U.S. Air Quality

PM 2.5 and Ozone levels stay at moderate levels

Air quality today mostly stayed in the Code Yellow (Moderate) levels today, with most of the PM 2.5 seen being located in the Great Lakes region, the Rocky Mountain states, and the Pacific Southwest (AirNow, top left). PM 2.5 levels did, however, rise to Code Red levels (Unsafe) on the border between Idaho and Montana, most likely due to wildfires and smoke in this area, as seen in NOAA,s HMS map, top right. Ozone levels were also relatively low, with only some Code Yellow and Code Orange (Unsafe for Sensitive Groups) being seen in the Pacific Southwest (weather.gov, bottom left). This rise in ozone was somewhat due to high temperatures in this area, with the temperatures rising to the high ninety degrees throughout the day (weather.gov, bottom right).