6/6/2013

Scientists have analyzed air quality data gathered from the Los Angeles metropolitan area and found a dramatic decrease in the concentration of air pollutants between 1960 and 2010. Some of the most significant declines in the region include an annual 9.3% drop in peroxyacetyl nitrate levels, a 7.3% drop per year in ozone precursors and a 2.6% decrease per year in nitrogen oxides. The study found that regulations on vehicle emissions made the largest impact, even as the population and gasoline sales tripled during that time.

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