The air quality is generally acceptable for most individuals. However, sensitive groups may experience minor to moderate symptoms from long-term exposure.
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At 2,240 meters, Mexico City is well above the limit, although lots of people visit with no symptoms of sickness at all. As you go up in altitude, available oxygen for sustaining mental and physical alertness decreases. Air pressure is lower even though the percentage of oxygen in the air is essentially the same.
Over 90% of cities had good air quality on most days in 2021. Map of metro areas colored by % good air quality days. The give best are Honolulu, Hawaii (99.7%), Kahului-Wailuku-Lahaina, HI(99.7%), Lake Havasu City-Kingman, AZ (99.2%), Longview, WA (98.6%), Olympia, WA (98.5%).
Short Summary. Cancun is generally safe for travelers but take necessary precautions and take government website travel alerts into consideration. Follow safety tips like avoiding walking alone at night and sticking to well-known establishments.