Air quality · Mississippi
Air quality in Mississippi
Across the 3 Mississippi ZIPs with EPA county air-quality data, the median day ranges from Good to Moderate (median AQI 43–52). No day in those counties reached Unhealthy in 2025. This is a 2025 county annual summary, not a live reading.
Last verified 2026-09-24 · methodology
Air quality by ZIP code in Mississippi
EPA's 2025 annual summary for each ZIP's county. Median AQI is the typical day; lower is cleaner.
| ZIP | Median AQI | Good days | Unhealthy or worse |
|---|---|---|---|
| 39201JacksonHinds County | 52 Moderate | 167 of 365 | 0 |
| 39501GulfportHarrison County | 43 Good | 252 of 365 | 0 |
| 38655Oxford (MS)Lafayette County | No data | ||
| 39530Biloxi (MS)Harrison County | 43 Good | 252 of 365 | 0 |
County-level figures from EPA Air Quality System (AQS), annual county summary, joined to each ZIP by county. None of them is a measurement at a specific address.
What lands here
Pages show the 2025 median AQI category (Good, Moderate, Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy, Hazardous) for the ZIP's county, plus the year's max/90th-percentile AQI and day-count breakdown by category.
Source & refresh
EPA Air Quality System (AQS), annual county summary. Refreshed annual (epa aqs publication). Primary source →
Mississippi top concern
Hurricanes, tornadoes, rural water compliance
Mississippi's Gulf Coast carries FEMA VE/AE zones. Jackson's water-system crisis (2022) flagged severe EPA SDWIS compliance issues; many small rural systems statewide face similar oversight pressure. Tornado risk peaks April.
See Mississippi state page for the full state-level rollup across all 12 dimensions.
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