The worst air pollution cities in the USA & Canada
Listed in order of highest particulate matter concentration
| Rank | City | Pollution Index | 1st Person Discount |
| 1 | Phoenix, AZ, United States | 62.49 | |
| 2 | Los Angeles, CA, United States | 61.38 | Not Available |
| 3 | New York, NY, United States | 58.74 | |
| 4 | Salt Lake City, UT, United States | 56.97 | |
| 5 | Houston, TX, United States | 55.54 | |
| 6 | Detroit, MI, United States | 53.2 | |
| 7 | San Jose, CA, United States | 51.87 | |
| 8 | Atlanta, GA, United States | 50.31 | |
| 9 | Las Vegas, NV, United States | 49.68 | |
| 10 | Winnipeg, Canada | 45.56 | |
| 11 | Dallas, TX, United States | 44.87 | |
| 12 | Sacramento, CA, United States | 42.78 | |
| 13 | Pittsburgh, PA, United States | 41.63 | |
| 14 | Honolulu, HI, United States | 40.91 | |
| 15 | Toronto, Canada | 40.68 | |
| 16 | Miami, FL, United States | 40.53 | |
| 17 | Denver, CO, United States | 39.91 | |
| 18 | Orlando, FL, United States | 39.1 | |
| 19 | San Antonio, TX, United States | 38.79 | |
| 20 | Indianapolis, IN, United States | 38.65 | |
| 21 | San Francisco, CA, United States | 37.38 | |
| 22 | Washington, DC, United States | 36.93 | |
| 23 | Austin, TX, United States | 36.93 | |
| 24 | Chicago, IL, United States | 36.71 | |
| 25 | Brampton, Canada | 35.48 | |
| 26 | Montreal, Canada | 33.28 | |
| 27 | San Diego, CA, United States | 32.16 | |
| 28 | Nashville, TN, United States | 31.24 | |
| 29 | Seattle, WA, United States | 30.38 | |
| 30 | Richmond, VA, United States | 30.11 | |
| 31 | Reno, NV, United States | 29.05 | |
| 32 | Edmonton, Canada | 27.49 | |
| 33 | Charlotte, NC, United States | 27.32 | |
| 34 | Tampa, FL, United States | 26.15 | |
| 35 | Calgary, Canada | 26 | |
| 36 | Columbus, OH, United States | 25.79 | |
| 37 | Vancouver, Canada | 24.41 | |
| 38 | Portland, OR, United States | 23.74 | |
| 39 | Boston, MA, United States | 23.04 | |
| 40 | Mississauga, Canada | 22.86 | |
| 41 | Minneapolis, MN, United States | 18.29 | |
| 42 | Victoria, Canada | 15.88 |