SmogRank / United States / Indiana / Columbus
Columbus, month by month
Columbus, Indiana has a measured daily mean on 1,126 days since 1 January 2023. Its worst month was June 2023, at 73 US AQI (21.0 µg/m³), 255th of 1,603 cities on that month's world ranking. Its cleanest was October 2025, at 24 US AQI (4.3 µg/m³). 2025 averaged 40 US AQI (7.2 µg/m³), against 38 US AQI (6.8 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
8 months
| Month | Why |
|---|---|
| Oct 2026 | 7 of 11 days measured; a month needs 8. The others: 2 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 12 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | 8 of 30 days measured; a month needs 21. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Mar 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | 10 of 28 days measured; a month needs 20. The others: 18 with under 18 hours of readings or readings that failed our checks. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Columbus's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 7321.0 µg/m³ | 255thof 1,603 | Eastern United States and Canada, June and July 2023 Eastern United States and Canada, May and June 2023 |
| June 2025 | 5511.1 µg/m³ | 990thof 2,508 | – |
| July 2025 | 5410.9 µg/m³ | 1,070thof 2,889 | – |
| August 2023 | 5410.6 µg/m³ | 509thof 1,980 | – |
| July 2023 | 529.6 µg/m³ | 700thof 1,432 | Eastern United States and Canada, June and July 2023 |
| February 2024 | 498.8 µg/m³ | 889thof 2,486 | – |
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 |
|---|---|---|
| 28 Jun 2023 | 216141.0 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 29 Jun 2023 | 14252.0 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 27 Jun 2023 | 13247.9 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 6 Jun 2023 | 10135.5 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 19 Jul 2026 | 9231.1 µg/m³ | Northern United States and Canada, July 2026 |
| 20 Jul 2026 | 8929.6 µg/m³ | Northern United States and Canada, July 2026 |
| 8 Jun 2023 | 8326.4 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 7 Jun 2023 | 8125.3 µg/m³ | Eastern United States and Canada, May and June 2023 |
| 5 Jul 2025 | 8024.9 µg/m³ | – |
| 1 Aug 2025 | 7823.8 µg/m³ | – |
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, Columbus, Indiana, 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/columbus-indiana/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 23:07 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).