SmogRank / United States / West Virginia / Weirton
Weirton, month by month
Weirton has a measured daily mean on 993 days since 1 January 2024. Its worst month was July 2026, at 76 US AQI (22.6 µg/m³), 261st of 2,784 cities on that month's world ranking. Its cleanest was October 2025, at 26 US AQI (4.6 µg/m³). 2025 averaged 40 US AQI (7.2 µg/m³), against 38 US AQI (6.8 µg/m³) in 2024.
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
Weirton's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 7622.6 µg/m³ | 261stof 2,784 | Northern United States and Canada, July 2026 |
| June 2025 | 5611.8 µg/m³ | 844thof 2,508 | Northern United States and Canada, June 2025 Northern United States and Canada, May and June 2025 |
| August 2025 | 529.9 µg/m³ | 1,254thof 2,901 | – |
| July 2025 | 529.8 µg/m³ | 1,310thof 2,889 | – |
| February 2026 | 519.1 µg/m³ | 1,638thof 2,866 | – |
| August 2026 | 498.9 µg/m³ | 1,219thof 2,896 | – |
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.
Weirton's worst days
| Day | US AQI | Episode |
|---|---|---|
| 17 Jul 2026 | 272197.5 µg/m³ | Northern United States and Canada, July 2026 |
| 16 Jul 2026 | 18299.6 µg/m³ | Northern United States and Canada, July 2026 |
| 18 Jul 2026 | 15662.4 µg/m³ | Northern United States and Canada, July 2026 |
| 19 Jul 2026 | 10737.9 µg/m³ | Northern United States and Canada, July 2026 |
| 7 Jun 2025 | 9432.2 µg/m³ | Northern United States and Canada, May and June 2025 |
| 8 Jun 2025 | 8628.1 µg/m³ | Northern United States and Canada, May and June 2025 |
| 13 Jun 2025 | 8225.9 µg/m³ | Northern United States and Canada, June 2025 |
| 20 Jul 2026 | 8225.6 µg/m³ | Northern United States and Canada, July 2026 |
| 8 Aug 2025 | 8024.8 µg/m³ | – |
| 5 Jun 2025 | 8024.4 µg/m³ | Northern United States and Canada, May and June 2025 |
Daily means, the highest since 1 Jan 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, Weirton, United States, 1 Jan 2024 – 10 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/weirton/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.
Weirton now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).