Corona de Tucson, Arizona Air Quality
Corona de Tucson has a median AQI of 55, earning an air quality grade of B — good air quality that ranks better than 4% of US cities. Air quality has been trending worse over the past decade, a concern for local residents and health officials. Particulate matter (PM10) is the primary concern, often linked to vehicle traffic, industrial activity, and wildfire smoke. In 2025, Corona de Tucson recorded 101 good air quality days (37% of monitored days) and 5 unhealthy days.
Population: 9,566 • County: Pima
Current AQI
Quick Facts
| Current AQI | 11 — Good |
| Air Quality Grade | B |
| Median AQI (2025) | 55 |
| vs. U.S. Cities | Better than 4% |
| Primary Pollutant | PM10 |
| Unhealthy Days/Year | 5 |
| 10-Year Trend | ↓ Worsening |
| Data Source | EPA AQS (historical) · AirNow (live) |
Health Recommendation
Air quality is satisfactory, and air pollution poses little or no risk.
It's a great day to be active outside!
5-Day AQI Forecast
Last 90 Days
Current Pollutant Levels
Real-time data from EPA AirNow
Local Air Quality Context
Air quality data for Corona de Tucson is sourced from the Corona de Tucson monitoring area, located approximately 4 miles from city center. This EPA-certified station continuously tracks particulate matter (PM10), the primary driver of air quality alerts in this area.
Corona de Tucson typically sees its worst air quality during summer afternoons when heat and sunlight drive ground-level ozone formation from vehicle and industrial emissions. Morning readings are generally 15–25 points lower than afternoon peaks. Outdoor activity is best planned for early morning on high-ozone days.
AQI Trend (10 Years)
Air Quality Days by Year
Corona de Tucson Median AQI by Year
Annual EPA air quality data for Corona de Tucson — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 55 | 101 | 7 | 357 | PM10 |
| 2024 | 56 | 113 | 12 | 171 | Ozone |
| 2023 | 54 | 123 | 7 | 147 | Ozone |
| 2022 | 53 | 147 | 13 | 142 | Ozone |
| 2021 | 56 | 93 | 14 | 313 | Ozone |
| 2020 | 55 | 124 | 13 | 277 | Ozone |
| 2019 | 49 | 207 | 2 | 103 | Ozone |
| 2018 | 52 | 164 | 11 | 129 | Ozone |
| 2017 | 54 | 121 | 7 | 122 | Ozone |
| 2016 | 50 | 191 | 4 | 119 | Ozone |
Source: EPA Air Quality System (AQS) annual summaries. "Unhealthy Days" includes Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, and Hazardous categories.
2025 Air Quality Summary
Primary Pollutant Days (2025)
Days when each pollutant was the primary driver of AQI. Learn about pollutants →
Frequently Asked Questions About Corona de Tucson Air Quality
What is the air quality in Corona de Tucson today?
The current AQI in Corona de Tucson is 11, rated "Good". Air quality is good — outdoor activity is safe for everyone today. Air quality is satisfactory, and air pollution poses little or no risk.
Is air quality in Corona de Tucson getting better or worse?
Air quality in Corona de Tucson has been worsening. The median AQI has risen 5 points (from 50 in 2016 to 55 in 2025), a concern for local health officials.
What is the most common air pollutant in Corona de Tucson?
PM10 is the primary air pollutant in Corona de Tucson, responsible for 127 days (47% of monitored days) in 2025. Particulate matter originates from vehicle exhaust, wildfires, construction, and industrial activity.
How many unhealthy air days does Corona de Tucson have per year?
In 2025, Corona de Tucson recorded 37% good air quality days (101 days) out of 273 monitored days. There were 2 Unhealthy for Sensitive Groups days and 3 Unhealthy days (AQI above 100). The most severe category (Very Unhealthy or Hazardous) occurred on 2 days. The highest single-day AQI recorded was 357.
What air quality grade does Corona de Tucson receive?
Corona de Tucson receives an air quality grade of B, placing it better than 4% of US cities. This is based on a median AQI of 55 in 2025, with 101 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 4% of US cities
Nearby Cities
Protect Your Health
With a median AQI of 55, indoor air purification is recommended
See Recommended Purifiers ↓Get AQI Alerts
Receive notifications when air quality changes in Corona de Tucson
National Rankings
See how Corona de Tucson compares to every other US city by air quality.
Best Air Quality Cities →All city rankingsRecommended Air Purifiers for Corona de Tucson
Corona de Tucson's primary pollutant is PM10 (coarse dust and pollen). Units with a washable pre-filter stage plus True HEPA handle the larger particles that drive most of this area's air quality days.
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