SmogRank / Countries / United States / Louisiana

Most polluted cities in Louisiana, United States

8 measured cities ranked by PM2.5, last 7 days. Worst: Monroe at 11.7 µg/m³, #381 in the world.

#City µg/m³
1Monroe Louisiana
11.7
2Shreveport Louisiana
11.5
3Baton Rouge Louisiana
9.4
4New Orleans Louisiana
9.4
5Chalmette Louisiana
9.1
6Kenner Louisiana
8.9
7Sulphur Louisiana
8.3
8Lafayette Louisiana
7.8
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data

Estimated: cities without a monitor

Louisiana cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Metairie estimated≈ 9 µg/m³Moderate
Lake Charles estimated≈ 7 µg/m³Good
Bossier City estimated≈ 11 µg/m³Moderate
Alexandria estimated≈ 8 µg/m³Good
Houma estimated≈ 7 µg/m³Good
Marrero estimated≈ 9 µg/m³Moderate
New Iberia estimated≈ 7 µg/m³Good
Laplace estimated≈ 10 µg/m³Moderate
Central estimated≈ 12 µg/m³Moderate
Slidell estimated≈ 8 µg/m³Good
Prairieville estimated≈ 10 µg/m³Moderate
Terrytown estimated≈ 9 µg/m³Moderate
Ruston estimated≈ 9 µg/m³Good
Hammond estimated≈ 8 µg/m³Good
Harvey estimated≈ 9 µg/m³Moderate
Bayou Cane estimated≈ 7 µg/m³Good
Shenandoah estimated≈ 12 µg/m³Moderate
Natchitoches estimated≈ 12 µg/m³Moderate
Gretna estimated≈ 9 µg/m³Moderate
Opelousas estimated≈ 8 µg/m³Good
Zachary estimated≈ 8 µg/m³Good
Estelle estimated≈ 9 µg/m³Moderate

Updated 2026-10-01 09:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.