SmogRank / United States / Indiana / Jasper
Jasper, month by month
Jasper has a measured daily mean on 1,171 days since 14 July 2023. Its worst month was June 2025, at 56 US AQI (11.6 µg/m³), 875th of 2,508 cities on that month's world ranking. Its cleanest was October 2025, at 30 US AQI (5.4 µg/m³). 2025 averaged 43 US AQI (7.7 µg/m³), against 43 US AQI (7.7 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
1 month
| Month | Why |
|---|---|
| Jul 2023 | 16 of 31 days measured; a month needs 22. The others: 2 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.
Jasper's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| June 2025 | 5611.6 µg/m³ | 875thof 2,508 | – |
| August 2023 | 5410.7 µg/m³ | 487thof 1,980 | – |
| August 2024 | 5310.2 µg/m³ | 583rdof 2,010 | – |
| July 2026 | 5310.2 µg/m³ | 1,303rdof 2,784 | Northern United States and Canada, July 2026 |
| July 2024 | 5310.0 µg/m³ | 733rdof 2,566 | – |
| February 2026 | 529.6 µg/m³ | 1,508thof 2,866 | – |
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.
Jasper's worst days
| Day | US AQI | Episode |
|---|---|---|
| 9 Jan 2025 | 8829.0 µg/m³ | – |
| 20 Jul 2026 | 8628.0 µg/m³ | Northern United States and Canada, July 2026 |
| 24 Aug 2023 | 8627.7 µg/m³ | – |
| 4 Jun 2025 | 8024.9 µg/m³ | – |
| 17 Jul 2023 | 7924.2 µg/m³ | – |
| 23 Aug 2023 | 7823.8 µg/m³ | – |
| 1 Aug 2025 | 7723.1 µg/m³ | – |
| 1 Jul 2026 | 7722.8 µg/m³ | – |
| 28 Jul 2023 | 7622.5 µg/m³ | – |
| 7 Sept 2023 | 7622.4 µg/m³ | – |
Daily means, the highest since 14 Jul 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, Jasper, United States, 14 Jul 2023 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/jasper/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.
Jasper 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).