SmogRank / United States / Massachusetts / Uxbridge
Uxbridge, month by month
Uxbridge has a measured daily mean on 631 days since 27 December 2024. Its worst month was July 2026, at 53 US AQI (10.1 µg/m³), 1,328th of 2,784 cities on that month's world ranking. Its cleanest was October 2025, at 21 US AQI (3.8 µg/m³).
Every month since 2024
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Months without a mean, and why
1 month
| Month | Why |
|---|---|
| Dec 2024 | 5 of 31 days measured; a month needs 22. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Uxbridge's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 5310.1 µg/m³ | 1,328thof 2,784 | Northern United States and Canada, July 2026 |
| June 2025 | 519.3 µg/m³ | 1,512thof 2,508 | Northern United States and Canada, May and June 2025 |
| July 2025 | 478.5 µg/m³ | 1,644thof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 North-eastern United States and Canada, 24 to 28 July 2025 |
| August 2025 | 458.1 µg/m³ | 1,793rdof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| February 2026 | 366.5 µg/m³ | 2,340thof 2,866 | – |
| January 2026 | 325.7 µg/m³ | 2,199thof 2,617 | – |
Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.
Uxbridge's worst days
| Day | US AQI | Episode |
|---|---|---|
| 18 Jul 2026 | 11741.8 µg/m³ | Northern United States and Canada, July 2026 |
| 5 Aug 2025 | 9934.7 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 15 Jul 2026 | 8828.8 µg/m³ | Northern United States and Canada, July 2026 |
| 27 Jul 2025 | 8427.0 µg/m³ | North-eastern United States and Canada, 24 to 28 July 2025 |
| 4 Aug 2025 | 8226.0 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 9 Jun 2025 | 8125.4 µg/m³ | Northern United States and Canada, May and June 2025 |
| 26 Jul 2025 | 8125.1 µg/m³ | North-eastern United States and Canada, 24 to 28 July 2025 |
| 12 Jun 2025 | 7924.3 µg/m³ | – |
| 8 Jun 2025 | 7823.7 µg/m³ | Northern United States and Canada, May and June 2025 |
| 16 Jul 2026 | 7421.5 µg/m³ | Northern United States and Canada, July 2026 |
Daily means, the highest since 27 Dec 2024; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.
Use this history
SmogRank, PM2.5 monthly and daily means, Uxbridge, United States, 27 Dec 2024 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/uxbridge/history (accessed 12 Oct 2026).
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Uxbridge now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 18:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).