SmogRank / World / North America / United States / Mississippi

Most polluted cities in Mississippi, United States

7 measured cities, this year; 7 above the WHO annual guideline. Worst: Jackson at 9.1 µg/m³, #1,291 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.

Louisiana: 9 measured citiesMississippi: 7 measured citiesAlabama: 9 measured citiesFlorida: 36 measured citiesArkansas: 4 measured citiesTennessee: 14 measured cities#7 Pascagoula: 7.4 µg/m³#5 Gulfport: 7.8 µg/m³#6 Waveland: 7.8 µg/m³#4 Cleveland: 8.2 µg/m³#3 Hernando: 8.3 µg/m³#2 Hattiesburg: 8.7 µg/m³#1 Jackson: 9.1 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Jackson 0% 0.75%0
Every measured city in Mississippi, 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. 1Jackson 0%
  2. 2Hattiesburg 0%
  3. 3Hernando 0%
  4. 4Cleveland 0%
  5. 5Gulfport 0%
  6. 5Waveland 0%
  7. 7Pascagoula 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

Mississippi 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
West Gulfport≈ 6 µg/m³Good
Southaven≈ 7 µg/m³Good
Biloxi≈ 4 µg/m³Good
Meridian≈ 5 µg/m³Good
Olive Branch≈ 7 µg/m³Good
Tupelo≈ 6 µg/m³Good
Greenville≈ 6 µg/m³Good
Horn Lake≈ 7 µg/m³Good
Pearl≈ 6 µg/m³Good
Madison≈ 7 µg/m³Good
Starkville≈ 7 µg/m³Good
Clinton≈ 6 µg/m³Good
Ridgeland≈ 7 µg/m³Good
Brandon≈ 6 µg/m³Good
Columbus≈ 8 µg/m³Good
Vicksburg≈ 5 µg/m³Good
Oxford≈ 5 µg/m³Good
Laurel≈ 12 µg/m³Moderate
Gautier≈ 4 µg/m³Good
Ocean Springs≈ 4 µg/m³Good
Clarksdale≈ 7 µg/m³Good
Long Beach≈ 5 µg/m³Good
Greenwood≈ 8 µg/m³Good
Natchez≈ 5 µg/m³Good

Bad-air episodes in Mississippi

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 Mississippi, United States, PM2.5, this year to 6 Oct 2026, 23:00 UTC, smogrank.com/us/region/mississippi?w=year.

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.