Jeff Masters: EPA warning: do not go outside in the Central U.S. dust storm! Hazardous dust covers parts of KS, OK, CO, MO, WY, IL, TX, NM, NE. The AQI in St. Louis hit an unfathomable 5,791 from PM10 (dust); an AQI over 300 is “Hazardous”. The tops: Lamar, CO hit an AQI of 12,802. Consult airnow.gov.
