SmogRank / United States / Kansas / Topeka
Topeka, month by month
Topeka has a measured daily mean on 1,336 days since 1 January 2023. Its worst month was September 2023, at 63 US AQI (15.4 µg/m³), 168th of 2,176 cities on that month's world ranking. Its cleanest was October 2023, at 33 US AQI (5.9 µg/m³). 2025 averaged 48 US AQI (8.6 µg/m³), against 45 US AQI (8.1 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 2024 | 14 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive, 16 with under 18 hours of readings or readings that failed our checks. |
| Jan 2023 | 18 of 31 days measured; a month needs 22. The others: 7 missing from OpenAQ's archive, 6 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.
Topeka's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| September 2023 | 6315.4 µg/m³ | 168thof 2,176 | Northern United States, September 2023 Northern United States and Canada, August and September 2023 |
| July 2026 | 5712.3 µg/m³ | 843rdof 2,784 | Northern United States, July 2026 |
| June 2023 | 5612.0 µg/m³ | 550thof 1,603 | – |
| August 2025 | 5611.9 µg/m³ | 789thof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| March 2026 | 5511.4 µg/m³ | 1,340thof 2,971 | – |
| April 2023 | 5511.0 µg/m³ | 320thof 1,622 | – |
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.
Topeka's worst days
| Day | US AQI | Episode |
|---|---|---|
| 7 Sept 2023 | 16372.4 µg/m³ | Northern United States and Canada, August and September 2023 |
| 6 Sept 2023 | 16271.8 µg/m³ | Northern United States and Canada, August and September 2023 |
| 1 Aug 2025 | 15662.0 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 16 Apr 2025 | 13248.1 µg/m³ | – |
| 14 May 2024 | 12846.3 µg/m³ | Northern United States and Canada, May 2024 |
| 2 Aug 2025 | 11641.5 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 14 Mar 2025 | 11440.6 µg/m³ | United States and Mexico, March 2025 |
| 5 Jul 2026 | 10938.8 µg/m³ | Northern United States, July 2026 |
| 8 Apr 2026 | 9834.3 µg/m³ | – |
| 24 Jan 2023 | 9834.2 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, Topeka, 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/topeka/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.
Topeka 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).