SmogRank / United States / Louisiana / Monroe

Monroe, month by month

Monroe has a measured daily mean on 265 days since 9 January 2026. Its worst month was February 2026, at 56 US AQI (12.0 µg/m³), 1,022nd of 2,866 cities on that month's world ranking. Its cleanest was May 2026, at 39 US AQI (7.1 µg/m³).

Every month since 2026

202651 so far265 days measured1,212th of 2,791 in the world
Jan44#1,526Feb56#1,022Mar48#1,980Apr43#1,691May39#1,585Jun43#1,146Jul53#1,280Aug56#585Sep53#636Oct49#781
Each square is a month's mean PM2.5 in US AQI from Monroe's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Monroe marked; each year, the year's. A dashed square is the running month, so far.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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

Monroe's worst months

MonthUS AQIDays measuredWorld rank
February 2026 5612.0 µg/m³28 of 281,022ndof 2,866
August 2026 5611.8 µg/m³30 of 31585thof 2,896
July 2026 5310.3 µg/m³26 of 311,280thof 2,784
September 2026 5310.2 µg/m³29 of 30636thof 2,981
March 2026 488.6 µg/m³31 of 311,980thof 2,971
January 2026 447.9 µg/m³23 of 311,526thof 2,617

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.

Monroe's worst days

DayUS AQI
2 Feb 2026 9231.1 µg/m³
14 Aug 2026 8829.0 µg/m³
8 Feb 2026 7823.7 µg/m³
28 Jan 2026 7722.9 µg/m³
10 Feb 2026 6818.4 µg/m³
28 Feb 2026 6818.2 µg/m³
11 Feb 2026 6717.9 µg/m³
19 Jul 2026 6717.8 µg/m³
1 Mar 2026 6617.4 µg/m³
19 Feb 2026 6617.0 µg/m³

Daily means, the highest since 9 Jan 2026; 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, Monroe, United States, 9 Jan 2026 – 11 Oct 2026. Monitor data from AirNow, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/us/monroe/history (accessed 12 Oct 2026).

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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.

Monroe 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).