Bad air day: https://airnow.gov/index.cfm?action=airnow.mapsarchivedetail&domainid=53&mapdate=20160210&tab=1
Salt Lake City's AirNow: https://airnow.gov/index.cfm?action=airnow.local_city&cityid=186
I guess better than 5 years ago: http://www.ksl.com/?nid=148&sid=9300491
YouTube: https://www.youtube.com/watch?v=vUHlxBZMiqw
YouTube: https://www.youtube.com/watch?v=HfEYNXWo5l8
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