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Air pollution - Wikipedia Air pollution is the presence of substances in the air that are harmful to humans, other living beings or the environment Pollutants can be gases, like ozone or nitrogen oxides, or small particles like soot and dust Both outdoor and indoor air can be polluted
Air pollution | Effects, Causes, Definition, Facts | Britannica 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
Air pollution - World Health Organization (WHO) Air pollution is contamination of the indoor or outdoor environment by any chemical, physical or biological agent that modifies the natural characteristics of the atmosphere Household combustion devices, motor vehicles, industrial facilities and forest fires are common sources of air pollution
Air Pollution and Your Health | National Institute of . . . Air pollution is a familiar environmental health hazard We know what we’re looking at when brown haze settles over a city, exhaust billows across a busy highway, or a plume rises from a smokestack Some air pollution is not seen, but its pungent smell alerts you
Air Pollution: Current and Future Challenges - US EPA Despite the dramatic progress to date, air pollution continues to threaten Americans’ health and welfare The main obstacles are climate change, conventional air pollution, and ozone layer depletion
Air Pollutants | Air Quality | CDC Outdoor air quality has improved since the 1990s, but many challenges remain in protecting Americans from air quality problems The EPA regulates six pollutants as “criteria” air pollutants