Despite a lot more people and cars, California's air is cleaner

June 11, 2013 by Julie Cart

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, have decreased.

The 's Cooperative Institute for Research in Environmental Sciences at the University of Colorado led the research, which analyzed decades of data and collected from overflights in 2010.

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

Explore further: Southern California ozone pollution declining in recent decades

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