California Achieves Cleaner Air Despite Having More Cars

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Despite a threefold increase in people and cars in the last 50 years, California’s strict vehicle emissions standards have managed to significantly clear the state’s air, according to new research.

The study also found that Southern California’s air chemistry has changed for the better. The amount of organic nitrates in the atmosphere — which cause smog’s eye-stinging irritation — has drastically fallen off, according to federal researchers.

Ozone and other pollutants have been monitored in the state since the 1960s. Since then the population in Southern California has tripled, as has the number of cars on the road. Nevertheless, tailpipe emissions have decreased.

The National Oceanic and Atmospheric Administration’s Cooperative Institute for Research in Environmental Sciences at the University of Colorado led the research, which analyzed decades of data and collected air samples from overflights in 2010.

The researchers credited the state’s stringent emissions standards with bringing about the pollution reductions, although they note that automobiles remain the dominant emissions source in Los Angeles.

(Referenced Article from Governing. NOT AFFILIATED WITH ECOCLTR)
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High concentrations of ozone (O3) at the Earth’s surface are generally recognized as health hazard and are a target for public policies directed at minimizing occurrence of asthma and other cardiopulmonary diseases.

So, how did automakers cut pollution in these clean vehicles? Partially, by continuing to develop their proficiency in designing emission controls. Car and light truck pollution has been evolving as automotive engineers find ways to refine their emission reductions techniques and industry leaders invent new technologies to create ever-cleaner gasoline-powered cars and trucks.

(Excerpt by Sinem Aydin)

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