SmogRank / United States / Indiana / Gary
Gary, month by month
Gary has a measured daily mean on 1,255 days since 1 January 2023. Its worst month was June 2023, at 75 US AQI (22.1 µg/m³), 232nd of 1,603 cities on that month's world ranking. Its cleanest was April 2026, at 30 US AQI (5.4 µg/m³). 2025 averaged 54 US AQI (10.7 µg/m³), against 47 US AQI (8.5 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
4 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. |
| May 2026 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Mar 2026 | 19 of 31 days measured; a month needs 22. The others: 12 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.
Gary's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2023 | 7522.1 µg/m³ | 232ndof 1,603 | Eastern United States and Canada, June and July 2023 United States and Canada, June 2023 |
| July 2026 | 7120.1 µg/m³ | 331stof 2,784 | Northern United States and Canada, July 2026 |
| June 2025 | 6516.7 µg/m³ | 326thof 2,508 | Northern United States and Canada, June 2025 Northern United States and Canada, May and June 2025 |
| July 2025 | 5813.0 µg/m³ | 639thof 2,889 | North-eastern United States and Canada, 29 July to 9 August 2025 Northern United States and Canada, July 2025 |
| July 2023 | 5812.7 µg/m³ | 316thof 1,432 | United States and Canada, July 2023 North-eastern United States, 4 to 5 July 2023and 1 more |
| August 2025 | 5812.6 µg/m³ | 654thof 2,901 | North-eastern United States and Canada, 29 July to 9 August 2025 |
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.
Gary's worst days
| Day | US AQI | Episode |
|---|---|---|
| 16 Jul 2026 | 236161.0 µg/m³ | Northern United States and Canada, July 2026 |
| 17 Jul 2026 | 191113.0 µg/m³ | Northern United States and Canada, July 2026 |
| 27 Jun 2023 | 18096.8 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 28 Jun 2023 | 17690.9 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 5 Jun 2025 | 12746.0 µg/m³ | Northern United States and Canada, May and June 2025 |
| 31 Jul 2025 | 12745.9 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
| 29 Jun 2023 | 12645.8 µg/m³ | Eastern United States and Canada, June and July 2023 |
| 16 Jul 2023 | 12545.2 µg/m³ | United States and Canada, July 2023 |
| 19 Jul 2026 | 11842.5 µg/m³ | Northern United States and Canada, July 2026 |
| 1 Aug 2025 | 10637.6 µg/m³ | North-eastern United States and Canada, 29 July to 9 August 2025 |
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, Gary, 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/gary/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.
Gary 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).