Bad Air Days in Sagadahoc County, Maine: under 1 a Year
under 1 bad air days a year
Rare: among the cleanest-air counties EPA monitors. Ranked 830 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly ozone: summer smog (0% particle days).
The bad-air season here
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in August. Averaged over 2016 to 2025.
What actually helps here
- Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
- On the odd bad day, check AirNow and keep windows shut.
The record for Sagadahoc
The worst recent year was 2025, with 1 bad day on 217 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2025-08-12 | 108 | Ozone |
| 2023-07-26 | 100 | Ozone |
| 2022-07-01 | 93 | Ozone |
| 2024-06-19 | 93 | Ozone |
| 2022-07-24 | 90 | Ozone |
An ordinary day in Sagadahoc
Across 796 monitored days from 2022 to 2025, the air in Sagadahoc County rated Good on 94% of them, more often than the 72% typical of monitored counties, and Moderate on 6%. The median day sat at AQI 35; one day in ten went above 47.
The pollutant setting the AQI on an ordinary day here:
- ozone100%796 days
Sagadahoc County by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 217 | 207 | 9 | 1 | 0 | 35 | 108 |
| 2024 | 202 | 190 | 12 | 0 | 0 | 35 | 93 |
| 2023 | 208 | 193 | 15 | 0 | 0 | 39 | 100 |
| 2022 | 169 | 159 | 10 | 0 | 0 | 32 | 93 |
| 2015 | 203 | 198 | 5 | 0 | 0 | 35 | 74 |
| 2014 | 187 | 180 | 7 | 0 | 0 | 31 | 80 |
| 2013 | 205 | 195 | 9 | 1 | 0 | 35 | 108 |
| 2012 | 210 | 201 | 9 | 0 | 0 | 36 | 90 |
| 2011 | 179 | 165 | 14 | 0 | 0 | 32 | 87 |
| 2010 | 213 | 201 | 11 | 1 | 0 | 38 | 101 |
*2025 may be a partial year in EPA's file.
Elsewhere in Maine
- York County2/yr
- Hancock County2/yr
- Cumberland County2/yr
- Aroostook County2/yr
- Knox County1/yr
- Penobscot Countyunder 1/yr
- Oxford Countyunder 1/yr
- Washington Countyunder 1/yr
How this is counted
A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day, and on why a purifier does not touch ozone in smoke vs ozone.