SmogRank / United States / Pennsylvania / Monessen
Monessen, month by month
Monessen has a measured daily mean on 1,310 days since 1 January 2023. Its worst month was June 2023, at 87 US AQI (28.3 µg/m³), 120th of 1,603 cities on that month's world ranking. Its cleanest was May 2024, at 14 US AQI (2.6 µg/m³). 2025 averaged 39 US AQI (7.1 µg/m³), against 39 US AQI (7.0 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
2 months
| Month | Why |
|---|---|
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Monessen's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 8728.3 µg/m³ | 120thof 1,603 | Eastern United States and Canada, June and July 2023 United States and Canada, June 2023and 1 more |
| July 2026 | 6717.9 µg/m³ | 395thof 2,784 | Northern United States and Canada, July 2026 |
| July 2023 | 5913.2 µg/m³ | 268thof 1,432 | United States and Canada, July 2023 Eastern United States and Canada, June and July 2023 |
| January 2023 | 5712.4 µg/m³ | 329thof 1,261 | – |
| June 2024 | 5712.1 µg/m³ | 343rdof 2,563 | – |
| May 2023 | 5410.7 µg/m³ | 383rdof 1,600 | Eastern United States and Canada, May and June 2023 |
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.
Monessen's worst days
| Day | US AQI | Episode |
|---|---|---|
| 17 Jul 2026 | 238163.0 µg/m³ | Northern United States and Canada, July 2026 |
| 29 Jun 2023 | 207132.0 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 28 Jun 2023 | 194117.0 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 16 Jul 2026 | 15561.9 µg/m³ | Northern United States and Canada, July 2026 |
| 18 Jul 2026 | 14653.7 µg/m³ | Northern United States and Canada, July 2026 |
| 30 Jun 2023 | 14051.5 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 17 Jul 2023 | 11440.8 µg/m³ | United States and Canada, July 2023 |
| 6 Jun 2023 | 11139.5 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 17 Jun 2023 | 10637.7 µg/m³ | United States and Canada, June 2023 |
| 7 Jun 2023 | 10637.5 µg/m³ | Eastern United States and Canada, May and June 2023 |
Daily means, the highest since 1 Jan 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, Monessen, United States, 1 Jan 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/monessen/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.
Monessen 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).