Urban air pollution in the U.S. In the event you liked this article and you would like to receive more information with regards to and pneumatic connectors and Hoses. Our assortment base is growing every day. We have the largest selection and cross-section of the leading brands on the market. To meet the expectations of retail customers - http://community.swnews4u.com/blogs/detail/52664 - generously visit our web-site. has been decreasing near continuously since the 1970s.

Federal regulations, notably the Clean Air Act passed by President Nixon, to reduce toxic air pollutants such as benzene, a hydrocarbon, and ozone, a strong oxidant, effectively lowered their abundance in ambient air with steady progress.

But about 10 years ago, the picture on air pollutants in the U.S. started to change. 

The 'fracking boom' in several different parts of the nation led to a new source of hydrocarbons to the atmosphere, affecting abundances of both toxic benzene and ozone, including in areas that were not previously affected much by such air pollution.

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Tanker trucks, capable of hauling water and hydraulic fracturing liquid, line up near a natural gas burn off flame and storage tanks in Williston, North Dakota. Fracking has led to an increase in truck traffic, one of the reasons for worsening air quality in areas with oil and gas drilling