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Air pollution can cause diseases, allergies, and even death; it can also cause harm to animals and crops and damage the natural environment (for example, climate change, ozone depletion or habitat degradation) or built environment (for example, acid rain). [3] Air pollution can occur naturally or be caused by human activities. [4]
Looking down from the Hollywood Hills, with Griffith Observatory on the hill in the foreground, air pollution is visible in downtown Los Angeles on a late afternoon.. Air pollution is the introduction of chemicals, particulate matter, or biological materials into the atmosphere that cause harm or discomfort to humans or other living organisms, or damage ecosystems.
Air pollution is among the biggest health problems of modern industrial society and is responsible for more than 10 percent of all deaths worldwide (nearly 4.5 million premature deaths in 2019), according to The Lancet. Air pollution can affect nearly every organ and system of the body, negatively affecting nature and humans alike.
According to the Environmental Protection Agency, emissions from six major pollutants in the country have plunged about 80% since 1970, when the Clean Air Act empowered the agency to regulate ...
This was the first time the EPA reviewed the environmental impacts separate from the health impacts for this group of criteria air pollutants. [18] Also, in 2010, the EPA decided to ensure compliance by strengthening monitoring requirements, calling for increased numbers of monitoring systems near large urban areas and major roadways.
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Major domestic pollutants contain 17% of carbon dioxide, 13% of carbon monoxide, 6% of nitrogen monoxide, polycyclic aromatic hydrocarbons, and fine and ultrafine particles. [16] In the United Kingdom domestic combustion is the largest single source of PM2.5 annually.
Vehicular emissions are the single largest contributor to the capital’s toxic air, accounting for 51.5 per cent of locally generated pollution, according to the Centre for Science and Environment.