SmogRank / United States / Illinois / Elgin
Elgin, month by month
Elgin has a measured daily mean on 719 days since 10 October 2024. Its worst month was July 2026, at 91 US AQI (30.8 µg/m³), 130th of 2,784 cities on that month's world ranking. Its cleanest was April 2026, at 33 US AQI (6.0 µg/m³).
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
Elgin's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| July 2026 | 9130.8 µg/m³ | 130thof 2,784 | Northern United States and Canada, July 2026 |
| June 2025 | 6214.9 µg/m³ | 452ndof 2,508 | Northern United States and Canada, June 2025 Northern United States and Canada, May and June 2025 |
| July 2025 | 6114.4 µg/m³ | 460thof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 Northern United States, July 2025and 1 more |
| August 2025 | 5812.8 µg/m³ | 606thof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
| February 2026 | 5511.3 µg/m³ | 1,131stof 2,866 | North-eastern United States and Canada, 14 to 19 February 2026 |
| August 2026 | 5511.1 µg/m³ | 677thof 2,896 | – |
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.
Elgin's worst days
| Day | US AQI | Episode |
|---|---|---|
| 16 Jul 2026 | 400275.0 µg/m³ | Northern United States and Canada, July 2026 |
| 17 Jul 2026 | 217142.0 µg/m³ | Northern United States and Canada, July 2026 |
| 19 Jul 2026 | 16677.3 µg/m³ | Northern United States and Canada, July 2026 |
| 31 Jul 2025 | 16473.7 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 20 Jul 2026 | 15459.7 µg/m³ | Northern United States and Canada, July 2026 |
| 1 Aug 2025 | 13649.8 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 5 Jun 2025 | 13047.4 µg/m³ | Northern United States and Canada, May and June 2025 |
| 3 Aug 2025 | 11039.0 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 18 Jul 2026 | 10537.1 µg/m³ | Northern United States and Canada, July 2026 |
| 21 Jul 2025 | 9935.0 µg/m³ | Northern United States, July 2025 |
Daily means, the highest since 10 Oct 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, Elgin, United States, 10 Oct 2024 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/elgin/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.
Elgin now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 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).