Median AQI
42
Good
Missouri · County air quality · 2025
Jasper County, Missouri
Median AQI 42 (Good). 78.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 42
- Median AQI
- 78.4%
- Good-air days
- 1
- Unhealthy days
- 47%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Jasper County's air is good on balance, more polluted than the median US county, a median AQI of 42 with 78.4% of 148 monitored days in the Good band, driven mainly by Ozone.
- 42
- median AQI · Good
- 78.4%
- days rated Good
- Ozone
- main pollutant
- 47%
- cleaner than US counties
1 day reached Unhealthy or worse; the worst single reading hit AQI 162.
Data updated July 2026
- Good · 116 d · 78.4%
- Moderate · 30 d · 20.3%
- USG · 1 d · 0.7%
- Unhealthy · 1 d · 0.7%
How did Jasper County's air break down in 2025?
Across 148 monitored days, 116 fell in the Good band (AQI 0–50) and 1 reached Unhealthy or worse. The worst single day peaked at AQI 162 (Unhealthy).
EPA AQS →Air quality data from EPA Air Quality System (2025). 148 days monitored. Median AQI: 42 (Good).
Insights: Jasper County, Missouri. EPA monitors recorded a median Air Quality Index of 42 across 148 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 116 (78%) fell in the Good band (AQI 0–50), 30 (20%) registered Moderate readings, and 1 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 66, while the worst single-day peak hit 162 (Unhealthy). Residents averaged about 23.5 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as Ozone (75 days), PM10 (73 days). Across the 2020–2025 trend window, good days shifted by -204 and the median AQI moved +7 points, placing the multi-year trajectory at worsening. Residents and visitors experienced 1 unhealthy-or-worse days combined, periods when the EPA recommends sensitive groups limit prolonged outdoor exertion. Nearby counties show comparable readings: Andrew (84.3% good, AQI 42); Boone (89.1% good, AQI 41); Buchanan (64.2% good, AQI 39); Callaway (85.6% good, AQI 42); Cass (82.2% good, AQI 41); Cedar (81.8% good, AQI 40).
Air Quality Summary
Good Days
78.4%
116 of 148 monitored days
3.4pp vs 75% target
Max AQI Recorded
162
Unhealthy
Health Grade
Good
90th-pct AQI 66
Jasper County, Good days share 78.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Jasper County, Unhealthy-or-worse share 0.7%
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 148 monitored days across EPA AQI categories.
Good
116
78%
Moderate
30
20%
USG
1
1%
Unhealthy
1
1%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Jasper County.
- Ozone · 75 days · 50.7%
- PM10 · 73 days · 49.3%
Health Impact Assessment
Good
Jasper County's air quality is rated Good based on 78.4% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 1 days reached "Unhealthy for Sensitive Groups" (AQI 101-150) and peak AQI reached 162. Sensitive groups should monitor real-time conditions at AirNow.gov.
The dominant pollutant is Ozone, driving AQI on 75 of 148 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Jasper County. Best year: 2020 (320 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 320 | 46 | 0 | 0 | 35 | 82 |
| 2021 | 298 | 62 | 0 | 0 | 38 | 93 |
| 2022 | 283 | 79 | 1 | 0 | 41 | 108 |
| 2023 | 288 | 73 | 4 | 0 | 42 | 119 |
| 2024 | 289 | 70 | 0 | 0 | 41 | 99 |
| 2025 | 116 | 30 | 1 | 1 | 42 | 162 |
How does Jasper County compare?
How Jasper County compares
Good-day share better than US avg
Jasper County 78.4%
Andrew County, Missouri 84.3%
US average 76.5%
Median AQI worse than US avg
Jasper County 42
Andrew County, Missouri 42
US average 38
Unhealthy days / yr worse than US avg
Jasper County 1
Andrew County, Missouri 0
US average 0
Other Counties in Missouri
Air quality comparison for nearby counties in Missouri.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Jasper County.
Adams County, Pennsylvania
AQI 42 · 73.8% good
Anderson County, Tennessee
AQI 42 · 91.0% good
Andrew County, Missouri
AQI 42 · 84.3% good
Armstrong County, Pennsylvania
AQI 42 · 68.1% good
Baldwin County, Alabama
AQI 42 · 72.2% good
Belmont County, Ohio
AQI 42 · 63.0% good
What Jasper County's air means for you
On most days the air here is fine, but Ozone drives 1 unhealthy-or-worse day a year that sensitive groups should plan around.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-Ozone days, the guide explains what a median of 42 means for exposure. Health guidance
- See how Jasper County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Jasper County with its Missouri neighbours before drawing a conclusion about the region. All of Missouri
Based on 148 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 Jasper County, Missouri? ▼
Jasper County has a median Air Quality Index (AQI) of 42, rated "Good." 78.4% of monitored days (116 out of 148) had good air quality in 2025.
What is the main pollutant in Jasper County? ▼
The primary pollutant in Jasper County is Ozone (O3), which was the main AQI driver on 75 days (51% of monitored days). Can trigger asthma, reduce lung function, and cause chest pain.
How many unhealthy air days does Jasper County have? ▼
In 2025, Jasper County recorded 1 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 162.
Is the air quality in Jasper County getting better or worse? ▼
Air quality in Jasper County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 320 good days. Worst year: 2025 with 116 good days.
What does AQI 42 mean for health? ▼
Jasper County's median AQI of 42 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 Jasper County compare to other counties in Missouri? ▼
Jasper County has 78.4% good air days. Nearby counties in Missouri: Andrew (84.3% good), Boone (89.1% good), Buchanan (64.2% good), Callaway (85.6% good), Cass (82.2% good), Cedar (81.8% good).
What is the 90th percentile AQI in Jasper County? ▼
The 90th percentile AQI for Jasper County is 66, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 162 (Unhealthy).
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.