EnviroNearby

Yalobusha County, Mississippi air quality history

Daily Air Quality Index summaries from EPA monitors in Yalobusha, Mississippi, 1990–2025.

97%
Good days in 2025
34
Median daily AQI, 2025
0
Days above 100 in 2025
354
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Yalobusha, Mississippi on 354 days. 342 of those days (97%) were in the Good range, and the median daily AQI was 34. That median is lower than the typical monitored county in Mississippi (median 43 across 10 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 354 days. Across the years with fuller monitoring, the share of Good days rose: an average of 76% in 1990–1992 versus 96% 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%1990: Good 245 of 355 days1990: Moderate 89 of 355 days1990: Unhealthy for Sensitive Groups 20 of 355 days1990: Unhealthy 1 of 355 days19901991: Good 261 of 340 days1991: Moderate 65 of 340 days1991: Unhealthy for Sensitive Groups 12 of 340 days1991: Unhealthy 2 of 340 days1992: Good 289 of 358 days1992: Moderate 56 of 358 days1992: Unhealthy for Sensitive Groups 13 of 358 days1993: Good 285 of 359 days1993: Moderate 69 of 359 days1993: Unhealthy for Sensitive Groups 5 of 359 days1994: Good 246 of 336 days1994: Moderate 78 of 336 days1994: Unhealthy for Sensitive Groups 10 of 336 days1994: Unhealthy 2 of 336 days1995: Good 172 of 271 days1995: Moderate 74 of 271 days1995: Unhealthy for Sensitive Groups 23 of 271 days1995: Unhealthy 2 of 271 days19951996: Good 126 of 159 days1996: Moderate 28 of 159 days1996: Unhealthy for Sensitive Groups 5 of 159 days1997: Good 268 of 363 days1997: Moderate 87 of 363 days1997: Unhealthy for Sensitive Groups 8 of 363 days1998: Good 235 of 350 days1998: Moderate 85 of 350 days1998: Unhealthy for Sensitive Groups 28 of 350 days1998: Unhealthy 2 of 350 days1999: Good 220 of 361 days1999: Moderate 98 of 361 days1999: Unhealthy for Sensitive Groups 38 of 361 days1999: Unhealthy 5 of 361 days2000: Good 221 of 348 days2000: Moderate 98 of 348 days2000: Unhealthy for Sensitive Groups 27 of 348 days2000: Unhealthy 2 of 348 days20002001: Good 267 of 352 days2001: Moderate 76 of 352 days2001: Unhealthy for Sensitive Groups 9 of 352 days2002: Good 297 of 355 days2002: Moderate 49 of 355 days2002: Unhealthy for Sensitive Groups 7 of 355 days2002: Unhealthy 2 of 355 days2003: Good 294 of 363 days2003: Moderate 60 of 363 days2003: Unhealthy for Sensitive Groups 9 of 363 days2004: Good 297 of 346 days2004: Moderate 46 of 346 days2004: Unhealthy for Sensitive Groups 3 of 346 days2005: Good 275 of 343 days2005: Moderate 65 of 343 days2005: Unhealthy for Sensitive Groups 3 of 343 days20052006: Good 287 of 361 days2006: Moderate 70 of 361 days2006: Unhealthy for Sensitive Groups 4 of 361 days2007: Good 285 of 356 days2007: Moderate 66 of 356 days2007: Unhealthy for Sensitive Groups 5 of 356 days2008: Good 267 of 309 days2008: Moderate 42 of 309 days2009: Good 313 of 329 days2009: Moderate 16 of 329 days2010: Good 318 of 360 days2010: Moderate 35 of 360 days2010: Unhealthy for Sensitive Groups 7 of 360 days20102011: Good 302 of 330 days2011: Moderate 28 of 330 days2012: Good 321 of 354 days2012: Moderate 32 of 354 days2012: Unhealthy for Sensitive Groups 1 of 354 days2013: Good 333 of 342 days2013: Moderate 8 of 342 days2013: Unhealthy for Sensitive Groups 1 of 342 days2014: Good 315 of 322 days2014: Moderate 7 of 322 days2015: Good 325 of 329 days2015: Moderate 4 of 329 days20152016: Good 353 of 360 days2016: Moderate 7 of 360 days2017: Good 351 of 353 days2017: Moderate 2 of 353 days2018: Good 318 of 325 days2018: Moderate 7 of 325 days2019: Good 334 of 348 days2019: Moderate 14 of 348 days2020: Good 345 of 348 days2020: Moderate 3 of 348 days20202021: Good 354 of 359 days2021: Moderate 5 of 359 days2022: Good 327 of 340 days2022: Moderate 13 of 340 days2023: Good 328 of 344 days2023: Moderate 15 of 344 days2023: Unhealthy for Sensitive Groups 1 of 344 days2024: Good 331 of 347 days2024: Moderate 16 of 347 days2025: Good 342 of 354 days2025: Moderate 12 of 354 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 year0501001501990: 90th percentile AQI 871991: 90th percentile AQI 841992: 90th percentile AQI 711993: 90th percentile AQI 671994: 90th percentile AQI 801995: 90th percentile AQI 1001996: 90th percentile AQI 801997: 90th percentile AQI 801998: 90th percentile AQI 1001999: 90th percentile AQI 1052000: 90th percentile AQI 972001: 90th percentile AQI 772002: 90th percentile AQI 642003: 90th percentile AQI 672004: 90th percentile AQI 582005: 90th percentile AQI 712006: 90th percentile AQI 742007: 90th percentile AQI 712008: 90th percentile AQI 582009: 90th percentile AQI 482010: 90th percentile AQI 542011: 90th percentile AQI 502012: 90th percentile AQI 502013: 90th percentile AQI 442014: 90th percentile AQI 442015: 90th percentile AQI 432016: 90th percentile AQI 462017: 90th percentile AQI 412018: 90th percentile AQI 442019: 90th percentile AQI 452020: 90th percentile AQI 422021: 90th percentile AQI 442022: 90th percentile AQI 452023: 90th percentile AQI 482024: 90th percentile AQI 482025: 90th percentile AQI 451990: Median AQI 441991: Median AQI 401992: Median AQI 381993: Median AQI 401994: Median AQI 401995: Median AQI 461996: Median AQI 321997: Median AQI 411998: Median AQI 441999: Median AQI 462000: Median AQI 442001: Median AQI 412002: Median AQI 382003: Median AQI 372004: Median AQI 362005: Median AQI 392006: Median AQI 412007: Median AQI 382008: Median AQI 352009: Median AQI 332010: Median AQI 362011: Median AQI 372012: Median AQI 362013: Median AQI 312014: Median AQI 312015: Median AQI 332016: Median AQI 332017: Median AQI 322018: Median AQI 292019: Median AQI 332020: Median AQI 312021: Median AQI 312022: Median AQI 342023: Median AQI 362024: Median AQI 362025: Median AQI 3419901995200020052010201520202025
  • 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
Ozone354100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025354342120000344580Ozone
2024347331160000364880Ozone
20233443281510003648119Ozone
20223403271300003445100Ozone
202135935450000314461Ozone
202034834530000314251Ozone
2019348334140000334571Ozone
201832531870000294471Ozone
201735335120000324154Ozone
201636035370000334664Ozone
201532932540000334397Ozone
201432231570000314490Ozone
2013342333810003144105Ozone
20123543213210003650108Ozone
2011330302280000375087Ozone
20103603183570003654126Ozone
2009329313160000334884Ozone
2008309267420000355893Ozone
20073562856650003871126Ozone
20063612877040004174122Ozone
20053432756530003971122Ozone
20043462974630003658119Ozone
20033632946090003767140Ozone
20023552974972003864177Ozone
20013522677690004177136Ozone
200034822198272004497166Ozone
1999361220983850046105177Ozone
1998350235852820044100154Ozone
19973632688780004180133Ozone
19961591262850003280129Ozone
1995271172742320046100154Ozone
199433624678102004080172Ozone
19933592856950004067150Ozone
199235828956130003871136Ozone
199134026165122004084166Ozone
199035524589201004487172Ozone

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 1990–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem