SmogRank / United States / Illinois / Evanston
Evanston, month by month
Evanston has a measured daily mean on 163 days since 20 January 2026. Its worst month was February 2026, at 60 US AQI (14.1 µg/m³), 848th of 2,866 cities on that month's world ranking. Its cleanest was September 2026, at 44 US AQI (7.9 µg/m³).
Every month since 2026
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
6 months
| Month | Why |
|---|---|
| Aug 2026 | 16 of 31 days measured; a month needs 22. The others: 15 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 | 7 of 30 days measured; a month needs 21. The others: 23 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | 14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | 10 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 8 of 31 days measured; a month needs 22. The others: 4 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.
Evanston's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2026 | 6014.1 µg/m³ | 848thof 2,866 | North-eastern United States and Canada, 14 to 19 February 2026 |
| March 2026 | 5410.7 µg/m³ | 1,483rdof 2,971 | North-eastern United States and Canada, March 2026 |
| September 2026 | 447.9 µg/m³ | 1,020thof 2,981 | – |
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.
Evanston's worst days
| Day | US AQI | Episode |
|---|---|---|
| 16 Jul 2026 | 302226.0 µg/m³ | – |
| 15 Feb 2026 | 9030.1 µg/m³ | North-eastern United States and Canada, 14 to 19 February 2026 |
| 5 Feb 2026 | 8426.8 µg/m³ | – |
| 4 Mar 2026 | 8125.1 µg/m³ | North-eastern United States and Canada, March 2026 |
| 16 Feb 2026 | 7823.5 µg/m³ | North-eastern United States and Canada, 14 to 19 February 2026 |
| 9 Feb 2026 | 7722.8 µg/m³ | – |
| 18 Jul 2026 | 7622.3 µg/m³ | – |
| 19 Mar 2026 | 7522.1 µg/m³ | – |
| 2 Feb 2026 | 7421.2 µg/m³ | – |
| 10 Feb 2026 | 7321.0 µg/m³ | – |
Daily means, the highest since 20 Jan 2026; 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, Evanston, United States, 20 Jan 2026 – 11 Oct 2026. Monitor data from AirGradient and Clarity via OpenAQ; sources listed at smogrank.com/sources. smogrank.com/us/evanston/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.
Evanston 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).