Southern California ozone pollution declining in recent decades

May 28, 2013

Many studies have documented the decline in ozone pollution and its precursors in the Los Angeles air basin over the past several decades.

Now Pollack et al. have analyzed new data from research aircraft, along with archived data from roadside monitors and ground-based instruments, to provide a synthesis of concentrations and emissions ratios of ozone, other secondary pollutants, and their precursors from 1960 to 2010.

The data shows that photochemical processing rates have increased and that reaction pathways have changed, reducing not only ozone but also the organic nitrate compounds associated with eye irritation.

According to the authors' analysis, these reductions are the direct result of changes in for precursors, indicating that emission in Southern California have been effective.

While emissions of precursors have declined, motor vehicles remain the dominant source of emissions in Los Angeles.

Explore further: Pollution plumes in Paris air are richer in gaseous aromatic compounds than in Los Angeles

More information: "Trends in ozone, its precursors, and related secondary oxidation products in Los Angeles, California: A synthesis of measurements from 1960 to 2010", Journal of Geophysical Research-Atmospheres, doi: 10.1002/jgrd.50472, 2013.

Related Stories

EPA proposes new ozone standards

June 21, 2007

The U.S. Environmental Protection Agency announced a proposal Thursday to strengthen the nation's air quality standard for ground-level ozone.

Recommended for you

New study finds nature is vital to beating climate change

October 16, 2017

Better stewardship of the land could have a bigger role in fighting climate change than previously thought, according to the most comprehensive assessment to date of how greenhouse gas emissions can be reduced and stored ...

Waves in lakes make waves in the Earth

October 16, 2017

Beneath the peaceful rolling waves of a lake is a rumble, imperceptible to all but seismometers, that ripples into the earth like the waves ripple along the shore.

Is it gonna blow? Measuring volcanic emissions from space

October 13, 2017

Late last month, a stratovolcano in Bali named Mount Agung began to smoke. Little earthquakes trembled beneath the mountain. Officials have since evacuated thousands of people to prevent what happened when Agung erupted in ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.