North American Air Pollution Statistics

About the Air Quality Levels

AQI	Air Pollution Level	Health Implications	Cautionary Statement (for PM2.5)
0 - 50	Good	Air quality is considered satisfactory, and air pollution poses little or no risk	None
51 -100	Moderate	Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.	Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
101-150	Unhealthy for Sensitive Groups	Members of sensitive groups may experience health effects. The general public is not likely to be affected.	Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
151-200	Unhealthy	Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects	Active children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion
201-300	Very Unhealthy	Health warnings of emergency conditions. The entire population is more likely to be affected.	Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit outdoor exertion.
300+	Hazardous	Health alert: everyone may experience more serious health effects	Everyone should avoid all outdoor exertion

To know more about Air Quality and Pollution, check the wikipedia Air Quality topic or the airnow guide to Air Quality and Your Health.

For very useful health advices of Beijing Doctor Richard Saint Cyr MD, check www.myhealthbeijing.com blog.

Worst
	Mexicali-Cobach, Mexicali, California, California on 2018-12-16 19:00:00 graph 0	177
	Nogales Post Office, Arizona, USA on 2018-12-16 19:00:00 graph 1	164
	Jerome Mack, Clark County, USA on 2018-12-16 17:00:00 graph 2	160
	West Phoenix, Maricopa, USA on 2018-12-16 19:00:00 graph 3	156
	Burns, Oregon, USA on 2018-12-16 18:00:00 graph 4	154
	Yosemite Village - Visitor Center, Mariposa, California, California on 2018-12-16 19:00:00 graph 5	132
	Mira Loma-Van Buren, Riverside, California, California on 2018-12-16 19:00:00 graph 6	131
	FNSB RAMS, Alaska, USA on 2018-12-16 19:00:00 graph 7	123
	South Valley, New Mexico, USA on 2018-12-16 18:00:00 graph 8	121
	Brownsville, Harlingen, Texas, Texas on 2018-12-16 18:00:00 graph 9	117

Best
	Clovis-N Villa Avenue, Fresno, California, California on 2018-12-16 18:00:00 graph 0	1
	Natural Bridge Station, Rockbridge County, USA on 2018-12-16 17:00:00 graph 1	1
	Heritage Middle School, San Antonio, Texas, Texas on 2018-12-16 19:00:00 graph 2	1
	South Phoenix, Maricopa, USA on 2018-12-16 17:00:00 graph 3	1
	Buffalo Viewpoint, Alberta, Canada on 2018-12-16 16:00:00 graph 4	2
	Hanford-S Irwin Street, Kings, California, California on 2018-12-16 16:00:00 graph 5	2
	Plummer, Idaho, USA on 2018-12-16 19:00:00 graph 6	2
	East St. Louis, Illinois, USA on 2018-12-16 18:00:00 graph 7	2
	Rock_is, Illinois, USA on 2018-12-16 13:00:00 graph 8	3
	Daytona - Blind Services, Volusia, Florida, USA on 2018-12-16 19:00:00 graph 9	3

Top 10 Best and Worst Air Quality in North America