EnviroNearby

MOBILE MONITORS County, Maine air quality history

Daily Air Quality Index summaries from EPA monitors in MOBILE MONITORS, Maine, 1993–2004.

89%
Good days in 2004
36
Median daily AQI, 2004
3
Days above 100 in 2004
127
Days with an AQI in 2004 (of 366)

In 2004, EPA reported a daily Air Quality Index (AQI) for MOBILE MONITORS, Maine on 127 days. 113 of those days (89%) were in the Good range, and the median daily AQI was 36. That median is about the same as the typical monitored county in Maine (median 34.5 across 12 counties), and lower than the typical monitored U.S. county (42). The main pollutant was ozone on 127 days. Across the years with fuller monitoring, the share of Good days rose: an average of 69% in 1993–1995 versus 81% in 2002–2004.

EPA did not report an AQI for every day of 2004 here (127 of 366 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 2004; EPA's files for 2005–2025 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%1993: Good 113 of 158 days1993: Moderate 31 of 158 days1993: Unhealthy for Sensitive Groups 9 of 158 days1993: Unhealthy 5 of 158 days19931994: Good 97 of 159 days1994: Moderate 41 of 159 days1994: Unhealthy for Sensitive Groups 16 of 159 days1994: Unhealthy 5 of 159 days19941995: Good 112 of 153 days1995: Moderate 23 of 153 days1995: Unhealthy for Sensitive Groups 10 of 153 days1995: Unhealthy 6 of 153 days1995: Very Unhealthy 2 of 153 days19951996: Good 100 of 150 days1996: Moderate 34 of 150 days1996: Unhealthy for Sensitive Groups 13 of 150 days1996: Unhealthy 3 of 150 days19961997: Good 105 of 166 days1997: Moderate 42 of 166 days1997: Unhealthy for Sensitive Groups 12 of 166 days1997: Unhealthy 6 of 166 days1997: Very Unhealthy 1 of 166 days19971998: Good 93 of 148 days1998: Moderate 37 of 148 days1998: Unhealthy for Sensitive Groups 12 of 148 days1998: Unhealthy 6 of 148 days19981999: Good 113 of 153 days1999: Moderate 27 of 153 days1999: Unhealthy for Sensitive Groups 10 of 153 days1999: Unhealthy 2 of 153 days1999: Very Unhealthy 1 of 153 days19992000: Good 119 of 144 days2000: Moderate 20 of 144 days2000: Unhealthy for Sensitive Groups 5 of 144 days20002001: Good 95 of 137 days2001: Moderate 26 of 137 days2001: Unhealthy for Sensitive Groups 13 of 137 days2001: Unhealthy 3 of 137 days20012002: Good 114 of 153 days2002: Moderate 26 of 153 days2002: Unhealthy for Sensitive Groups 6 of 153 days2002: Unhealthy 7 of 153 days20022003: Good 107 of 137 days2003: Moderate 21 of 137 days2003: Unhealthy for Sensitive Groups 8 of 137 days2003: Unhealthy 1 of 137 days20032004: Good 113 of 127 days2004: Moderate 11 of 127 days2004: Unhealthy for Sensitive Groups 3 of 127 days2004
  • 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 year0501001501993: 90th percentile AQI 971994: 90th percentile AQI 1151995: 90th percentile AQI 1121996: 90th percentile AQI 1011997: 90th percentile AQI 1051998: 90th percentile AQI 1051999: 90th percentile AQI 902000: 90th percentile AQI 742001: 90th percentile AQI 1082002: 90th percentile AQI 932003: 90th percentile AQI 842004: 90th percentile AQI 581993: Median AQI 401994: Median AQI 461995: Median AQI 401996: Median AQI 441997: Median AQI 451998: Median AQI 471999: Median AQI 422000: Median AQI 382001: Median AQI 412002: Median AQI 422003: Median AQI 372004: Median AQI 36199319941995199619971998199920002001200220032004
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2004

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
Ozone127100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20041271131130003658133Ozone
20031371072181003784159Ozone
20021531142667004293185Ozone
200113795261330041108192Ozone
20001441192050003874129Ozone
199915311327102104290208Ozone
199814893371260047105177Ozone
1997166105421261045105210Ozone
1996150100341330044101169Ozone
1995153112231062040112210Ozone
199415997411650046115187Ozone
19931581133195004097179Ozone

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.

All monitored counties in Maine

Source: U.S. EPA AirData, “Annual AQI by County” files for 1993–2004 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem