EnviroNearby

Lincoln County, Maine air quality history

Daily Air Quality Index summaries from EPA monitors in Lincoln, Maine, 1984–1985.

72%
Good days in 1985
42
Median daily AQI, 1985
20
Days above 100 in 1985
178
Days with an AQI in 1985 (of 365)

In 1985, EPA reported a daily Air Quality Index (AQI) for Lincoln, Maine on 178 days. 128 of those days (72%) were in the Good range, and the median daily AQI was 42. That median is higher than the typical monitored county in Maine (median 39 across 9 counties), and about the same as the typical monitored U.S. county (40.5). The main pollutant was ozone on 178 days.

EPA did not report an AQI for every day of 1985 here (178 of 365 days). Figures describe monitored days only; seasonal monitoring (for example, ozone measured only in warmer months) can make a county look cleaner or dirtier than a full-year record would.

The most recent year with data for this county is 1985; EPA's files for 1986–2025 contain no row for it, which usually means its monitors stopped reporting.

How the days broke down each year

Each bar is one year. The colored segments show the share of monitored days that fell in each AQI category.

Share of monitored days in each AQI category, by year0%25%50%75%100%1984: Good 129 of 175 days1984: Moderate 21 of 175 days1984: Unhealthy for Sensitive Groups 13 of 175 days1984: Unhealthy 12 of 175 days19841985: Good 128 of 178 days1985: Moderate 30 of 178 days1985: Unhealthy for Sensitive Groups 13 of 178 days1985: Unhealthy 5 of 178 days1985: Very Unhealthy 2 of 178 days1985
  • Good
  • Moderate
  • Unhealthy for Sensitive Groups
  • Unhealthy
  • Very Unhealthy
  • Hazardous

Typical and high-end AQI over time

The median is the middle day of the year. The 90th percentile is the level that only the highest 10% of days exceeded.

Median and 90th-percentile daily AQI, by year0501001501984: 90th percentile AQI 1191985: 90th percentile AQI 1081984: Median AQI 381985: Median AQI 4219841985
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 1985

On each monitored day, the AQI reflects whichever measured pollutant had the highest index. This counts how many days each pollutant set the AQI. A pollutant that was not measured here cannot appear.

PollutantDays as main pollutantShare of monitored days
Ozone178100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
1985178128301352042108207Ozone
19841751292113120038119200Ozone

What this data can and can’t tell you

It is a county-level summary. EPA reports one AQI per day for the county, based on the monitors operating there. Air at a particular street, school or home can differ, especially near roads, industry or wildfire smoke.

It is not a health assessment. The AQI is EPA’s scale for communicating daily air quality. A county’s history can’t tell you what the health risk is for any particular person. For daily conditions and health guidance, see AirNow.

Rules change over time. EPA has revised AQI breakpoints, most recently for fine particles in 2024, so some year-to-year change can reflect the scale rather than the air.

Counties in Maine with a similar median AQI in 1985

All monitored counties in Maine

Source: U.S. EPA AirData, “Annual AQI by County” files for 1984–1985 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem