Median AQI
52
Moderate
Ohio · County air quality · 2025
Lucas County, Ohio
Median AQI 52 (Moderate). 47.4% of monitored days rated Good, direct from EPA Air Quality System stations.
- 52
- Median AQI
- 47.4%
- Good-air days
- 1
- Unhealthy days
- 5%
- Cleaner than US counties
Lucas County's 2025 annual median AQI is 52 (Moderate), with 47.4% Good days
According to the U.S. EPA Air Quality System, Lucas County, Ohio posted a 2025 median AQI of 52 (Moderate) across 365 monitored days, with 47.4% rated Good and 1 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Lucas County's 47.4% Good-day share places it cleaner than 5% of US counties in 2025.
- Closest median-AQI peer
- Allegheny County (46.0% Good, median AQI 52) is the closest nationwide median-AQI peer to Lucas County.
- 2020–2025 trend
- Lucas County's floor-qualifying Good-day share is worsening from 2020 to 2025 (70.6% → 47.4%).
- Median AQI
- Median AQI: 52
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 52 with 47.4% of 365 monitored days in the Good band, driven mainly by PM2.5.
- 52
- median AQI · Moderate
- 47.4%
- days rated Good
- PM2.5
- main pollutant
- 5%
- cleaner than US counties
1 day reached Unhealthy or worse; the worst single reading hit AQI 154.
Annual release change
What changed in the 2025 EPA annual release
- Lucas County's Good-day share rose from 42.3% to 47.4% between the 2024 and 2025 EPA annual releases, a change of +5.0 percentage points.
- Lucas County's peak single-day AQI rose from 119 to 154 between the 2024 and 2025 EPA annual releases, a change of +35 points.
- Lucas County's Unhealthy-category days rose from 0 to 1 between the 2024 and 2025 EPA annual releases, a change of +1 days.
Data updated August 2026
- Good · 173 d · 47.4%
- Moderate · 183 d · 50.1%
- USG · 8 d · 2.2%
- Unhealthy · 1 d · 0.3%
How did Lucas County's air break down in 2025?
Across 365 monitored days, 173 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). 365 days monitored. Median AQI: 52 (Moderate).
Insights: Lucas County, Ohio. EPA monitors recorded a median Air Quality Index of 52 across 365 measured days in 2025, earning a Moderate classification and a Poor health grade. Of those days, 173 (47%) fell in the Good band (AQI 0–50), 183 (50%) registered Moderate readings, and 8 (2%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 72, while the worst single-day peak hit 154 (Unhealthy). Residents averaged about 14.2 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (258 days), Ozone (107 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -23.2 points and the median AQI moved +10 points, placing the multi-year trajectory at worsening. The annual record contains 1 day at Unhealthy or worse. On that day, the EPA recommends that sensitive groups limit prolonged outdoor exertion. Nearby counties show comparable readings: Allen (67.0% good, AQI 42); Ashtabula (81.2% good, AQI 43); Athens (83.4% good, AQI 31); Belmont (63.0% good, AQI 42); Butler (33.1% good, AQI 55); Clark (61.4% good, AQI 45).
Air Quality Summary
Good Days
47.4%
173 of 365 monitored days
-27.6pp vs 75% target
Max AQI Recorded
154
Unhealthy
Health Grade
Poor
90th-pct AQI 72
Lucas County, Good days share 47.4%
National avg
Share of monitored days at AQI 0-50 (Good band).
Lucas County, Unhealthy-or-worse share 2.7%
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 365 monitored days across EPA AQI categories.
Good
173
47%
Moderate
183
50%
USG
8
2%
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 · 258 days · 70.7%
- Ozone · 107 days · 29.3%
Health Impact Assessment
Poor
Lucas County's air quality is rated Poor based on 47.4% 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 258 of 365 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Lucas County. Highest Good-day share: 2020 (70.6%, 250 of 354 monitored 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 | 173 | 183 | 8 | 1 | 52 | 154 |
How does Lucas County compare?
How Lucas County compares
Good-day share worse than typical
Lucas County 47.4%
Allegheny County, Pennsylvania 46.0%
Typical US county 76.0%
Median AQI worse than typical
Lucas County 52
Allegheny County, Pennsylvania 52
Typical US county 39
Unhealthy days / yr about typical
Lucas County 1
Allegheny County, Pennsylvania 0
Typical US county 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Lucas County (52), not geographic neighbors.
Allegheny County, Pennsylvania
Median AQI 52 · 46.0% Good-day share
Bexar County, Texas
Median AQI 52 · 43.3% Good-day share
Bibb County, Georgia
Median AQI 52 · 42.7% Good-day share
Hidalgo County, Texas
Median AQI 52 · 44.4% Good-day share
Hinds County, Mississippi
Median AQI 52 · 45.8% Good-day share
Jefferson County, Alabama
Median AQI 52 · 43.6% Good-day share
Same primary pollutant: PM2.5
PM2.5 led the AQI on the most monitored days here. These peers share that driver and the closest Good-day share (a second relationship type beyond median-AQI neighbors).
Richmond County, Georgia
46.9% Good-day share · median AQI 52
Duval County, Florida
48.0% Good-day share · median AQI 51
Jefferson County, Texas
48.0% Good-day share · median AQI 51
McLennan County, Texas
46.6% Good-day share · median AQI 51
Mecklenburg County, North Carolina
48.2% Good-day share · median AQI 51
Davidson County, North Carolina
45.8% Good-day share · median AQI 51
Ohio counties on the map
Geographic containment only, other monitored counties in Ohio, independent of AQI or pollutant match.
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 52 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 365 EPA-monitored days in 2025; figures reflect only days the monitors reported. Source: EPA Air Quality System annual summaries.
Keep exploring the annual AQI record
Air-quality reading list
Frequently Asked Questions
What is the air quality in Lucas County, Ohio? ▼
Lucas County has a median Air Quality Index (AQI) of 52, rated "Moderate." 47.4% of monitored days (173 out of 365) 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 258 days (71% 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 across floor-qualifying years (2020-2025); years with fewer than 100 monitored days are excluded from that direction. Highest qualifying Good-day share: 2020 at 70.6% (250 of 354 days). Lowest qualifying Good-day share: 2024 at 42.3% (155 of 366 days).
What does AQI 52 mean for health? ▼
Lucas County's median AQI of 52 falls in the "Moderate" category. See the AQI category guide for what each range means for health.
How does Lucas County compare to other counties in Ohio? ▼
Lucas County has 47.4% good air days. Nearby counties in Ohio: Allen (67.0% good), Ashtabula (81.2% good), Athens (83.4% good), Belmont (63.0% good), Butler (33.1% good), Clark (61.4% good).
What is the 90th percentile AQI in Lucas County? ▼
The 90th percentile AQI for Lucas County is 72, 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. Spotted a figure that looks wrong? Report a correction.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by county summary files for Lucas County, Ohio · 2020–2025
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Every figure on PlainAirData 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.