Secondary pollutants in LA smog:

• O₃ - ozone
• NO₂ - nitrogen dioxide
• particles
• PAN - peroxyacetyl nitrate
• 'These are products of reactions in the atmosphere. There are NOT directly emitted.
• The main secondary pollutant is ozone....... near the surface, it is bad for us, but up in the stratosphere, it's a good thing....

South Coast AQMD web site:  http://www.aqmd.gov/smog/index.html

• Map of L.A. Basin area and air quality data: http://www.aqmd.gov/telemweb/areamap.aspx
• Real time air quality reading in the LA Basin area: http://www.aqmd.gov/telemweb/Reading.html
• Map archive of U.S. air quality: http://airnow.gov/