EnviroNearby

Coffee County, Tennessee air quality history

Daily Air Quality Index summaries from EPA monitors in Coffee, Tennessee, 1995–2005.

79%
Good days in 2004
41
Median daily AQI, 2004
2
Days above 100 in 2004
302
Days with an AQI in 2004 (of 366)

In 2004, EPA reported a daily Air Quality Index (AQI) for Coffee, Tennessee on 302 days. 240 of those days (79%) were in the Good range, and the median daily AQI was 41. That median is lower than the typical monitored county in Tennessee (median 46 across 23 counties), and about the same as the typical monitored U.S. county (42). The main pollutant was ozone on 296 days.

The most recent year with data for this county is 2005; EPA's files for 2006–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1996, 1999, 2005) are shown in the table but left out of comparisons and trend statements.

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%1995: Good 191 of 275 days1995: Moderate 76 of 275 days1995: Unhealthy for Sensitive Groups 8 of 275 days19951996: Good 96 of 100 days1996: Moderate 4 of 100 days19961998: Good 240 of 344 days1998: Moderate 81 of 344 days1998: Unhealthy for Sensitive Groups 21 of 344 days1998: Unhealthy 2 of 344 days19981999: Good 13 of 13 days19992004: Good 240 of 302 days2004: Moderate 60 of 302 days2004: Unhealthy for Sensitive Groups 2 of 302 days20042005: Good 59 of 59 days2005
  • 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 year0501001995: 90th percentile AQI 871996: 90th percentile AQI 471998: 90th percentile AQI 931999: 90th percentile AQI 332004: 90th percentile AQI 672005: 90th percentile AQI 391995: Median AQI 421996: Median AQI 311998: Median AQI 431999: Median AQI 282004: Median AQI 412005: Median AQI 31199519961998199920042005
  • 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
Ozone29698%
Nitrogen dioxide (NO₂)62%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2005595900000313947Ozone
20043022406020004167115Ozone
1999131300000283334Ozone
199834424081212004393164Ozone
199610096400003147100Ozone
19952751917680004287140Ozone

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 Tennessee

Source: U.S. EPA AirData, “Annual AQI by County” files for 1995–2005 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem