EnviroNearby

Walker County, Georgia air quality history

Daily Air Quality Index summaries from EPA monitors in Walker, Georgia, 1997–2025.

53%
Good days in 2025
48
Median daily AQI, 2025
4
Days above 100 in 2025
365
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Walker, Georgia on 365 days. 195 of those days (53%) were in the Good range, and the median daily AQI was 48. That median is about the same as the typical monitored county in Georgia (median 46 across 25 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 365 days. Across the years with fuller monitoring, the share of Good days rose: an average of 26% in 2008–2010 versus 45% in 2023–2025.

Years with fewer than 120 monitored days (2002, 2003, 2004, 2005, 2006, 2007…) 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%1997: Good 47 of 49 days1997: Moderate 2 of 49 days19971998: Good 49 of 50 days1998: Moderate 1 of 50 days1999: Good 56 of 58 days1999: Moderate 2 of 58 days2000: Good 13 of 55 days2000: Moderate 39 of 55 days2000: Unhealthy for Sensitive Groups 3 of 55 days2001: Good 12 of 61 days2001: Moderate 49 of 61 days2002: Good 20 of 62 days2002: Moderate 42 of 62 days20022003: Good 14 of 63 days2003: Moderate 47 of 63 days2003: Unhealthy for Sensitive Groups 2 of 63 days2004: Good 16 of 62 days2004: Moderate 46 of 62 days2005: Good 9 of 63 days2005: Moderate 52 of 63 days2005: Unhealthy for Sensitive Groups 2 of 63 days2006: Good 13 of 63 days2006: Moderate 48 of 63 days2006: Unhealthy for Sensitive Groups 2 of 63 days2007: Good 20 of 102 days2007: Moderate 79 of 102 days2007: Unhealthy for Sensitive Groups 3 of 102 days20072008: Good 59 of 346 days2008: Moderate 285 of 346 days2008: Unhealthy for Sensitive Groups 2 of 346 days2009: Good 106 of 328 days2009: Moderate 221 of 328 days2009: Unhealthy 1 of 328 days2010: Good 97 of 351 days2010: Moderate 254 of 351 days2011: Good 75 of 355 days2011: Moderate 280 of 355 days2012: Good 103 of 329 days2012: Moderate 225 of 329 days2012: Unhealthy for Sensitive Groups 1 of 329 days20122013: Good 161 of 362 days2013: Moderate 201 of 362 days2014: Good 155 of 354 days2014: Moderate 199 of 354 days2015: Good 172 of 359 days2015: Moderate 187 of 359 days2016: Good 169 of 348 days2016: Moderate 176 of 348 days2016: Unhealthy 3 of 348 days2017: Good 150 of 308 days2017: Moderate 158 of 308 days20172018: Good 196 of 347 days2018: Moderate 151 of 347 days2019: Good 185 of 356 days2019: Moderate 171 of 356 days2020: Good 118 of 177 days2020: Moderate 59 of 177 days2021: Good 93 of 233 days2021: Moderate 139 of 233 days2021: Unhealthy for Sensitive Groups 1 of 233 days2022: Good 136 of 352 days2022: Moderate 216 of 352 days20222023: Good 129 of 362 days2023: Moderate 229 of 362 days2023: Unhealthy for Sensitive Groups 4 of 362 days2024: Good 165 of 363 days2024: Moderate 198 of 363 days2025: Good 195 of 365 days2025: Moderate 166 of 365 days2025: Unhealthy for Sensitive Groups 2 of 365 days2025: Unhealthy 2 of 365 days2025
  • 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 year0501001997: 90th percentile AQI 421998: 90th percentile AQI 401999: 90th percentile AQI 392000: 90th percentile AQI 812001: 90th percentile AQI 822002: 90th percentile AQI 782003: 90th percentile AQI 792004: 90th percentile AQI 802005: 90th percentile AQI 842006: 90th percentile AQI 822007: 90th percentile AQI 842008: 90th percentile AQI 782009: 90th percentile AQI 702010: 90th percentile AQI 732011: 90th percentile AQI 742012: 90th percentile AQI 692013: 90th percentile AQI 652014: 90th percentile AQI 652015: 90th percentile AQI 622016: 90th percentile AQI 622017: 90th percentile AQI 632018: 90th percentile AQI 612019: 90th percentile AQI 622020: 90th percentile AQI 582021: 90th percentile AQI 682022: 90th percentile AQI 682023: 90th percentile AQI 702024: 90th percentile AQI 662025: 90th percentile AQI 641997: Median AQI 221998: Median AQI 191999: Median AQI 222000: Median AQI 632001: Median AQI 582002: Median AQI 562003: Median AQI 612004: Median AQI 592005: Median AQI 632006: Median AQI 632007: Median AQI 592008: Median AQI 612009: Median AQI 552010: Median AQI 572011: Median AQI 592012: Median AQI 552013: Median AQI 522014: Median AQI 522015: Median AQI 512016: Median AQI 512017: Median AQI 512018: Median AQI 472019: Median AQI 492020: Median AQI 412021: Median AQI 532022: Median AQI 532023: Median AQI 532024: Median AQI 522025: Median AQI 481997200220072012201720222025
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2025

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
Fine particles (PM2.5)365100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
202536519516622004864181PM2.5
20243631651980000526698PM2.5
202336212922940005370145PM2.5
20223521362160000536889PM2.5
20212339313910005368110PM2.5
2020177118590000415886PM2.5
20193561851710000496284PM2.5
20183471961510000476175PM2.5
20173081501580000516385PM2.5
201634816917603005162183PM2.5
20153591721870000516282PM2.5
20143541551990000526584PM2.5
20133621612010000526598PM2.5
201232910322510005569122PM2.5
2011355752800000597496PM2.5
2010351972540000577396PM2.5
200932810622101005570155PM2.5
20083465928520006178102PM2.5
2007102207930005984127PM2.5
200663134820006382143PM2.5
20056395220006384104PM2.5
20046216460000598091PM2.5
200363144720006179129PM2.5
20026220420000567894PM2.5
20016112490000588297PM2.5
200055133930006381134PM2.5
1999585620000223958PM10
1998504910000194051PM10
1997494720000224252PM10

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 Georgia with a similar median AQI in 2025

All monitored counties in Georgia

Source: U.S. EPA AirData, “Annual AQI by County” files for 1997–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem