[EBH]

Hmmm....

http://www.wunderground.com/US/Region/Southwest/AirQuality.html

[cyn]

Surely you're not saying they're (gasp) lying!!??

[Drago]

Hmmm.... http://www.wunderground.com/US/Region/Southwest/AirQuality.html

Weather Underground only reports ozone pollution at your link...ozone pollution is primarilly a summer problem (Sun/Temp. acting on NOx/VOC's).  The winter pollution problem is primarilly "PM 2.5" (smoke)(particles around 2.5 microns in dia.) in inversion areas (especially the central valley of Calif.).

http://www.wisegeek.com/what-is-ozone-pollution.htm

http://www.valleyair.org/aqinfo/forecast.htm