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Jun 19, 2024 · Despite numerous environmental laws being enacted over the decades, pollution remains a major issue in the United States. Everyday human-made activities like manufacturing processes ...
- Release of Chemicals to Water Bodies
Average annual PM2.5 air pollution concentrations in the...
- Release of Chemicals to Water Bodies
- Air Pollution Challenges: Common Pollutants
- Air Pollution Challenges: Climate Change
- Air Pollution Challenges: Toxic Pollutants
- Air Pollution Challenges: Protecting The Stratospheric Ozone Layer
Great progress has been made in achieving national air quality standards, which EPA originally established in 1971 and updates periodically based on the latest science. One sign of this progress is that visible air pollution is less frequent and widespread than it was in the 1970s. However, air pollution can be harmful even when it is not visible. ...
EPA determined in 2009 that emissions of carbon dioxide and other long-lived greenhouse gases that build up in the atmosphere endanger the health and welfare of current and future generations by causing climate change and ocean acidification. Long-lived greenhouse gases, which trap heat in the atmosphere, include carbon dioxide, methane, nitrous ox...
While overall emissions of air toxics have declined significantly since 1990, substantial quantities of toxic pollutants continue to be released into the air. Elevated risks can occur in urban areas, near industrial facilities, and in areas with high transportation emissions.
The ozone (O3) layer in the stratosphere protects life on earth by filtering out harmful ultraviolet radiation (UV) from the sun. When chlorofluorocarbons (CFCs) and other ozone-degrading chemicalsare emitted, they mix with the atmosphere and eventually rise to the stratosphere. There, the chlorine and the bromine they contain initiate chemical rea...
Apr 24, 2024 · Nearly 40% of people in the U.S. are living in areas with unhealthy levels of air pollution and the country is backsliding on clean air progress as the effects of climate change intensify ...
- Science Reporter
- 6 min
Apr 21, 2022 · Despite decades of environmental efforts, over 40% of Americans — more than 137 million people — live in cities and states with poor air quality, a new report says. And, in addition to cars ...
For more than 50 years, the U.S. Environmental Protection Agency (EPA) has maintained its commitment to protecting public health by reducing pollutant emissions and improving air quality. This annual report, titled Our Nation's Air, summarizes the nation's air quality status and trends through 2021. Sections of this report convey information ...
For more than 50 years, the U.S. Environmental Protection Agency (EPA) has maintained its commitment to protecting public health by reducing pollutant emissions and improving air quality. This annual report, titled Our Nation's Air, summarizes the nation's air quality status and trends through 2020. Sections of this report convey information ...
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Jul 31, 2020 · Here, we provide early evidence. We combine 36 years of PM 2.5 concentrations measured over ~8.6 million grid cells with geographic, economic, and demographic data from ~65,000 U.S. census tracts. We show that differences in PM 2.5 between more and less polluted areas declined substantially between 1981 and 2016.
