated 4.5 million annual premature deaths worldwide due to pollutants released by high-emission power stations and vehicle exhausts. [173]
The Short Answer: Air pollution is caused by solid and liquid particles and certain gases that are suspended in the air. These particles and gases can come from car and truck exhaust, factories, dust, pollen, mold spores, volcanoes and wildfires.
Today, the burning of fossil fuels—in vehicles, airplanes, power plants and factories—is still a major source of air pollutants, meaning substances that contaminate the air. Cigarette and e-cigarette (or vape) smoke are also considered air pollution.