SmogRank / United States / Pennsylvania / Uniontown
Uniontown, month by month
Uniontown has a measured daily mean on 1,147 days since 29 July 2023. Its worst month was July 2026, at 70 US AQI (19.3 µg/m³), 362nd of 2,784 cities on that month's world ranking. Its cleanest was May 2024, at 19 US AQI (3.5 µg/m³). 2025 averaged 37 US AQI (6.7 µg/m³), against 34 US AQI (6.2 µg/m³) in 2024.
Every month since 2023
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 |
|---|---|
| Jul 2023 | 3 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.
Uniontown's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 7019.3 µg/m³ | 362ndof 2,784 | Northern United States and Canada, July 2026 |
| June 2025 | 5410.6 µg/m³ | 1,118thof 2,508 | Northern United States and Canada, June 2025 Northern United States and Canada, May and June 2025 |
| July 2025 | 529.9 µg/m³ | 1,283rdof 2,889 | – |
| August 2023 | 529.5 µg/m³ | 701stof 1,980 | – |
| August 2024 | 498.8 µg/m³ | 929thof 2,010 | – |
| August 2025 | 488.7 µg/m³ | 1,578thof 2,901 | – |
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.
Uniontown's worst days
| Day | US AQI | Episode |
|---|---|---|
| 17 Jul 2026 | 268193.0 µg/m³ | Northern United States and Canada, July 2026 |
| 18 Jul 2026 | 12645.7 µg/m³ | Northern United States and Canada, July 2026 |
| 16 Jul 2026 | 10737.9 µg/m³ | Northern United States and Canada, July 2026 |
| 22 Mar 2024 | 8929.7 µg/m³ | – |
| 19 Jul 2026 | 8829.2 µg/m³ | Northern United States and Canada, July 2026 |
| 5 Jun 2025 | 8225.6 µg/m³ | Northern United States and Canada, May and June 2025 |
| 13 Jun 2025 | 8225.6 µg/m³ | Northern United States and Canada, June 2025 |
| 20 Jul 2026 | 8125.3 µg/m³ | Northern United States and Canada, July 2026 |
| 2 Jul 2026 | 7823.6 µg/m³ | – |
| 8 Aug 2025 | 7723.1 µg/m³ | – |
Daily means, the highest since 29 Jul 2023; 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, Uniontown, United States, 29 Jul 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/uniontown/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.
Uniontown now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 19:07 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).