Arizona landscape

Pollution in Maricopa County

Arizona Population: 4.7M Updated Jun 29, 2026
Low
Pollution

Prevalence Trend

4-week history
Jun 8 Jun 15 Jun 22 Jun 29
Low
Moderate
High
Very High
Extreme
↓ Decreasing

Summary

Pollution risk activity has stayed relatively flat over the past 12 weeks in Maricopa, Arizona. Current level is high at 2.0. The 12-week average is 32.2, and the current value is below that average. Activity has changed -97% since the peak.

Key Insights

High
6.2 (Week of Jun 8)
Low
1.4 (Week of Jun 29)
Trend
Decreasing

County Prevalence Map

Updated daily
Arizona county-level Pollution prevalence map
County-level Pollution prevalence — Arizona — Jun 29, 2026
Published by Hubbub World — health risk data for all US states and counties. Get the bub app for today's data and 30-day forecasts.

Air Pollution risk levels are derived from EPA Air Quality Index (AQI) data, including PM2.5, PM10, ozone, nitrogen dioxide, and sulfur dioxide measurements. Risk scores reflect both current conditions and forecast trends.

Data is updated hourly from EPA monitoring stations and satellite observations.

Sources: EPA AirNow, PurpleAir, satellite observations, Hubbub World air quality model

Frequently Asked Questions

What is Pollution?
Pollution risk reflects local air quality, primarily driven by fine particulate matter (PM2.5), ground-level ozone, and other common air pollutants. Higher risk levels indicate poorer air quality and a greater chance of respiratory irritation, especially for sensitive groups like people with asthma, children, and older adults.
How is Pollution risk measured in Maricopa County?
Pollution risk in Maricopa County is reported as a weekly score on a four-point scale: Low, Moderate, High, and Very High. The score reflects the modeled burden of Pollution at the county level, validated against public health data from CDC, HHS, NOAA, and other authoritative sources. Methodology details are available at https://www.hubbubworld.com/intelligence#methodology.
What methodology does Hubbub World use?
Hubbub World develops proprietary models on top of the underlying surveillance, environmental, and weather data to produce comparable risk scores across all U.S. counties. Each of the seven risks is reported on a four-point scale (Low, Moderate, High, Very High) so the scores are interpretable without needing the raw underlying numbers. The full methodology — including the modeling approach, validation against authoritative sources, and known limitations — is documented at https://www.hubbubworld.com/intelligence#methodology. The health risk data on Hubbub World is for informational purposes only and does not constitute medical advice. Always consult a healthcare professional for personal health decisions.
Where can I get current Pollution data for Maricopa County?
Current Pollution risk levels and 30-day forecasts for Maricopa County are exclusive to the bub app, available free on iOS, Android, and Apple Watch at https://bub.hubbubworld.com. This web page is the six-week historical archive — the bub app is where today's data and forecasts live.
How does Maricopa County compare to the rest of Arizona?
This page shows the six-week weekly history for Maricopa County as a heatmap. To compare Maricopa County against other counties in Arizona, visit the Arizona state page on this hub — it links to every county. For an interactive map view that compares all counties side by side, get the bub app at https://bub.hubbubworld.com.

Last updated: June 29, 2026

Data refreshed weekly

Get today's Pollution risk for Maricopa County — Download bub