EnviroNearby

Cherokee County, Georgia air quality history

Daily Air Quality Index summaries from EPA monitors in Cherokee, Georgia, 1999–2002.

70%
Good days in 2002
44
Median daily AQI, 2002
26
Days above 100 in 2002
245
Days with an AQI in 2002 (of 365)

In 2002, EPA reported a daily Air Quality Index (AQI) for Cherokee, Georgia on 245 days. 171 of those days (70%) were in the Good range, and the median daily AQI was 44. That median is about the same as the typical monitored county in Georgia (median 44 across 22 counties), and about the same as the typical monitored U.S. county (44). The main pollutant was ozone on 245 days.

EPA did not report an AQI for every day of 2002 here (245 of 365 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 2002; EPA's files for 2003–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1999) 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%1999: Good 36 of 92 days1999: Moderate 34 of 92 days1999: Unhealthy for Sensitive Groups 19 of 92 days1999: Unhealthy 3 of 92 days19992000: Good 223 of 244 days2000: Moderate 18 of 244 days2000: Unhealthy for Sensitive Groups 3 of 244 days20002001: Good 149 of 223 days2001: Moderate 62 of 223 days2001: Unhealthy for Sensitive Groups 11 of 223 days2001: Unhealthy 1 of 223 days20012002: Good 171 of 245 days2002: Moderate 48 of 245 days2002: Unhealthy for Sensitive Groups 18 of 245 days2002: Unhealthy 7 of 245 days2002: Very Unhealthy 1 of 245 days2002
  • 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 year0501001501999: 90th percentile AQI 1222000: 90th percentile AQI 492001: 90th percentile AQI 902002: 90th percentile AQI 1051999: Median AQI 612000: Median AQI 332001: Median AQI 442002: Median AQI 441999200020012002
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2002

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
2002245171481871044105208Ozone
200122314962111004490154Ozone
20002442231830003349126Ozone
19999236341930061122187Ozone

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 Georgia

Source: U.S. EPA AirData, “Annual AQI by County” files for 1999–2002 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem