EnviroNearby

Haywood County, Tennessee air quality history

Daily Air Quality Index summaries from EPA monitors in Haywood, Tennessee, 1993–2008.

79%
Good days in 2008
43
Median daily AQI, 2008
0
Days above 100 in 2008
229
Days with an AQI in 2008 (of 366)

In 2008, EPA reported a daily Air Quality Index (AQI) for Haywood, Tennessee on 229 days. 180 of those days (79%) were in the Good range, and the median daily AQI was 43. That median is lower than the typical monitored county in Tennessee (median 46 across 21 counties), and about the same as the typical monitored U.S. county (44). The main pollutant was ozone on 229 days. Across the years with fuller monitoring, the share of Good days rose: an average of 59% in 1993–1995 versus 80% in 2006–2008.

EPA did not report an AQI for every day of 2008 here (229 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 2008; EPA's files for 2009–2025 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 207 of 320 days1993: Moderate 83 of 320 days1993: Unhealthy for Sensitive Groups 26 of 320 days1993: Unhealthy 3 of 320 days1993: Very Unhealthy 1 of 320 days19931994: Good 144 of 248 days1994: Moderate 78 of 248 days1994: Unhealthy for Sensitive Groups 21 of 248 days1994: Unhealthy 5 of 248 days19941995: Good 97 of 181 days1995: Moderate 66 of 181 days1995: Unhealthy for Sensitive Groups 17 of 181 days1995: Unhealthy 1 of 181 days19951996: Good 104 of 214 days1996: Moderate 76 of 214 days1996: Unhealthy for Sensitive Groups 31 of 214 days1996: Unhealthy 3 of 214 days19961997: Good 108 of 205 days1997: Moderate 70 of 205 days1997: Unhealthy for Sensitive Groups 25 of 205 days1997: Unhealthy 2 of 205 days19971998: Good 140 of 288 days1998: Moderate 91 of 288 days1998: Unhealthy for Sensitive Groups 48 of 288 days1998: Unhealthy 7 of 288 days1998: Very Unhealthy 2 of 288 days19981999: Good 100 of 230 days1999: Moderate 80 of 230 days1999: Unhealthy for Sensitive Groups 34 of 230 days1999: Unhealthy 16 of 230 days19992000: Good 110 of 222 days2000: Moderate 66 of 222 days2000: Unhealthy for Sensitive Groups 38 of 222 days2000: Unhealthy 8 of 222 days20002001: Good 148 of 242 days2001: Moderate 77 of 242 days2001: Unhealthy for Sensitive Groups 15 of 242 days2001: Unhealthy 2 of 242 days20012002: Good 223 of 298 days2002: Moderate 51 of 298 days2002: Unhealthy for Sensitive Groups 21 of 298 days2002: Unhealthy 3 of 298 days20022003: Good 202 of 304 days2003: Moderate 89 of 304 days2003: Unhealthy for Sensitive Groups 12 of 304 days2003: Unhealthy 1 of 304 days20032006: Good 240 of 305 days2006: Moderate 50 of 305 days2006: Unhealthy for Sensitive Groups 12 of 305 days2006: Unhealthy 2 of 305 days2006: Very Unhealthy 1 of 305 days20062007: Good 98 of 120 days2007: Moderate 20 of 120 days2007: Unhealthy for Sensitive Groups 2 of 120 days20072008: Good 180 of 229 days2008: Moderate 49 of 229 days2008
  • 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 1001994: 90th percentile AQI 1011995: 90th percentile AQI 1001996: 90th percentile AQI 1191997: 90th percentile AQI 1051998: 90th percentile AQI 1261999: 90th percentile AQI 1402000: 90th percentile AQI 1192001: 90th percentile AQI 902002: 90th percentile AQI 932003: 90th percentile AQI 802006: 90th percentile AQI 842007: 90th percentile AQI 672008: 90th percentile AQI 671993: Median AQI 441994: Median AQI 451995: Median AQI 501996: Median AQI 511997: Median AQI 491998: Median AQI 511999: Median AQI 642000: Median AQI 512001: Median AQI 462002: Median AQI 382003: Median AQI 442006: Median AQI 392007: Median AQI 392008: Median AQI 4319931994199519961997199819992000200120022003200620072008
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2008

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
Ozone229100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2008229180490000436793Ozone
2007120982020003967122Ozone
200630524050122103984203Ozone
200330420289121004480166Ozone
200229822351213003893177Ozone
200124214877152004690161Ozone
2000222110663880051119187Ozone
19992301008034160064140192Ozone
1998288140914872051126205Ozone
1997205108702520049105151Ozone
1996214104763130051119174Ozone
199518197661710050100164Ozone
1994248144782150045101192Ozone
1993320207832631044100205Ozone

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 1993–2008 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem