Median AQI
33
Good
Mississippi · County air quality · 2025
Yalobusha County, Mississippi
Median AQI 33 (Good). 96.1% of monitored days rated Good, direct from EPA Air Quality System stations.
- 33
- Median AQI
- 96.1%
- Good-air days
- 0
- Unhealthy days
- 92%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Yalobusha County's air is good on balance, among the cleanest 10% of US counties, a median AQI of 33 with 96.1% of 232 monitored days in the Good band, driven mainly by Ozone.
- 33
- median AQI · Good
- 96.1%
- days rated Good
- Ozone
- main pollutant
- 92%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 80.
Data updated July 2026
- Good · 223 d · 96.1%
- Moderate · 9 d · 3.9%
How did Yalobusha County's air break down in 2025?
Across 232 monitored days, 223 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 80 (Moderate).
EPA AQS →Air quality data from EPA Air Quality System (2025). 232 days monitored. Median AQI: 33 (Good).
Insights: Yalobusha County, Mississippi. EPA monitors recorded a median Air Quality Index of 33 across 232 measured days in 2025, earning a Good classification and a Excellent health grade. Of those days, 223 (96%) fell in the Good band (AQI 0–50), 9 (4%) registered Moderate readings, and 0 (0%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 45, while the worst single-day peak hit 80 (Moderate). Residents averaged about 28.8 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (232 days). Across the 2020–2025 trend window, good days shifted by -122 and the median AQI moved +2 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 80, moderate but never Unhealthy. Nearby counties show comparable readings: Bolivar (70.3% good, AQI 44); DeSoto (67.0% good, AQI 44); Forrest (62.4% good, AQI 46); Hancock (67.8% good, AQI 44); Harrison (64.5% good, AQI 45); Hinds (43.4% good, AQI 52).
Air Quality Summary
Good Days
96.1%
223 of 232 monitored days
21.1pp vs 75% target
Max AQI Recorded
80
Moderate
Health Grade
Excellent
90th-pct AQI 45
Yalobusha County, Good days share 96.1%
National avg
Share of monitored days at AQI 0-50 (Good band).
Yalobusha County, Unhealthy-or-worse share 0.0%
National avg
Share of monitored days above AQI 150 (Unhealthy or worse). Bar maxes at 10% (worst-county ceiling).
AQI Day Breakdown (2025)
Distribution of 232 monitored days across EPA AQI categories.
Good
223
96%
Moderate
9
4%
USG
0
0%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Yalobusha County.
- Ozone · 232 days · 100.0%
Health Impact Assessment
Excellent
Yalobusha County's air quality is rated Excellent based on 96.1% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 96.1% of monitored days in 2025, with a median AQI of 33. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is Ozone, driving AQI on 232 of 232 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Yalobusha County. Best year: 2021 (354 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 345 | 3 | 0 | 0 | 31 | 51 |
| 2021 | 354 | 5 | 0 | 0 | 31 | 61 |
| 2022 | 327 | 13 | 0 | 0 | 34 | 100 |
| 2023 | 328 | 15 | 1 | 0 | 36 | 119 |
| 2024 | 331 | 16 | 0 | 0 | 36 | 80 |
| 2025 | 223 | 9 | 0 | 0 | 33 | 80 |
How does Yalobusha County compare?
How Yalobusha County compares
Good-day share better than US avg
Yalobusha County 96.1%
Bolivar County, Mississippi 70.3%
US average 76.5%
Median AQI better than US avg
Yalobusha County 33
Bolivar County, Mississippi 44
US average 38
Unhealthy days / yr about average
Yalobusha County 0
Bolivar County, Mississippi 0
US average 0
Other Counties in Mississippi
Air quality comparison for nearby counties in Mississippi.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Yalobusha County.
Ascension County, Louisiana
AQI 33 · 94.1% good
Athens County, Ohio
AQI 33 · 80.3% good
Brazoria County, Texas
AQI 33 · 84.8% good
Bristol City County, Virginia
AQI 33 · 78.3% good
Carter County, Oklahoma
AQI 33 · 80.9% good
Codington County, South Dakota
AQI 33 · 82.1% good
What Yalobusha County's air means for you
The air here stays in the breathable range year-round, with Ozone the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 33 means for exposure. Health guidance
- See how Yalobusha County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Yalobusha County with its Mississippi neighbours before drawing a conclusion about the region. All of Mississippi
Based on 232 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
More Air Quality Data
Air Quality Guides
Frequently Asked Questions
What is the air quality in Yalobusha County, Mississippi? ▼
Yalobusha County has a median Air Quality Index (AQI) of 33, rated "Good." 96.1% of monitored days (223 out of 232) had good air quality in 2025.
What is the main pollutant in Yalobusha County? ▼
The primary pollutant in Yalobusha County is Ozone (O3), which was the main AQI driver on 232 days (100% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Yalobusha County have? ▼
In 2025, Yalobusha County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 80.
Is the air quality in Yalobusha County getting better or worse? ▼
Air quality in Yalobusha County is worsening based on 5-year trends (2020-2025). Best year: 2021 with 354 good days. Worst year: 2025 with 223 good days.
What does AQI 33 mean for health? ▼
Yalobusha County's median AQI of 33 falls in the "Good" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Yalobusha County compare to other counties in Mississippi? ▼
Yalobusha County has 96.1% good air days. Nearby counties in Mississippi: Bolivar (70.3% good), DeSoto (67.0% good), Forrest (62.4% good), Hancock (67.8% good), Harrison (64.5% good), Hinds (43.4% good).
What is the 90th percentile AQI in Yalobusha County? ▼
The 90th percentile AQI for Yalobusha County is 45, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 80 (Moderate).
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by County dataset, 2020–2025 (aqs.epa.gov). For current conditions (not shown here — this page is historical annual data), see EPA AirNow (airnow.gov). See our methodology for how AQI, median, and coverage figures are computed.
Informational only, not professional advice. Data from EPA AQS. See our disclaimer.
Every figure on PlainAir is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.