Air quality[ change change source ] Pollution can be gas or liquid or solid. It can also be classified chemically, such as: Pollution can also be classified by what makes it. Many pollutants go into the air from natural sources.
EPA is currently reviewing the adequacy of the ozone and PM 10 standards. Largely in response to a court decision in favor of environmentalists Sierra Club v. Ruckelshaus, the amendments included a program for the prevention of significant deterioration PSD of air that was already clean.
This program would prevent polluting the air up to the national levels in areas where the air was cleaner than the standards.
In Class I areas, areas with near pristine air quality, no new significant air pollution would be allowed. Class I areas are airsheds over larger national parks and wilderness areas. In Class II areas a moderate degree of air quality deterioration would be allowed.
And finally, in Class III areas, air deterioration up to the national secondary standards would be allowed. Related to the prevention of significant deterioration is a provision to protect and enhance visibility in national parks and wilderness areas even if the air pollution is not a threat to human health.
The impetus of this section of the bill was the growing visibility problem in parks, especially in the Southwest. Throughout the s efforts to further amend the Clean Air Act were stymied.
President Ronald Reagan was opposed to any strengthening of the Act, which he argued would hurt the economy. In Congress, the controversy over acid rain between members from the Midwest and the Northeast further contributed to the stalemate.
Over the next two years, the issues were hammered out between environmentalists and industry and between different regions of the country.
Major amendments to the Clean Air Act were finally passed in the fall of These amendments addressed four major topics: Most of this reduction came from old utility power plants.
The law also creates marketable pollution allowances, so that a utility that reduces emissions more than required can sell those pollution rights to another source.
Economists argue that such an approach should become more widespread for all pollution control, to Courtesy of U. Due to the failure of the toxic air pollutant provisions of the Clean Air Act, new, more stringent provisions were adopted requiring regulations for all major sources of varieties of toxic air pollution within 10 years.
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Areas of the country still in nonattainment for criteria pollutants will be given from three to 20 years to meet these standards.
These areas are also required to impose tighter controls to meet these standards. To help these areas and other parts of the country, the act requires stiffer motor vehicle emissions standards and cleaner gasoline.
Finally, three chemical families that contribute to the destruction of the stratospheric ozone layer chlorofluorocarbons [CFCs], hydrochlorofluorocarbons [HCFCs], and methyl chloroform are to be phased out of production and use. The Clean Air Act has met with mixed success. The national average pollutant levels for the criteria pollutants have decreased.
Nevertheless, many localities have not achieved these standards and are in perpetual nonattainment. Not surprisingly, major urban areas are those most frequently in nonattainment. The pollutant for which standards are most often exceeded is ozone, or smog. A final point of caution concerning evaluating the Clean Air Act: These changes may be due to shifts in the economy at large, changes in weather patterns, or other such variables.
In those cases where topography is a factor in air movement, AQCRs often correspond with airsheds.
AQCRs may consist of two or more cities, counties, or other governmental entities, and each region is required to adopt consistent pollution control measures across the political jurisdictions involved. AQCRs may even cross state lines and, in these instances, the states must cooperate in developing pollution control strategies.
As ofmost AQCRs had achieved national air quality standards; however the remaining AQCRs where standards had not been achieved were a significant group, where a large percentage of the United States population dwelled. AQCRs involving major metro areas like Los Angeles, New York, Houston, Denver, and Philadelphia were not achieving air quality standards because of smog, motor vehicle emissions, and other pollutants.
OZONE Ozone O 3 is a toxic, colorless gas but can be blue when in high concentration with a characteristic acrid odor. A variant of normal oxygen, it has three oxygen atoms per molecule rather than the usual two.
Ozone strongly absorbs ultraviolet radiation at wavelengths of — nanometers nm with peak absorption at The effects of air pollution. Pollutants from vehicle exhaust can affect more than just your lungs.
Indeed, tailpipe pollutants pose health risks at every stage of life, and can even cause premature death. But the impacts of climate change, driven by global warming emissions, also affect people's health and the well-being of entire communities. An air pollutant is a material in the air that can have adverse effects on humans and the ecosystem.
The substance can be solid particles, liquid droplets, or gases. In fact air pollution is the occurrence or addition of foreign particles, gases and other pollutants into the air which have an adverse effect on .
industrial practices that have caused pollution of the air and water The tests showed high levels of pollution in the water.
The fish are dying of pollution. A look at the metro areas with the most health-damaging air pollution, according to a report from the American Lung Association. Air pollution is a general term that covers a broad range of contaminants in the atmosphere.
Pollution can occur from natural causes or from human activities.