EnviroNearby

Graves County, Kentucky air quality history

Daily Air Quality Index summaries from EPA monitors in Graves, Kentucky, 1991–2004.

85%
Good days in 2004
39
Median daily AQI, 2004
1
Days above 100 in 2004
245
Days with an AQI in 2004 (of 366)

In 2004, EPA reported a daily Air Quality Index (AQI) for Graves, Kentucky on 245 days. 209 of those days (85%) were in the Good range, and the median daily AQI was 39. 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 245 days. Across the years with fuller monitoring, the share of Good days fell: an average of 81% in 1991–1993 versus 75% in 2002–2004.

EPA did not report an AQI for every day of 2004 here (245 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%1991: Good 161 of 211 days1991: Moderate 43 of 211 days1991: Unhealthy for Sensitive Groups 6 of 211 days1991: Unhealthy 1 of 211 days19911992: Good 182 of 211 days1992: Moderate 29 of 211 days19921993: Good 172 of 214 days1993: Moderate 37 of 214 days1993: Unhealthy for Sensitive Groups 5 of 214 days19931994: Good 115 of 145 days1994: Moderate 27 of 145 days1994: Unhealthy for Sensitive Groups 3 of 145 days19941995: Good 159 of 214 days1995: Moderate 52 of 214 days1995: Unhealthy for Sensitive Groups 3 of 214 days19951996: Good 159 of 209 days1996: Moderate 44 of 209 days1996: Unhealthy for Sensitive Groups 5 of 209 days1996: Unhealthy 1 of 209 days19961997: Good 153 of 208 days1997: Moderate 45 of 208 days1997: Unhealthy for Sensitive Groups 8 of 208 days1997: Unhealthy 2 of 208 days19971998: Good 98 of 208 days1998: Moderate 76 of 208 days1998: Unhealthy for Sensitive Groups 30 of 208 days1998: Unhealthy 4 of 208 days19981999: Good 91 of 214 days1999: Moderate 72 of 214 days1999: Unhealthy for Sensitive Groups 39 of 214 days1999: Unhealthy 10 of 214 days1999: Very Unhealthy 2 of 214 days19992000: Good 147 of 243 days2000: Moderate 79 of 243 days2000: Unhealthy for Sensitive Groups 14 of 243 days2000: Unhealthy 2 of 243 days2000: Very Unhealthy 1 of 243 days20002001: Good 190 of 244 days2001: Moderate 48 of 244 days2001: Unhealthy for Sensitive Groups 6 of 244 days20012002: Good 182 of 245 days2002: Moderate 35 of 245 days2002: Unhealthy for Sensitive Groups 22 of 245 days2002: Unhealthy 6 of 245 days20022003: Good 160 of 245 days2003: Moderate 74 of 245 days2003: Unhealthy for Sensitive Groups 10 of 245 days2003: Unhealthy 1 of 245 days20032004: Good 209 of 245 days2004: Moderate 35 of 245 days2004: Unhealthy for Sensitive Groups 1 of 245 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 year0501001501991: 90th percentile AQI 801992: 90th percentile AQI 541993: 90th percentile AQI 671994: 90th percentile AQI 711995: 90th percentile AQI 841996: 90th percentile AQI 741997: 90th percentile AQI 801998: 90th percentile AQI 1191999: 90th percentile AQI 1332000: 90th percentile AQI 902001: 90th percentile AQI 672002: 90th percentile AQI 1052003: 90th percentile AQI 842004: 90th percentile AQI 541991: Median AQI 421992: Median AQI 391993: Median AQI 381994: Median AQI 411995: Median AQI 441996: Median AQI 431997: Median AQI 401998: Median AQI 511999: Median AQI 642000: Median AQI 462001: Median AQI 392002: Median AQI 412003: Median AQI 442004: Median AQI 3919911992199319941995199619971998199920002001200220032004
  • 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
Ozone245100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20042452093510003954108Ozone
200324516074101004484154Ozone
2002245182352260041105182Ozone
20012441904860003967126Ozone
200024314779142104690210Ozone
1999214917239102064133205Ozone
199820898763040051119187Ozone
19972081534582004080156Ozone
19962091594451004374151Ozone
19952141595230004484126Ozone
19941451152730004171143Ozone
19932141723750003867133Ozone
1992211182290000395497Ozone
19912111614361004280161Ozone

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 1991–2004 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem