Median AQI
34
Good
Maine · County air quality · 2025
Androscoggin County, Maine
Median AQI 34 (Good). 85.2% of monitored days rated Good, direct from EPA Air Quality System stations.
- 34
- Median AQI
- 85.2%
- Good-air days
- 0
- Unhealthy days
- 70%
- Cleaner than US counties
Androscoggin County's 2025 annual median AQI is 34 (Good), with 85.2% Good days
According to the U.S. EPA Air Quality System, Androscoggin County, Maine posted a 2025 median AQI of 34 (Good) across 365 monitored days, with 85.2% rated Good and 0 unhealthy or worse. This is an annual comparison, not today's advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US
- Androscoggin County's 85.2% Good-day share places it cleaner than 70% of US counties in 2025.
- Closest median-AQI peer
- Archuleta County (83.0% Good, median AQI 34) is the closest nationwide median-AQI peer to Androscoggin County.
- 2020–2025 trend
- Androscoggin County's floor-qualifying Good-day share is worsening from 2020 to 2025 (90.8% → 85.2%).
- Median AQI
- Median AQI: 34
The verdict
According to EPA Air Quality System monitoring data, Androscoggin County's air is good on balance, cleaner than the median US county, a median AQI of 34 with 85.2% of 365 monitored days in the Good band, driven mainly by PM2.5.
- 34
- median AQI · Good
- 85.2%
- days rated Good
- PM2.5
- main pollutant
- 70%
- cleaner than US counties
Not one day crossed into the Unhealthy tier; the worst single reading was AQI 112.
Annual release change
What changed in the 2025 EPA annual release
- Androscoggin County's Good-day share fell from 92.6% to 85.2% between the 2024 and 2025 EPA annual releases, a change of -7.4 percentage points.
- Androscoggin County's peak single-day AQI rose from 77 to 112 between the 2024 and 2025 EPA annual releases, a change of +35 points.
- Androscoggin County's median AQI rose from 31 to 34 between the 2024 and 2025 EPA annual releases, a change of +3 points.
Data updated August 2026
- Good · 311 d · 85.2%
- Moderate · 52 d · 14.2%
- USG · 2 d · 0.5%
How did Androscoggin County's air break down in 2025?
Across 365 monitored days, 311 fell in the Good band (AQI 0–50) and 0 reached Unhealthy or worse. The worst single day peaked at AQI 112 (USG).
EPA AQS →Air quality data from EPA Air Quality System (2025). 365 days monitored. Median AQI: 34 (Good).
Insights: Androscoggin County, Maine. EPA monitors recorded a median Air Quality Index of 34 across 365 measured days in 2025, earning a Good classification and a Good health grade. Of those days, 311 (85%) fell in the Good band (AQI 0–50), 52 (14%) registered Moderate readings, and 2 (1%) reached Unhealthy for Sensitive Groups. The 90th-percentile AQI settled at 54, while the worst single-day peak hit 112 (USG). Residents averaged about 25.6 clean-air days per 30-day window during the monitoring year.
The full pollutant mix ranks as PM2.5 (185 days), Ozone (175 days), PM10 (5 days). Across the 2020–2025 trend window, the share of monitored days rated Good shifted by -5.6 points and the median AQI moved +0 points, placing the multi-year trajectory at worsening. The worst single reading over the 2020–2025 window was AQI 112, usg but never Unhealthy. Nearby counties show comparable readings: Aroostook (83.3% good, AQI 32); Cumberland (74.3% good, AQI 39); Hancock (91.0% good, AQI 35); Kennebec (85.2% good, AQI 34); Knox (97.8% good, AQI 33); Oxford (75.9% good, AQI 38).
Air Quality Summary
Good Days
85.2%
311 of 365 monitored days
10.2pp vs 75% target
Max AQI Recorded
112
USG
Health Grade
Good
90th-pct AQI 54
Androscoggin County, Good days share 85.2%
National avg
Share of monitored days at AQI 0-50 (Good band).
Androscoggin 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 365 monitored days across EPA AQI categories.
Good
311
85%
Moderate
52
14%
USG
2
1%
Unhealthy
0
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Pollutant Breakdown
Days where each pollutant was the primary driver of AQI readings in Androscoggin County.
- PM2.5 · 185 days · 50.7%
- Ozone · 175 days · 47.9%
- PM10 · 5 days · 1.4%
Health Impact Assessment
Good
Androscoggin County's air quality is rated Good based on 85.2% good air days. No unhealthy air days were recorded in 2025.
Air quality was acceptable on 85.2% of monitored days in 2025, with a median AQI of 34. Unusually sensitive people can check real-time conditions at AirNow.gov during high-pollution events.
The dominant pollutant is PM2.5, driving AQI on 185 of 365 monitored days.
5-Year Air Quality Trend
Air quality is worsening in Androscoggin County. Highest Good-day share: 2024 (92.6%, 339 of 366 monitored days).
| Year | Good | Moderate | USG | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|---|
| 2020 | 327 | 33 | 0 | 0 | 34 | 70 |
| 2021 | 303 | 53 | 0 | 0 | 36 | 95 |
| 2022 | 327 | 31 | 0 | 0 | 32 | 97 |
| 2023 | 296 | 63 | 0 | 0 | 35 | 77 |
| 2024 | 339 | 27 | 0 | 0 | 31 | 77 |
| 2025 | 311 | 52 | 2 | 0 | 34 | 112 |
How does Androscoggin County compare?
How Androscoggin County compares
Good-day share better than US avg
Androscoggin County 85.2%
Archuleta County, Colorado 83.0%
US average 76.0%
Median AQI better than US avg
Androscoggin County 34
Archuleta County, Colorado 34
US average 39
Unhealthy days / yr better than US avg
Androscoggin County 0
Archuleta County, Colorado 0
US average 1
Counties with a similar median AQI
Nationwide peers within about the same annual median AQI as Androscoggin County (34), not geographic neighbors.
Archuleta County, Colorado
Median AQI 34 · 83.0% Good-day share
Bristol City County, Virginia
Median AQI 34 · 78.0% Good-day share
Brown County, Indiana
Median AQI 34 · 95.9% Good-day share
Clark County, Arkansas
Median AQI 34 · 96.7% Good-day share
Clay County, South Dakota
Median AQI 34 · 87.8% Good-day share
Dawson County, Georgia
Median AQI 34 · 95.1% 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).
Kennebec County, Maine
85.2% Good-day share · median AQI 34
Wallowa County, Oregon
85.2% Good-day share · median AQI 26
Fajardo County, Puerto Rico
85.2% Good-day share · median AQI 29
Lynchburg City County, Virginia
85.2% Good-day share · median AQI 30
Clallam County, Washington
85.5% Good-day share · median AQI 29
Loudon County, Tennessee
85.5% Good-day share · median AQI 39
Maine counties on the map
Geographic containment only, other monitored counties in Maine, independent of AQI or pollutant match.
What Androscoggin County's air means for you
The air here stays in the breathable range year-round, with PM2.5 the main thing to watch.
- Sensitive groups (asthma, heart conditions, children, older adults) should check the AQI on high-PM2.5 days, the guide explains what a median of 34 means for exposure. Health guidance
- See how Androscoggin County ranks against every monitored U.S. county on Good-day share. County rankings
- Compare Androscoggin County with its Maine neighbours before drawing a conclusion about the region. All of Maine
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 Androscoggin County, Maine? ▼
Androscoggin County has a median Air Quality Index (AQI) of 34, rated "Good." 85.2% of monitored days (311 out of 365) had good air quality in 2025.
What is the main pollutant in Androscoggin County? ▼
The primary pollutant in Androscoggin County is Fine Particles (PM2.5), which was the main AQI driver on 185 days (51% of monitored days). Penetrates deep into lungs and bloodstream. Linked to heart disease and premature death.
How many unhealthy air days does Androscoggin County have? ▼
In 2025, Androscoggin County recorded 0 unhealthy air days (0 Unhealthy, 0 Very Unhealthy, 0 Hazardous). The maximum AQI reached 112.
Is the air quality in Androscoggin County getting better or worse? ▼
Air quality in Androscoggin 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: 2024 at 92.6% (339 of 366 days). Lowest qualifying Good-day share: 2023 at 82.5% (296 of 359 days).
What does AQI 34 mean for health? ▼
Androscoggin County's median AQI of 34 falls in the "Good" category. See the AQI category guide for what each range means for health.
How does Androscoggin County compare to other counties in Maine? ▼
Androscoggin County has 85.2% good air days. Nearby counties in Maine: Aroostook (83.3% good), Cumberland (74.3% good), Hancock (91.0% good), Kennebec (85.2% good), Knox (97.8% good), Oxford (75.9% good).
What is the 90th percentile AQI in Androscoggin County? ▼
The 90th percentile AQI for Androscoggin County is 54, meaning 90% of monitored days had an AQI at or below this level. The maximum AQI recorded was 112 (USG).
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 Androscoggin County, Maine · 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.