Tucson Air Quality in 2019
In 2019, Tucson's air quality (Tucson, AZ area) had a median daily AQI of 49 (Good) across 365 monitored days. 2 days (0.5%) reached Unhealthy for Sensitive Groups or worse, 207 were Good, and the year's peak AQI was 103 (Unhealthy for Sensitive Groups). Ground-level ozone set the daily AQI on 237 of those days. The cleanest month of 2019 was January (median AQI 40, 0 days above 100) and the worst was June (median 57, 1 day above 100, peak 103).
- Good: 56.7%
- Moderate: 42.7%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
Extra Protection for Tucson Homes
Air quality in Tucson is moderate (AQI 52), with fine particles (PM2.5) the main concern. A True-HEPA purifier gives sensitive groups — kids, seniors and anyone with asthma or allergies — cleaner air indoors on days like today.
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How was Tucson's air quality in 2019?
Good on a typical day: median AQI 49, with 2 days above AQI 100 out of 365 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 103 (Unhealthy for Sensitive Groups).
- ✓Ground-level ozone was the main pollutant on 237 days.
- ✓Cleanest month: January; worst: June.
Frequently asked questions
What was the average AQI in Tucson in 2019?▾
EPA's Air Quality System puts Tucson's (Tucson, AZ) median daily AQI for 2019 at 49, which is Good. 2 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 103.
Which month had the worst air quality in Tucson in 2019?▾
The cleanest month of 2019 was January (median AQI 40, 0 days above 100) and the worst was June (median 57, 1 day above 100, peak 103).
Was 2019 a good or bad year for Tucson's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2019's median of 49 is below the area's typical annual median of 54.
Tucson month by month in 2019
Tucson air quality month by month, 2019 (Tucson, AZ, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| Januarycleanest | 31 | 40 | 0 | 53 | PM2.5 |
| February | 28 | 44 | 0 | 51 | O3 |
| March | 31 | 48 | 0 | 84 | O3 |
| April | 30 | 54 | 0 | 89 | O3 |
| May | 31 | 58 | 0 | 87 | O3 |
| Juneworst | 30 | 57 | 1 | 103 | O3 |
| July | 31 | 55 | 1 | 101 | O3 |
| August | 31 | 54 | 0 | 93 | O3 |
| September | 30 | 43 | 0 | 86 | O3 |
| October | 31 | 47 | 0 | 66 | PM10 |
| November | 30 | 44 | 0 | 56 | PM10 |
| December | 31 | 42 | 0 | 68 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2019's median of 49 is below the area's typical annual median of 54.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Tucson
The latest EPA AirNow observation puts Tucson's AQI at 52 (PM2.5). The figures above are multi-year annual statistics, not today's reading.
View current Tucson air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Tucson, AZ), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.