EnviroNearby

Bolivar County, Mississippi air quality history

Daily Air Quality Index summaries from EPA monitors in Bolivar, Mississippi, 1999–2025.

72%
Good days in 2025
43
Median daily AQI, 2025
0
Days above 100 in 2025
359
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Bolivar, Mississippi on 359 days. 258 of those days (72%) were in the Good range, and the median daily AQI was 43. That median is about the same as the typical monitored county in Mississippi (median 43 across 10 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 246 days. Across the years with fuller monitoring, the share of Good days rose: an average of 43% in 1999–2001 versus 61% in 2023–2025.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%1999: Good 56 of 181 days1999: Moderate 82 of 181 days1999: Unhealthy for Sensitive Groups 39 of 181 days1999: Unhealthy 4 of 181 days19992000: Good 118 of 285 days2000: Moderate 127 of 285 days2000: Unhealthy for Sensitive Groups 39 of 285 days2000: Unhealthy 1 of 285 days2001: Good 157 of 280 days2001: Moderate 108 of 280 days2001: Unhealthy for Sensitive Groups 15 of 280 days20012002: Good 176 of 281 days2002: Moderate 96 of 281 days2002: Unhealthy for Sensitive Groups 9 of 281 days2003: Good 124 of 312 days2003: Moderate 179 of 312 days2003: Unhealthy for Sensitive Groups 9 of 312 days20032004: Good 126 of 355 days2004: Moderate 225 of 355 days2004: Unhealthy for Sensitive Groups 4 of 355 days2005: Good 117 of 363 days2005: Moderate 230 of 363 days2005: Unhealthy for Sensitive Groups 16 of 363 days20052006: Good 125 of 365 days2006: Moderate 218 of 365 days2006: Unhealthy for Sensitive Groups 22 of 365 days2007: Good 138 of 365 days2007: Moderate 211 of 365 days2007: Unhealthy for Sensitive Groups 16 of 365 days20072008: Good 138 of 362 days2008: Moderate 223 of 362 days2008: Unhealthy for Sensitive Groups 1 of 362 days2009: Good 165 of 340 days2009: Moderate 175 of 340 days20092010: Good 132 of 365 days2010: Moderate 227 of 365 days2010: Unhealthy for Sensitive Groups 6 of 365 days2011: Good 145 of 341 days2011: Moderate 190 of 341 days2011: Unhealthy for Sensitive Groups 6 of 341 days20112012: Good 163 of 360 days2012: Moderate 190 of 360 days2012: Unhealthy for Sensitive Groups 7 of 360 days2013: Good 208 of 245 days2013: Moderate 36 of 245 days2013: Unhealthy for Sensitive Groups 1 of 245 days20132014: Good 195 of 209 days2014: Moderate 14 of 209 days2015: Good 226 of 245 days2015: Moderate 19 of 245 days20152016: Good 222 of 244 days2016: Moderate 22 of 244 days2017: Good 221 of 235 days2017: Moderate 14 of 235 days20172018: Good 182 of 312 days2018: Moderate 128 of 312 days2018: Unhealthy for Sensitive Groups 2 of 312 days2019: Good 197 of 364 days2019: Moderate 167 of 364 days20192020: Good 233 of 363 days2020: Moderate 130 of 363 days2021: Good 236 of 360 days2021: Moderate 124 of 360 days20212022: Good 234 of 365 days2022: Moderate 131 of 365 days2023: Good 162 of 364 days2023: Moderate 198 of 364 days2023: Unhealthy for Sensitive Groups 4 of 364 days20232024: Good 243 of 366 days2024: Moderate 123 of 366 days2025: Good 258 of 359 days2025: Moderate 101 of 359 days2025
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501001501999: 90th percentile AQI 1262000: 90th percentile AQI 1082001: 90th percentile AQI 902002: 90th percentile AQI 772003: 90th percentile AQI 802004: 90th percentile AQI 742005: 90th percentile AQI 872006: 90th percentile AQI 872007: 90th percentile AQI 812008: 90th percentile AQI 712009: 90th percentile AQI 642010: 90th percentile AQI 742011: 90th percentile AQI 682012: 90th percentile AQI 712013: 90th percentile AQI 582014: 90th percentile AQI 492015: 90th percentile AQI 492016: 90th percentile AQI 502017: 90th percentile AQI 462018: 90th percentile AQI 672019: 90th percentile AQI 642020: 90th percentile AQI 602021: 90th percentile AQI 602022: 90th percentile AQI 612023: 90th percentile AQI 712024: 90th percentile AQI 582025: 90th percentile AQI 581999: Median AQI 672000: Median AQI 562001: Median AQI 492002: Median AQI 442003: Median AQI 542004: Median AQI 542005: Median AQI 562006: Median AQI 542007: Median AQI 542008: Median AQI 542009: Median AQI 512010: Median AQI 542011: Median AQI 532012: Median AQI 522013: Median AQI 412014: Median AQI 372015: Median AQI 382016: Median AQI 392017: Median AQI 362018: Median AQI 472019: Median AQI 492020: Median AQI 462021: Median AQI 442022: Median AQI 442023: Median AQI 522024: Median AQI 442025: Median AQI 4319992001200320052007200920112013201520172019202120232025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Fine particles (PM2.5)24669%
Ozone11331%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253592581010000435888PM2.5
20243662431230000445898PM2.5
202336416219840005271126PM2.5
20223652341310000446193PM2.5
20213602361240000446090PM2.5
20203632331300000466087PM2.5
20193641971670000496496PM2.5
201831218212820004767129PM2.5
2017235221140000364677Ozone
2016244222220000395093Ozone
2015245226190000384990Ozone
2014209195140000374990Ozone
20132452083610004158108Ozone
201236016319070005271129PM2.5
201134114519060005368122PM2.5
201036513222760005474147PM2.5
20093401651750000516493PM2.5
200836213822310005471105PM2.5
2007365138211160005481140PM2.5
2006365125218220005487133PM2.5
2005363117230160005687135PM2.5
200435512622540005474119PM2.5
200331212417990005480133PM2.5
20022811769690004477150Ozone
2001280157108150004990143Ozone
20002851181273910056108156Ozone
199918156823940067126187Ozone

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Mississippi with a similar median AQI in 2025

All monitored counties in Mississippi

Source: U.S. EPA AirData, “Annual AQI by County” files for 1999–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem