Guadalupe, Arizona Air Quality
Guadalupe has a median AQI of 71, earning an air quality grade of D — below-average air quality that ranks better than 2% of US cities. Air quality has been trending worse over the past decade, a concern for local residents and health officials. Ground-level ozone is the primary concern, typically peaking on warm sunny days due to vehicle and industrial emissions. In 2025, Guadalupe recorded 50 good air quality days (16% of monitored days) and 33 unhealthy days.
Population: 5,272 • County: Maricopa
Current AQI
Quick Facts
| Current AQI | 26 — Good |
| Air Quality Grade | D |
| Median AQI (2025) | 71 |
| vs. U.S. Cities | Better than 2% |
| Primary Pollutant | Ozone |
| Unhealthy Days/Year | 33 |
| 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 Guadalupe is sourced from the Tempe monitoring area, located approximately 4 miles from city center. This EPA-certified station continuously tracks ground-level ozone, the primary driver of air quality alerts in this area.
Guadalupe 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
Guadalupe Median AQI by Year
Annual EPA air quality data for Guadalupe — median AQI, day-category breakdown, and primary pollutant per year.
| Year | Median AQI | Good Days | Unhealthy Days | Max AQI | Primary Pollutant |
|---|---|---|---|---|---|
| 2025 | 71 | 50 | 35 | 366 | Ozone |
| 2024 | 77 | 33 | 73 | 261 | Ozone |
| 2023 | 72 | 41 | 68 | 183 | Ozone |
| 2022 | 75 | 27 | 96 | 264 | Ozone |
| 2021 | 122 | 12 | 225 | 297 | Ozone |
| 2020 | 112 | 11 | 201 | 282 | Ozone |
| 2019 | 67 | 50 | 38 | 147 | Ozone |
| 2018 | 71 | 49 | 64 | 274 | Ozone |
| 2017 | 71 | 38 | 55 | 173 | Ozone |
| 2016 | 67 | 47 | 37 | 227 | 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 Guadalupe Air Quality
What is the air quality in Guadalupe today?
The current AQI in Guadalupe is 26, 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 Guadalupe getting better or worse?
Air quality in Guadalupe has been worsening. The median AQI has risen 4 points (from 67 in 2016 to 71 in 2025), a concern for local health officials.
What is the most common air pollutant in Guadalupe?
Ozone is the primary air pollutant in Guadalupe, responsible for 190 days (63% of monitored days) in 2025. Ground-level ozone forms when sunlight reacts with emissions from vehicles and industry, typically peaking on hot summer afternoons.
How many unhealthy air days does Guadalupe have per year?
In 2025, Guadalupe recorded 16% good air quality days (50 days) out of 304 monitored days. There were 29 Unhealthy for Sensitive Groups days and 4 Unhealthy days (AQI above 100). The most severe category (Very Unhealthy or Hazardous) occurred on 2 days. The highest single-day AQI recorded was 366.
What air quality grade does Guadalupe receive?
Guadalupe receives an air quality grade of D, placing it better than 2% of US cities. This is based on a median AQI of 71 in 2025, with 50 good air quality days. The EPA monitors air quality in this area continuously using certified monitoring stations.
Air Quality Grade
Better than 2% of US cities
Nearby Cities
Protect Your Health
With a median AQI of 71, indoor air purification is recommended
See Recommended Purifiers ↓Get AQI Alerts
Receive notifications when air quality changes in Guadalupe
National Rankings
See how Guadalupe compares to every other US city by air quality.
Most Polluted Cities →All city rankingsRecommended Air Purifiers for Guadalupe
Guadalupe has a summer ozone problem — hot afternoons push AQI into Moderate or higher as sunlight converts vehicle and industrial emissions into ground-level ozone. Activated carbon and PECO filters chemically neutralize ozone rather than just trapping particles.
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