pollution of the atmosphere
"air pollution reduced the visibility"
The contamination of the atmosphere by noxious gases and particulates.
Air pollution is the introduction into the atmosphere of chemicals, particulates, or biological materials that cause discomfort, disease, or death to humans, damage other living organisms such as food crops, or damage the natural environment or built environment. The atmosphere is a complex dynamic natural gaseous system that is essential to support life on planet Earth. Stratospheric ozone depletion due to air pollution has long been recognized as a threat to human health as well as to the Earth's ecosystems. Indoor air pollution and urban air quality are listed as two of the World’s Worst Toxic Pollution Problems in the 2008 Blacksmith Institute World's Worst Polluted Places report.
U.S. National Library of Medicine
The presence of contaminants or pollutant substances in the air (AIR POLLUTANTS) that interfere with human health or welfare, or produce other harmful environmental effects. The substances may include GASES; PARTICULATE MATTER; or volatile ORGANIC CHEMICALS.
The numerical value of air pollution in Chaldean Numerology is: 3
The numerical value of air pollution in Pythagorean Numerology is: 9
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"air pollution." Definitions.net. STANDS4 LLC, 2017. Web. 19 Nov. 2017. <http://www.definitions.net/definition/air pollution>.