SmogRank / World / North America / United States / Louisiana

Most polluted cities in Louisiana, United States

9 measured cities, last 30 days; 0 above the WHO 24-hour guideline. Worst: Shreveport at 11.4 µg/m³, #504 in the world.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

Texas: 33 measured citiesLouisiana: 9 measured citiesMississippi: 7 measured citiesAlabama: 8 measured citiesOklahoma: 10 measured citiesArkansas: 4 measured cities#9 Lafayette: 5.7 µg/m³#8 Prien: 5.9 µg/m³#7 Kenner: 6.1 µg/m³#6 Chalmette: 6.7 µg/m³#5 New Orleans: 6.8 µg/m³#4 Baton Rouge: 7.2 µg/m³#3 Schriever: 7.3 µg/m³#2 Monroe: 10.0 µg/m³#1 Shreveport: 11.4 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Shreveport 0% 0.75%0
Every measured city in Louisiana, United States, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Shreveport 0%
  2. 2Monroe 0%
  3. 3Schriever 0%
  4. 4Baton Rouge 0%
  5. 5New Orleans 0%
  6. 6Chalmettelast full day 3 Oct 0%
  7. 7Kenner 0%
  8. 8Prienlast full day 3 Oct 0%
  9. 9Lafayette 0%
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

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≈ 5 µg/m³Good
Lake Charles≈ 4 µg/m³Good
Bossier City≈ 7 µg/m³Good
Alexandria≈ 6 µg/m³Good
Houma≈ 3 µg/m³Good
Marrero≈ 5 µg/m³Good
New Iberia≈ 4 µg/m³Good
Laplace≈ 5 µg/m³Good
Central≈ 6 µg/m³Good
Slidell≈ 5 µg/m³Good
Prairieville≈ 4 µg/m³Good
Terrytown≈ 5 µg/m³Good
Ruston≈ 6 µg/m³Good
Hammond≈ 4 µg/m³Good
Harvey≈ 5 µg/m³Good
Sulphur≈ 4 µg/m³Good
Bayou Cane≈ 3 µg/m³Good
Shenandoah≈ 6 µg/m³Good
Natchitoches≈ 7 µg/m³Good
Gretna≈ 5 µg/m³Good
Opelousas≈ 4 µg/m³Good
Zachary≈ 5 µg/m³Good
Estelle≈ 5 µg/m³Good

Bad-air episodes in Louisiana

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

SmogRank, most polluted cities in Louisiana, United States, PM2.5, last 30 days to 6 Oct 2026, 23:00 UTC, smogrank.com/us/region/louisiana?w=30d.

Download top 10 (PNG)

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.

Updated 2026-10-06 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.