SmogRank / United States / Ohio / Columbus
Columbus, month by month
Columbus has a measured daily mean on 1,119 days since 6 September 2023. Its worst month was July 2026, at 71 US AQI (19.6 µg/m³), 349th of 2,784 cities on that month's world ranking. Its cleanest was May 2026, at 34 US AQI (6.1 µg/m³). 2025 averaged 52 US AQI (9.6 µg/m³), against 52 US AQI (9.6 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
Columbus's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 7119.6 µg/m³ | 349thof 2,784 | Northern United States and Canada, July 2026 North-eastern United States, June and July 2026 |
| October 2024 | 6214.9 µg/m³ | 258thof 2,020 | – |
| June 2025 | 6114.3 µg/m³ | 513thof 2,508 | Northern United States and Canada, June 2025 Northern United States and Canada, May and June 2025 |
| July 2025 | 5611.9 µg/m³ | 859thof 2,889 | – |
| November 2023 | 5611.8 µg/m³ | 323rdof 2,243 | Eastern United States and Canada, November 2023 |
| February 2026 | 5611.8 µg/m³ | 1,048thof 2,866 | – |
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.
Columbus's worst days
| Day | US AQI | Episode |
|---|---|---|
| 17 Jul 2026 | 258183.5 µg/m³ | Northern United States and Canada, July 2026 |
| 19 Jul 2026 | 10938.6 µg/m³ | Northern United States and Canada, July 2026 |
| 20 Jul 2026 | 10135.6 µg/m³ | Northern United States and Canada, July 2026 |
| 4 Jun 2025 | 9633.5 µg/m³ | Northern United States and Canada, May and June 2025 |
| 19 Oct 2024 | 9633.2 µg/m³ | – |
| 8 Jun 2025 | 9633.2 µg/m³ | Northern United States and Canada, May and June 2025 |
| 20 Oct 2024 | 9633.0 µg/m³ | – |
| 16 Jul 2026 | 9030.3 µg/m³ | Northern United States and Canada, July 2026 |
| 18 Oct 2024 | 8828.8 µg/m³ | – |
| 7 Jun 2025 | 8728.5 µg/m³ | Northern United States and Canada, May and June 2025 |
Daily means, the highest since 6 Sept 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, Columbus, United States, 6 Sep 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/columbus/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.
Columbus 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).