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: Obama says 'no greater threat to planet than climate change'

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

Jun 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

China's struggle for water security

16 hours ago

Way back in 1999, before he became China's prime minister, Wen Jiabao warned that water scarcity posed one of the greatest threats to the "survival of the nation".

Canada revises upward CO2 emission data since 1990

16 hours ago

Canada revised its greenhouse gas emission data from 1990 to 2013 in a report Friday, showing it had higher carbon dioxide discharges each year, and a doubling of emissions from its oil sands.

Climate censorship gains steam in red states

Apr 17, 2015

While plenty of people found humor in the recent news that officials in Florida and Wisconsin are censoring state workers' ability to talk about, much less work on, climate change, other states are not necessarily laughing. ...

User comments : 0

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.