SmogRank / World / United States / Arizona / 2026

Most polluted cities in Arizona, United States, 2026

16 cities in Arizona, United States ranked by their average PM2.5 so far (278 of 365 days); 12 above the WHO annual guideline (5.0 µg/m³). Worst: Nogales at 8.4 µg/m³, #1,621 of 2,745 cities in the world. Cleanest: Green Valley at 3.2. A city needs measurements on 70% of the days to be ranked.

About 6.8K people in these 3 cities breathed unhealthy air on an average day of 2026.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

← Phoenix 5.94K 5K0
Every city in Arizona, United States ranked for 2026 with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Phoenix
    5.94K
  2. 2Glendale
    864
  3. 3Casas Adobes
    0
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, 2026 · All cities in United States, 2026 · Arizona now

Use this board

SmogRank, most polluted cities in Arizona, United States, PM2.5, 2026 (so far), smogrank.com/us/region/arizona/history/2026 (accessed 6 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.