Some apps run on data crowdsourced from relatively affordable air quality sensors sold by companies such as PurpleAir and IQAir. Air quality apps and mapsOutdoor air quality-monitoring apps like AirNow, AirCare and AirVisual have been among the nation's most used apps in past years when wildfires raged in Oregon and California. Like most air pollution trackers, it uses a color-coded visual system to indicate whether air pollution levels are good to hazardous, or whether there is not enough data to issue a rating. These include a Fire and Smoke Map, which provides information on fire locations, smoke plumes and air quality, and the AirNow Interactive Map shows ozone and particulate matter from air quality monitors across the country. Indoor air matters, tooWhile outdoor air quality is important, society doesn't talk or do enough about indoor air quality, said Richard Corsi, University of California, Davis' incoming dean of the college of engineering, currently a professor and dean at Portland State University.

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Persons: AirNow, Yanelli Nunez, Anna Kioumourtzoglou, Nunez, Richard Corsi, Davis, Corsi Organizations: CNBC, U.S . Environmental Protection Agency, ZIP, Apple Watch, Huawei, Columbia University's Mailman, of Public Health, University of California, Portland State University Locations: North America, Europe, Quebec, Ontario, U.S, New York City, Oregon, California, Mexico, Canada, Macedonia, Australia, Swiss, Greater Los Angeles