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The six criteria air pollutants were the first set of pollutants recognized by the United States Environmental Protection Agency as needing standards on a national level. [5] The Clean Air Act requires the EPA to set US National Ambient Air Quality Standards (NAAQS) for the six CAPs. [6]
[4] [5] It is the fourth-largest risk factor overall for human health [6] and in 2018, WHO estimated that "9 out of 10 people breathe air containing high levels of pollutants." [ 7 ] Outdoor particulate pollution ( PM2.5 ) is the largest cause of death (4 million), followed by indoor air pollution (over 2 million) and ozone (0.4 million).
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.
A 2002 study found that "Each 10 μg/m 3 elevation in fine particulate air pollution was associated with approximately a 4%, 6% and 8% increased risk of all-cause, cardiopulmonary, and lung cancer mortality, respectively."
In 1970, the Clean Air Act Amendments set six criteria air pollutants which are updated periodically by the National Ambient Air Quality Standards (NAAQS) and the U.S. Environmental Protection Agency (USEPA). The six criteria pollutants were identified based on scientific knowledge of health effects caused by the pollutants.
Air pollution is a particularly big problem in emerging and developing countries, where global environmental standards often cannot be met. The data in this list refers only to outdoor air quality and not indoor air quality, which caused an additional two million premature deaths in 2019. [1]
Arsenic is a naturally occurring element and can be found in food, water, or air. There are also industrial sources of arsenic, including mining and smelting. [ 8 ] " People are exposed to elevated levels of inorganic arsenic through drinking contaminated water, using contaminated water in food preparation and irrigation of food crops ...
In 2017, the biggest pollutants included carbon dioxide, nitrogen oxide, hydrocarbons, lead, and particulate matter according to Theilmann in the U.S. Clean Air Act. [5] These pollutants harm the environment as well as the citizens living in these areas. The pollutants contribute to climate change and can result in acid rain. Citizens living in ...
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