Newsweek - Thousands of people are at risk for "emergency" health conditions in Southern California on Friday, with officials issuing alerts across two counties amid hazardous air quality levels... The maroon-level air quality index (AQI) category—covering values 301 and higher—means the air is so unhealthy, it creates a "health warning of emergency conditions" and that "everyone" can be affected, according to the AQI Basics webpage from the U.S. Environmental Protection Agency (EPA).
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