SmogRank / United States / Louisiana / Prien
Prien, month by month
Prien has a measured daily mean on 1,295 days since 1 January 2023. Its worst month was May 2023, at 60 US AQI (13.9 µg/m³), 172nd of 1,600 cities on that month's world ranking. Its cleanest was January 2025, at 32 US AQI (5.7 µg/m³). 2025 averaged 43 US AQI (7.8 µg/m³), against 51 US AQI (9.1 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
3 months
| Month | Why |
|---|---|
| Mar 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 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 2 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive, 1 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.
Prien's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| May 2023 | 6013.9 µg/m³ | 172ndof 1,600 | Southern United States, May 2023 |
| August 2023 | 5913.2 µg/m³ | 263rdof 1,980 | – |
| December 2023 | 5812.8 µg/m³ | 374thof 2,247 | – |
| February 2024 | 5712.2 µg/m³ | 457thof 2,486 | – |
| July 2023 | 5712.1 µg/m³ | 391stof 1,432 | – |
| June 2023 | 5611.7 µg/m³ | 574thof 1,603 | – |
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.
Prien's worst days
| Day | US AQI | Episode |
|---|---|---|
| 9 May 2024 | 10738.0 µg/m³ | Southern United States and Mexico, 7 to 10 May 2024 |
| 23 Aug 2023 | 10336.4 µg/m³ | – |
| 10 Oct 2024 | 10235.8 µg/m³ | – |
| 29 Nov 2023 | 9432.0 µg/m³ | – |
| 27 May 2024 | 9231.1 µg/m³ | Southern United States and Mexico, 19 to 28 May 2024 |
| 23 May 2023 | 8829.0 µg/m³ | Southern United States, May 2023 |
| 3 Dec 2024 | 8829.0 µg/m³ | – |
| 19 Feb 2024 | 8728.2 µg/m³ | – |
| 20 Feb 2024 | 8527.6 µg/m³ | – |
| 31 Dec 2025 | 8527.4 µg/m³ | Texas and Louisiana, United States, December 2025 to January 2026 |
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, Prien, 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/prien/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.
Prien now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).