Montgomery County’s median daily air quality index by month (0 to 50 is good, over 100 is unhealthy for sensitive groups).
Median daily AQI: 46 in April 2026. Change from March 2026: +16.7%. From a year earlier: +7.1%.
Next update: May 2026 figures, expected around Dec 17, 2026.
What this means
The Median daily AQI figure, 46, was 7.1% higher than in April 2025 (43).
How Median AQI compares
| Median daily AQI | 46 | |
|---|---|---|
| Days over 100 | 0 |
| April 2026 | April 2025 | Change | |
|---|---|---|---|
| Median daily AQI | 46 | 43 | +7.1% |
| Days over 100 | 0 | 0 | −NaN% |
Common questions
What is the latest figure for air quality index in Median AQI?
Median daily AQI: 46 in April 2026, from the U.S. Environmental Protection Agency.
How has the figure for air quality index in Median AQI changed over the past year?
It was 46 in April 2026, against 43 in April 2025 (+7.1%).
How often is the figure for air quality index updated?
Monthly, from the U.S. Environmental Protection Agency. Next update: May 2026 figures, expected around Dec 17, 2026.
Related data
About this data
EPA's daily air quality index for Montgomery County, the highest of the day's pollutant readings (usually ozone or fine particles) across the county's monitors. Each month shows the median day and the number of days over 100, the level EPA calls unhealthy for sensitive groups. EPA publishes these certified files twice a year, so the latest months run well behind; months with fewer than 20 reported days are left out.
Source: U.S. Environmental Protection Agency, AirData daily AQI by county. Updated November 5, 2026, monthly. Download the data (CSV).