Particulate Matter Forecasting will take place throughout the year.
Ozone season is March 1 - October 31. Ozone Forecasting season is April 1 - October 31.
NEW as of May 6, 2024: Smog Alerts will be activated at lower pollution levels to be more protective of public health. EPA has raised the bar for PM2.5 particle pollution by lowering the standard! (See Fact Sheet for more information).