Write For Us

Air Quality: A Tale of Three Cities

E-Commerce Solutions SEO Solutions Marketing Solutions
149 Views

  • Thanks! Share it with your friends!

    You disliked this video. Thanks for the feedback!

Danielle
Published
Dr. Bryan N. Duncan is a deputy project scientist for the Aura Mission at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
He recently presented the story of air quality in three cities: Beijing, Los Angeles and Atlanta.
Instruments on NASA satellites monitor pollution around the world. One of these, The Ozone Monitoring Instrument (OMI) on the Aura satellite, has observed large amounts of sulfur dioxide, which is released when coal is burned, over Beijing.
Similarly, in the 1950s Los Angeles experienced high levels of another air pollutant—ozone. When in the higher atmosphere, ozone protects Earth from the sun's ultraviolet radiation. But closer to the ground ozone functions as a pollutant. Half a century ago in Los Angeles, levels were sometimes recorded at more than 500 ppbv. (The current National Ambient Air Quality Standard is 75 ppbv.) With the advent of catalytic converters in vehicles and other environmental policy efforts, these levels declined. But what worked to reduce ozone in Los Angeles didn’t work to reduce high ozone levels in another city: Atlanta.
In this video, Duncan talks about the dynamic nature of air quality, what causes ozone, sulfur dioxide, and nitrogen dioxide, and why reducing volatile organic carbon pollution worked to reduce ozone in Los Angeles, but not in Atlanta.
This video is public domain and can be downloaded at:
Like our videos? Subscribe to NASA's Goddard Shorts HD podcast:
Or find NASA Goddard Space Flight Center on Facebook:
Or find us on Twitter:
Be the first to comment