Median AQI
53
Moderate
Ohio · County air quality · 2025
Lucas County, Ohio
Median AQI 53 (Moderate). 41.8% of monitored days rated Good, direct from EPA Air Quality System stations.
- 53
- Median AQI
- 41.8%
- Good-air days
- 1
- Unhealthy days
- 4%
- Cleaner than US counties
The verdict
According to EPA Air Quality System monitoring data, Lucas County's air is moderate on balance, among the most polluted counties nationally, a median AQI of 53 with 41.8% of 273 monitored days in the Good band, driven mainly by PM2.5.
- 53
- median AQI · Moderate
- 41.8%
- days rated Good
- PM2.5
- main pollutant
- 4%
- cleaner than US counties
1 day reached Unhealthy or worse; the worst single reading hit AQI 154.
Data updated July 2026
- Good · 114 d · 41.8%
- Moderate · 150 d · 54.9%
- USG · 8 d · 2.9%
- Unhealthy · 1 d · 0.4%
How did Lucas County's air break down in 2025?
Across 273 monitored days, 114 fell in the Good band (AQI 0–50) and 1 reached Unhealthy or worse. The worst single day peaked at AQI 154 (Unhealthy).
EPA AQS →Air quality data from EPA Air Quality System (2025). 273 days monitored. Median AQI: 53 (Moderate).
Insights: Lucas County, Ohio. EPA monitors recorded a median Air Quality Index of 53 across 273 measured days in 2025, earning a Moderate classification and a Poor health grade. Of those days, 114 (42%) fell in the Good band (AQI 0–50), 150 (55%) registered Moderate readings, and 8 (3%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 79, while the worst single-day peak hit 154 (Unhealthy). Residents averaged about 12.5 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (184 days), Ozone (89 days). Across the 2020–2025 trend window, good days shifted by -136 and the median AQI moved +11 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: Allen (65.9% good, AQI 43); Ashtabula (81.2% good, AQI 43); Athens (80.3% good, AQI 33); Belmont (63.0% good, AQI 42); Butler (33.3% good, AQI 55); Clark (59.4% good, AQI 46).
Air Quality Summary
Good Days
41.8%
114 of 273 monitored days
-33.2pp vs 75% target
Max AQI Recorded
154
Unhealthy
Health Grade
Poor
90th-pct AQI 79
Lucas County, Good days share 41.8%
National avg
Share of monitored days at AQI 0-50 (Good band).
Lucas County, Unhealthy-or-worse share 0.4%
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 273 monitored days across EPA AQI categories.
Good
114
42%
Moderate
150
55%
USG
8
3%
Unhealthy
1
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Lucas County.
- PM2.5 · 184 days · 67.4%
- Ozone · 89 days · 32.6%
Health Impact Assessment
Poor
Lucas County's air quality is rated Poor based on 41.8% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 8 days reached "Unhealthy for Sensitive Groups" (AQI 101-150) and peak AQI reached 154. Sensitive groups should monitor real-time conditions at AirNow.gov.
The dominant pollutant is PM2.5, driving AQI on 184 of 273 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Lucas County. Best year: 2020 (250 good days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 250 | 96 | 8 | 0 | 42 | 136 |
| 2021 | 221 | 138 | 5 | 0 | 46 | 122 |
| 2022 | 240 | 117 | 5 | 0 | 44 | 119 |
| 2023 | 217 | 133 | 13 | 2 | 45 | 190 |
| 2024 | 155 | 207 | 4 | 0 | 52 | 119 |
| 2025 | 114 | 150 | 8 | 1 | 53 | 154 |
How does Lucas County compare?
How Lucas County compares
Good-day share worse than US avg
Lucas County 41.8%
Allen County, Ohio 65.9%
US average 76.5%
Median AQI worse than US avg
Lucas County 53
Allen County, Ohio 43
US average 38
Unhealthy days / yr worse than US avg
Lucas County 1
Allen County, Ohio 0
US average 0
Other Counties in Ohio
Air quality comparison for nearby counties in Ohio.
Counties with Similar Air Quality
Counties across the US with a similar median AQI to Lucas County.
Bexar County, Texas
AQI 53 · 39.8% good
Cook County, Illinois
AQI 53 · 40.5% good
Cuyahoga County, Ohio
AQI 53 · 43.6% good
Dallas County, Texas
AQI 53 · 41.0% good
Jefferson County, Alabama
AQI 53 · 36.8% good
Kings County, California
AQI 53 · 39.8% good
What Lucas County's air means for you
On most days the air here is fine, but PM2.5 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-PM2.5 days, the guide explains what a median of 53 means for exposure. Health guidance
- See how Lucas County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Lucas County with its Ohio neighbours before drawing a conclusion about the region. All of Ohio
Based on 273 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 Lucas County, Ohio? ▼
Lucas County has a median Air Quality Index (AQI) of 53, rated "Moderate." 41.8% of monitored days (114 out of 273) had good air quality in 2025.
What is the main pollutant in Lucas County? ▼
The primary pollutant in Lucas County is Fine Particles (PM2.5), which was the main AQI driver on 184 days (67% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Lucas County have? ▼
In 2025, Lucas County recorded 1 unhealthy air days (1 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 154.
Is the air quality in Lucas County getting better or worse? ▼
Air quality in Lucas County is worsening based on 5-year trends (2020-2025). Best year: 2020 with 250 good days. Worst year: 2025 with 114 good days.
What does AQI 53 mean for health? ▼
Lucas County's median AQI of 53 falls in the "Moderate" category. See the <a href="/guides/understanding-aqi" class="underline">AQI category guide</a> for what each range means for health.
How does Lucas County compare to other counties in Ohio? ▼
Lucas County has 41.8% good air days. Nearby counties in Ohio: Allen (65.9% good), Ashtabula (81.2% good), Athens (80.3% good), Belmont (63.0% good), Butler (33.3% good), Clark (59.4% good).
What is the 90th percentile AQI in Lucas County? ▼
The 90th percentile AQI for Lucas County is 79, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 154 (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.