SmogRank / United States / Illinois / Champaign
Champaign, month by month
Champaign has a measured daily mean on 903 days since 2 April 2024. Its worst month was July 2026, at 59 US AQI (13.5 µg/m³), 654th of 2,784 cities on that month's world ranking. Its cleanest was April 2024, at 28 US AQI (5.0 µg/m³). 2025 averaged 43 US AQI (7.8 µg/m³), against 38 US AQI (6.9 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
Months without a mean, and why
1 month
| Month | Why |
|---|---|
| Oct 2026 | 3 of 11 days measured; a month needs 8. The others: 6 with no readings from the monitor, 2 with readings for part of the day (a day needs 18 hours). |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Champaign's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 5913.5 µg/m³ | 654thof 2,784 | Northern United States and Canada, July 2026 |
| June 2025 | 5913.2 µg/m³ | 641stof 2,508 | Northern United States and Canada, June 2025 Northern United States and Canada, May and June 2025 |
| July 2025 | 519.3 µg/m³ | 1,449thof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| August 2026 | 519.1 µg/m³ | 1,155thof 2,896 | – |
| August 2025 | 509.0 µg/m³ | 1,483rdof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| August 2024 | 498.8 µg/m³ | 929thof 2,010 | – |
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.
Champaign's worst days
| Day | US AQI | Episode |
|---|---|---|
| 19 Jul 2026 | 15763.9 µg/m³ | Northern United States and Canada, July 2026 |
| 15 Mar 2025 | 13750.0 µg/m³ | Eastern United States, March 2025 |
| 1 Aug 2025 | 13649.6 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 20 Jul 2026 | 12645.8 µg/m³ | Northern United States and Canada, July 2026 |
| 12 Jun 2025 | 9733.8 µg/m³ | Northern United States and Canada, June 2025 |
| 6 Jun 2025 | 9231.3 µg/m³ | Northern United States and Canada, May and June 2025 |
| 31 Jul 2025 | 8828.9 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 7 Jun 2025 | 8226.0 µg/m³ | Northern United States and Canada, May and June 2025 |
| 8 Jun 2025 | 7722.9 µg/m³ | Northern United States and Canada, May and June 2025 |
| 30 Jun 2026 | 7622.4 µg/m³ | – |
Daily means, the highest since 2 Apr 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, Champaign, United States, 2 Apr 2024 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/champaign/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.
Champaign 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).