Worcester Air Quality in June
Across 2019–2025, Worcester's June air quality had a median AQI of 49 (Good) over 210 monitored days in the Worcester, MA-CT area. 1.9% of June days (4 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 50.5% of days. The cleanest June on record here was 2019 (median AQI 46, 0 days above 100) and the worst was 2024 (median 44, 2 days above 100, peak AQI 122).
- Good: 53.8%
- Moderate: 44.3%
- Unhealthy for Sensitive Groups: 1.9%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Worcester
Today's main pollutant in Worcester is ground-level ozone (AQI 32). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How is the air in Worcester in June?
Good on a typical day: median AQI 49 across 2019–2025, with 1.9% of June days above AQI 100. Ground-level ozone is the main driver.
- ✓53.8% of June days were Good (AQI 0–50), 44.3% Moderate (51–100).
- ✓4 days of 210 reached AQI 101+; the June peak was 148.
- ✓Best June: 2019; worst June: 2024.
Frequently asked questions
What is the air quality like in Worcester in June?▾
Across 2019–2025, the median daily AQI in Worcester in June was 49 (Good). 53.8% of days were Good, 44.3% Moderate, and 1.9% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is June a good time for outdoor exercise in Worcester?▾
A typical June day in Worcester sits in the Good range (median AQI 49), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 53 of June days (1.9%) reached AQI 101+ in 2019–2025.
Which pollutant causes Worcester's June air quality problems?▾
Ground-level ozone set the daily AQI on 50.5% of June days in Worcester. The highest June AQI recorded in 2019–2025 was 148 (Unhealthy for Sensitive Groups), in 2024.
Worcester June air quality, year by year
Worcester June air quality by year (Worcester, MA-CT, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 30 | 46 | 0 | 84 | PM2.5 |
| 2020 | 30 | 47 | 0 | 87 | O3 |
| 2021 | 30 | 55 | 1 | 140 | PM2.5 |
| 2022 | 30 | 51 | 0 | 71 | PM2.5 |
| 2023 | 30 | 48 | 1 | 148 | O3 |
| 2024worst | 30 | 44 | 2 | 122 | O3 |
| 2025 | 30 | 47 | 0 | 100 | O3 |
What June air means in Worcester
A typical June day in Worcester sits in the Good range (median AQI 49), so running, cycling and children's outdoor play are fine for everyone on most days; about 1 day in 53 of June days (1.9%) reached AQI 101+ in 2019–2025.
June's median AQI of 49 is above Worcester's whole-year median of 43, making it one of the area's dirtier periods. Nationally, the median June AQI across every EPA metro area (100,635 metro-days, 2019–2025) is 46, so Worcester runs in line with the national June norm; 1.9% of its June days topped AQI 100 versus 3.7% nationally (below average).
June is part of Worcester's summer season (June, July, August); the summer page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Worcester
The latest EPA AirNow observation puts Worcester's AQI at 32 (O3). The figures above are multi-year month statistics, not today's reading.
View current Worcester air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Worcester, MA-CT), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.