San Tan Valley, Arizona Air Quality
San Tan Valley has a median AQI of 66, earning an air quality grade of C — moderate air quality that ranks better than 2% of US cities. Air quality has remained relatively stable over the past decade. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, San Tan Valley recorded 66 good air quality days (25% of monitored days) and 20 unhealthy days.
Population: 109,189 • County: Pinal
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Quick Facts
| Current AQI | 51 — Moderate |
| Air Quality Grade | C |
| Median AQI (2025) | 66 |
| vs. U.S. Cities | Better than 2% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 20 |
| 10-Year Trend | → Stable |
| Data Source | EPA AirNow |
Health Recommendation
Air quality is acceptable. However, there may be a risk for some people who are unusually sensitive to air pollution.
Unusually sensitive people should consider reducing prolonged or heavy outdoor exertion.
5-Day AQI Forecast
Last 30 Days
Current Pollutant Levels
Real-time data from EPA AirNow
AQI Trend (10 Years)
Air Quality Days by Year
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 San Tan Valley Air Quality
What is the air quality in San Tan Valley today?
The current AQI in San Tan Valley is 51, which is rated "Moderate". Air quality is acceptable. However, there may be a risk for some people who are unusually sensitive to air pollution.
Is air quality in San Tan Valley getting better or worse?
Air quality in San Tan Valley has remained relatively stable over the past decade, with a median AQI of around 66.
What is the most common air pollutant in San Tan Valley?
Ozone is the primary air pollutant in San Tan Valley, responsible for the most air quality-impacted days in 2025. Ground-level ozone forms when sunlight reacts with vehicle and industrial emissions on warm days.
How many unhealthy air days does San Tan Valley have per year?
In 2025, San Tan Valley had 20 days when air quality was unhealthy or unhealthy for sensitive groups (AQI above 100). There were 66 good days and 178 moderate days out of 268 days monitored.
What air quality grade does San Tan Valley receive?
San Tan Valley receives an air quality grade of C, placing it better than 2% of US cities. This grade is based on a median AQI of 66 for 2025, derived from EPA monitoring data.
Air Quality Grade
Better than 2% of US cities
Nearby Cities
Protect Your Health
With a median AQI of 66, indoor air purification is recommended
See Recommended Purifiers ↓Get AQI Alerts
Receive notifications when air quality changes in San Tan Valley
National Rankings
See how San Tan Valley compares to every other US city by air quality.
Most Polluted Cities →All city rankingsRecommended Air Purifiers for San Tan Valley
Based on your area's air quality (median AQI: 66), we recommend these air purifiers to help protect your health indoors.
Honeywell HPA300
Powerful workhorse for large rooms. Built to last.
- ✓Perfect room size match
- ✓Recommended for your air quality
- ✓Has 1/3 desired features
- ✓High performance
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Other Great Options
Blueair Blue Pure 211+
High performance for large rooms with simple operation.
Dyson Pure Cool TP04
Premium all-in-one air purifier and fan with advanced features.
Molekule Air Pro
Commercial-grade with patented PECO technology for destroying pollutants.
Not sure which air purifier is right for you?
Learn more about different types of air purifiers and how to choose the best one for your needs.
Read our complete buying guide →