SmogRank / United States / Missouri / Springfield
Springfield, month by month
Springfield has a measured daily mean on 1,323 days since 1 January 2023. Its worst month was July 2023, at 54 US AQI (10.8 µg/m³), 563rd of 1,432 cities on that month's world ranking. Its cleanest was November 2023, at 23 US AQI (4.1 µg/m³). 2025 averaged 38 US AQI (6.9 µg/m³), against 35 US AQI (6.3 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 |
|---|---|
| Jun 2023 | 16 of 30 days measured; a month needs 21. The others: 14 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.
Springfield's worst months
| Month | US AQI | World rank |
|---|---|---|
| July 2023 | 5410.8 µg/m³ | 563rdof 1,432 |
| September 2023 | 529.8 µg/m³ | 631stof 2,176 |
| July 2026 | 529.4 µg/m³ | 1,517thof 2,784 |
| March 2023 | 519.2 µg/m³ | 326thof 911 |
| August 2023 | 509.0 µg/m³ | 777thof 1,980 |
| August 2025 | 509.0 µg/m³ | 1,483rdof 2,901 |
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.
Springfield's worst days
| Day | US AQI | Episode |
|---|---|---|
| 15 Mar 2025 | 11139.4 µg/m³ | Eastern United States, March 2025 |
| 20 Mar 2023 | 10135.7 µg/m³ | – |
| 15 Mar 2023 | 8024.6 µg/m³ | – |
| 7 Sept 2023 | 7823.4 µg/m³ | – |
| 28 Jan 2026 | 7823.4 µg/m³ | – |
| 21 Mar 2026 | 7723.0 µg/m³ | – |
| 13 Mar 2025 | 7421.2 µg/m³ | – |
| 30 Jun 2026 | 7320.9 µg/m³ | – |
| 18 Sept 2023 | 7120.1 µg/m³ | – |
| 14 Mar 2025 | 7120.0 µg/m³ | – |
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, Springfield, 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/springfield/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.
Springfield 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).