EnviroNearby

Scott County, Kentucky air quality history

Daily Air Quality Index summaries from EPA monitors in Scott, Kentucky, 1993–2004.

95%
Good days in 2004
33
Median daily AQI, 2004
0
Days above 100 in 2004
239
Days with an AQI in 2004 (of 366)

In 2004, EPA reported a daily Air Quality Index (AQI) for Scott, Kentucky on 239 days. 226 of those days (95%) were in the Good range, and the median daily AQI was 33. That median is lower than the typical monitored county in Kentucky (median 42 across 32 counties), and lower than the typical monitored U.S. county (42). The main pollutant was ozone on 239 days. Across the years with fuller monitoring, the share of Good days rose: an average of 58% in 1993–1995 versus 89% in 2002–2004.

EPA did not report an AQI for every day of 2004 here (239 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 132 of 199 days1993: Moderate 57 of 199 days1993: Unhealthy for Sensitive Groups 9 of 199 days1993: Unhealthy 1 of 199 days19931994: Good 111 of 214 days1994: Moderate 68 of 214 days1994: Unhealthy for Sensitive Groups 26 of 214 days1994: Unhealthy 9 of 214 days19941995: Good 114 of 199 days1995: Moderate 58 of 199 days1995: Unhealthy for Sensitive Groups 22 of 199 days1995: Unhealthy 5 of 199 days19951996: Good 147 of 213 days1996: Moderate 55 of 213 days1996: Unhealthy for Sensitive Groups 10 of 213 days1996: Unhealthy 1 of 213 days19961997: Good 167 of 214 days1997: Moderate 42 of 214 days1997: Unhealthy for Sensitive Groups 5 of 214 days19971998: Good 150 of 213 days1998: Moderate 40 of 213 days1998: Unhealthy for Sensitive Groups 17 of 213 days1998: Unhealthy 6 of 213 days19981999: Good 113 of 214 days1999: Moderate 61 of 214 days1999: Unhealthy for Sensitive Groups 38 of 214 days1999: Unhealthy 2 of 214 days19992000: Good 185 of 220 days2000: Moderate 31 of 220 days2000: Unhealthy for Sensitive Groups 4 of 220 days20002001: Good 219 of 244 days2001: Moderate 25 of 244 days20012002: Good 205 of 245 days2002: Moderate 30 of 245 days2002: Unhealthy for Sensitive Groups 9 of 245 days2002: Unhealthy 1 of 245 days20022003: Good 214 of 245 days2003: Moderate 31 of 245 days20032004: Good 226 of 239 days2004: Moderate 13 of 239 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 871994: 90th percentile AQI 1191995: 90th percentile AQI 1121996: 90th percentile AQI 871997: 90th percentile AQI 771998: 90th percentile AQI 1011999: 90th percentile AQI 1122000: 90th percentile AQI 642001: 90th percentile AQI 512002: 90th percentile AQI 802003: 90th percentile AQI 582004: 90th percentile AQI 461993: Median AQI 441994: Median AQI 501995: Median AQI 471996: Median AQI 441997: Median AQI 411998: Median AQI 441999: Median AQI 502000: Median AQI 372001: Median AQI 352002: Median AQI 372003: Median AQI 372004: Median AQI 33199319941995199619971998199920002001200220032004
  • 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
Ozone239100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2004239226130000334667Ozone
20032452143100003758100Ozone
20022452053091003780151Ozone
20012442192500003551100Ozone
20002201853140003764119Ozone
1999214113613820050112190Ozone
1998213150401760044101197Ozone
19972141674250004177115Ozone
199621314755101004487151Ozone
1995199114582250047112185Ozone
1994214111682690050119197Ozone
19931991325791004487169Ozone

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 Kentucky with a similar median AQI in 2004

All monitored counties in Kentucky

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