IMG_20150819_085911239_HDRClark County Department of Air Quality (DAQ) extended an advisory for today through Friday, Aug. 21, for potentially elevated levels of smoke and ozone due to wildfires burning in the southern Sierra Nevada in California.  Air Quality officials say smoke is made of small dust particles and other pollutants that can aggravate respiratory diseases and contribute to ground-level ozone formation.

At this time, unhealthy levels of air pollution are not occurring. Detailed current and past information on air quality conditions is posted in the monitoring section of the DAQ website: . The DAQ website page showing the air quality forecast, advisories and alerts is located at You can receive free air quality forecasts and advisories via e-mail or text message through Enviroflash service. Subscription information is available at .