Air Quality Rankings for Mississippi (2026)
Mississippi has 10 cities tracked by EPA air-quality monitors, with a state-wide 5-year median AQI of 44 — 3 points more polluted than the national average of AQI 41. Yalobusha, Mississippi ranks #1 with the cleanest air (AQI 33, Grade B), while Hinds, Mississippi sits at the bottom (AQI 53, Grade C).
How Mississippi Compares
Mississippi has 10 cities tracked by EPA air-quality monitors, with a state-wide 5-year median AQI of 44 — 3 points more polluted than the national average of AQI 41. Yalobusha, Mississippi ranks #1 with the cleanest air (AQI 33, Grade B), while Hinds, Mississippi sits at the bottom (AQI 53, Grade C). The rankings below are computed from the EPA Air Quality System (AQS), which aggregates daily AQI readings from federally certified monitors into annual averages. Cities are sorted by 5-year median AQI (lowest = cleanest = #1). The 5-year window smooths out year-to-year volatility from weather and wildfire events.
Mississippi is bucking the national trend of broad improvement: 8 of 10 monitored cities show measurably worse air over the past decade, more than the 1 that are improving. Across western states this usually traces back to expanding wildfire smoke exposure; elsewhere it can reflect rising local emissions from population or freight growth.
The dominant pollutant across 7 of 10 Mississippi cities is Fine Particulate Matter (PM2.5). PM2.5 (fine particulate matter) is most often driven by combustion sources — vehicle exhaust, industrial emissions, residential wood burning, and increasingly wildfire smoke. It penetrates deep into lung tissue and the bloodstream and is the air pollutant most strongly linked to long-term health impacts. Other Mississippi cities report Ground-Level Ozone (3) as their dominant concern.
The fastest-improving city in Mississippi is Hinds, Mississippi, with median AQI falling by 0.2 points per year. Steady improvement at that pace usually reflects fleet turnover (older diesels retiring), upwind power-plant retirements, or tighter regional emissions controls.
The city with the steepest decline is Jackson, Mississippi, where median AQI is rising by 1.8 points per year. Rapid deterioration in a single city usually points to either wildfire-smoke exposure (in the West) or a new local emissions source — a power plant, port, or freight corridor coming online.
Full Mississippi Ranking
| # | City | 5yr Avg AQI | Current AQI | Worst Pollutant | Trend | Grade |
|---|---|---|---|---|---|---|
| 1 | Yalobusha, Mississippi | 33 | 36 | Ozone | Stable | B |
| 2 | Lauderdale, Mississippi | 34 | 38 | Ozone | Stable | B |
| 3 | Lee, Mississippi | 38 | 42 | Ozone | Worsening | C |
| 4 | Hancock, Mississippi | 45 | 50 | PM2.5 | Worsening | C |
| 5 | Jackson, Mississippi | 46 | 51 | PM2.5 | Worsening | D |
| 6 | Bolivar, Mississippi | 47 | 52 | PM2.5 | Worsening | C |
| 7 | DeSoto, Mississippi | 48 | 54 | PM2.5 | Stable | C |
| 8 | Harrison, Mississippi | 48 | 51 | PM2.5 | Stable | C |
| 9 | Forrest, Mississippi | 50 | 53 | PM2.5 | Stable | C |
| 10 | Hinds, Mississippi | 53 | 54 | PM2.5 | Stable | C |
Air quality data for Mississippi is sourced from the EPA Air Quality System (AQS), which monitors outdoor air quality at thousands of stations nationwide.
Frequently Asked Questions
Yalobusha, Mississippi has the best air quality in Mississippi with a 5-year average AQI of 33 and a Grade B (67/100). Its dominant pollutant is Ground-Level Ozone and the long-run trend is stable.
Hinds, Mississippi has the worst air quality in Mississippi with a 5-year average AQI of 53 and a Grade C (60/100). Its dominant pollutant is Fine Particulate Matter (PM2.5).
Mississippi has 10 cities with EPA air quality monitoring data, covering 2014-2023 of daily AQI measurements aggregated into annual averages.
Mississippi's state-wide 5-year median AQI is 44, 3 points more polluted than the national average of AQI 41. Mississippi is bucking the national trend of broad improvement: 8 of 10 monitored cities show measurably worse air over the past decade, more than the 1 that are improving. Across western states this usually traces back to expanding wildfire smoke exposure; elsewhere it can reflect rising local emissions from population or freight growth.
Fine Particulate Matter (PM2.5) is the dominant pollutant in 7 of 10 monitored Mississippi cities. PM2.5 (fine particulate matter) is most often driven by combustion sources — vehicle exhaust, industrial emissions, residential wood burning, and increasingly wildfire smoke. It penetrates deep into lung tissue and the bloodstream and is the air pollutant most strongly linked to long-term health impacts.
Mississippi cities log an average of 1 days per year at "Unhealthy for Sensitive Groups" or worse, based on EPA monitor data over the last five years. Across all 10 Mississippi cities tracked, that totals 37 unhealthy days over the period.
Cities ranked by 5-year average AQI (lower is better). Grades factor in average AQI, trend direction, unhealthy days, and dominant pollutant.
The this entity category groups every U.S. air quality and pollution monitoring entity sharing this attribute. The list above is the data; the paragraphs below explain what the grouping means against the broader the EPA Air Quality System (AQS) distribution and how to read the relative rankings within the category.
For readers using this category as a starting point, the per-entity detail pages linked from the table above carry the underlying the EPA Air Quality System (AQS) data in full. The category-level view is the filter; the per-entity pages are the actual answer.
Source: EPA Outdoor Air Quality Data, 2026.