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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]
Air pollution from this source has been reported in England since the Middle Ages. [7] [8] London, in particular, was notorious up through the mid-20th century for its coal-caused smogs, which were nicknamed "pea-soupers". Air pollution of this type is still a problem in areas that generate significant smoke from burning coal.
Greenhouse gas emissions in 2019 were estimated at 57.4 GtCO 2 e, while CO 2 emissions alone made up 42.5 Gt including land-use change (LUC). [94] While mitigation measures for decarbonization are essential on the longer term, they could result in weak near-term warming because sources of carbon emissions often also co-emit air pollution.
Other dangerous pollutants include gases like nitrogen dioxide or sulfur dioxide, which are also produced from burning fuels, said Anumita Roychowdhury, an air pollution expert at the Center for Science and Environment in New Delhi. The sources and intensity of air pollution varies in different cities and seasons.
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.
Various definitions of pollution exist, which may or may not recognize certain types, such as noise pollution or greenhouse gases.The United States Environmental Protection Administration defines pollution as "Any substances in water, soil, or air that degrade the natural quality of the environment, offend the senses of sight, taste, or smell, or cause a health hazard.
Air pollution is not created by just one thing. Natural factors like wind patterns, temperature, and humidity can cause air pollution. Anthropogenic activities like transportation and industrial ...
These greenhouse gases in the atmosphere constitute the "air pollution" that threatens both public health and welfare. 2) The Cause or Contribute Finding, in which the Administrator found that the combined greenhouse gas emissions from new motor vehicles and motor vehicle engines contribute to the atmospheric concentrations of these key ...