EnviroNearby

DeKalb County, Georgia air quality history

Daily Air Quality Index summaries from EPA monitors in DeKalb, Georgia, 1980–2025.

58%
Good days in 2025
47
Median daily AQI, 2025
0
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 DeKalb, Georgia on 365 days. 213 of those days (58%) were in the Good range, and the median daily AQI was 47. 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 259 days. Across the years with fuller monitoring, the share of Good days fell: an average of 75% in 1980–1982 versus 48% in 2023–2025.

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%1980: Good 247 of 335 days1980: Moderate 62 of 335 days1980: Unhealthy for Sensitive Groups 18 of 335 days1980: Unhealthy 5 of 335 days1980: Very Unhealthy 3 of 335 days19801981: Good 275 of 362 days1981: Moderate 59 of 362 days1981: Unhealthy for Sensitive Groups 17 of 362 days1981: Unhealthy 8 of 362 days1981: Very Unhealthy 3 of 362 days1982: Good 271 of 365 days1982: Moderate 75 of 365 days1982: Unhealthy for Sensitive Groups 15 of 365 days1982: Unhealthy 4 of 365 days1983: Good 246 of 365 days1983: Moderate 70 of 365 days1983: Unhealthy for Sensitive Groups 26 of 365 days1983: Unhealthy 11 of 365 days1983: Very Unhealthy 12 of 365 days1984: Good 259 of 365 days1984: Moderate 83 of 365 days1984: Unhealthy for Sensitive Groups 16 of 365 days1984: Unhealthy 5 of 365 days1984: Very Unhealthy 2 of 365 days1985: Good 282 of 362 days1985: Moderate 55 of 362 days1985: Unhealthy for Sensitive Groups 16 of 362 days1985: Unhealthy 9 of 362 days19851986: Good 225 of 365 days1986: Moderate 78 of 365 days1986: Unhealthy for Sensitive Groups 34 of 365 days1986: Unhealthy 20 of 365 days1986: Very Unhealthy 8 of 365 days1987: Good 215 of 365 days1987: Moderate 85 of 365 days1987: Unhealthy for Sensitive Groups 35 of 365 days1987: Unhealthy 22 of 365 days1987: Very Unhealthy 8 of 365 days1988: Good 228 of 366 days1988: Moderate 83 of 366 days1988: Unhealthy for Sensitive Groups 30 of 366 days1988: Unhealthy 14 of 366 days1988: Very Unhealthy 11 of 366 days1989: Good 258 of 365 days1989: Moderate 77 of 365 days1989: Unhealthy for Sensitive Groups 26 of 365 days1989: Unhealthy 4 of 365 days1990: Good 222 of 365 days1990: Moderate 83 of 365 days1990: Unhealthy for Sensitive Groups 35 of 365 days1990: Unhealthy 20 of 365 days1990: Very Unhealthy 5 of 365 days19901991: Good 270 of 365 days1991: Moderate 67 of 365 days1991: Unhealthy for Sensitive Groups 21 of 365 days1991: Unhealthy 6 of 365 days1991: Very Unhealthy 1 of 365 days1992: Good 284 of 362 days1992: Moderate 61 of 362 days1992: Unhealthy for Sensitive Groups 12 of 362 days1992: Unhealthy 4 of 362 days1992: Very Unhealthy 1 of 362 days1993: Good 250 of 365 days1993: Moderate 72 of 365 days1993: Unhealthy for Sensitive Groups 28 of 365 days1993: Unhealthy 11 of 365 days1993: Very Unhealthy 4 of 365 days1994: Good 293 of 365 days1994: Moderate 58 of 365 days1994: Unhealthy for Sensitive Groups 9 of 365 days1994: Unhealthy 5 of 365 days1995: Good 237 of 365 days1995: Moderate 65 of 365 days1995: Unhealthy for Sensitive Groups 38 of 365 days1995: Unhealthy 19 of 365 days1995: Very Unhealthy 6 of 365 days19951996: Good 247 of 366 days1996: Moderate 76 of 366 days1996: Unhealthy for Sensitive Groups 23 of 366 days1996: Unhealthy 17 of 366 days1996: Very Unhealthy 3 of 366 days1997: Good 267 of 365 days1997: Moderate 64 of 365 days1997: Unhealthy for Sensitive Groups 25 of 365 days1997: Unhealthy 9 of 365 days1998: Good 228 of 365 days1998: Moderate 73 of 365 days1998: Unhealthy for Sensitive Groups 38 of 365 days1998: Unhealthy 20 of 365 days1998: Very Unhealthy 6 of 365 days1999: Good 29 of 365 days1999: Moderate 253 of 365 days1999: Unhealthy for Sensitive Groups 47 of 365 days1999: Unhealthy 27 of 365 days1999: Very Unhealthy 9 of 365 days2000: Good 26 of 366 days2000: Moderate 272 of 366 days2000: Unhealthy for Sensitive Groups 49 of 366 days2000: Unhealthy 13 of 366 days2000: Very Unhealthy 6 of 366 days20002001: Good 46 of 365 days2001: Moderate 270 of 365 days2001: Unhealthy for Sensitive Groups 37 of 365 days2001: Unhealthy 12 of 365 days2002: Good 40 of 365 days2002: Moderate 279 of 365 days2002: Unhealthy for Sensitive Groups 35 of 365 days2002: Unhealthy 10 of 365 days2002: Very Unhealthy 1 of 365 days2003: Good 59 of 365 days2003: Moderate 278 of 365 days2003: Unhealthy for Sensitive Groups 23 of 365 days2003: Unhealthy 5 of 365 days2004: Good 49 of 366 days2004: Moderate 294 of 366 days2004: Unhealthy for Sensitive Groups 19 of 366 days2004: Unhealthy 3 of 366 days2004: Very Unhealthy 1 of 366 days2005: Good 55 of 365 days2005: Moderate 276 of 365 days2005: Unhealthy for Sensitive Groups 30 of 365 days2005: Unhealthy 4 of 365 days20052006: Good 56 of 365 days2006: Moderate 261 of 365 days2006: Unhealthy for Sensitive Groups 36 of 365 days2006: Unhealthy 11 of 365 days2006: Very Unhealthy 1 of 365 days2007: Good 56 of 365 days2007: Moderate 269 of 365 days2007: Unhealthy for Sensitive Groups 24 of 365 days2007: Unhealthy 15 of 365 days2007: Very Unhealthy 1 of 365 days2008: Good 66 of 366 days2008: Moderate 277 of 366 days2008: Unhealthy for Sensitive Groups 19 of 366 days2008: Unhealthy 4 of 366 days2009: Good 100 of 365 days2009: Moderate 255 of 365 days2009: Unhealthy for Sensitive Groups 10 of 365 days2010: Good 66 of 365 days2010: Moderate 288 of 365 days2010: Unhealthy for Sensitive Groups 9 of 365 days2010: Unhealthy 2 of 365 days20102011: Good 84 of 365 days2011: Moderate 263 of 365 days2011: Unhealthy for Sensitive Groups 16 of 365 days2011: Unhealthy 2 of 365 days2012: Good 87 of 366 days2012: Moderate 266 of 366 days2012: Unhealthy for Sensitive Groups 10 of 366 days2012: Unhealthy 3 of 366 days2013: Good 114 of 365 days2013: Moderate 250 of 365 days2013: Unhealthy for Sensitive Groups 1 of 365 days2014: Good 86 of 365 days2014: Moderate 276 of 365 days2014: Unhealthy for Sensitive Groups 3 of 365 days2015: Good 111 of 365 days2015: Moderate 250 of 365 days2015: Unhealthy for Sensitive Groups 4 of 365 days20152016: Good 107 of 366 days2016: Moderate 250 of 366 days2016: Unhealthy for Sensitive Groups 8 of 366 days2016: Unhealthy 1 of 366 days2017: Good 174 of 365 days2017: Moderate 190 of 365 days2017: Unhealthy for Sensitive Groups 1 of 365 days2018: Good 195 of 365 days2018: Moderate 170 of 365 days2019: Good 173 of 365 days2019: Moderate 188 of 365 days2019: Unhealthy for Sensitive Groups 3 of 365 days2019: Unhealthy 1 of 365 days2020: Good 215 of 366 days2020: Moderate 150 of 366 days2020: Unhealthy for Sensitive Groups 1 of 366 days20202021: Good 190 of 365 days2021: Moderate 173 of 365 days2021: Unhealthy for Sensitive Groups 2 of 365 days2022: Good 177 of 365 days2022: Moderate 186 of 365 days2022: Unhealthy for Sensitive Groups 2 of 365 days2023: Good 140 of 365 days2023: Moderate 218 of 365 days2023: Unhealthy for Sensitive Groups 7 of 365 days2024: Good 178 of 366 days2024: Moderate 182 of 366 days2024: Unhealthy for Sensitive Groups 6 of 366 days2025: Good 213 of 365 days2025: Moderate 152 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 year0501001501980: 90th percentile AQI 971981: 90th percentile AQI 901982: 90th percentile AQI 841983: 90th percentile AQI 1151984: 90th percentile AQI 841985: 90th percentile AQI 901986: 90th percentile AQI 1261987: 90th percentile AQI 1401988: 90th percentile AQI 1261989: 90th percentile AQI 931990: 90th percentile AQI 1291991: 90th percentile AQI 931992: 90th percentile AQI 741993: 90th percentile AQI 1051994: 90th percentile AQI 691995: 90th percentile AQI 1331996: 90th percentile AQI 1081997: 90th percentile AQI 971998: 90th percentile AQI 1291999: 90th percentile AQI 1502000: 90th percentile AQI 1332001: 90th percentile AQI 1122002: 90th percentile AQI 1062003: 90th percentile AQI 932004: 90th percentile AQI 902005: 90th percentile AQI 1002006: 90th percentile AQI 1112007: 90th percentile AQI 1052008: 90th percentile AQI 872009: 90th percentile AQI 742010: 90th percentile AQI 802011: 90th percentile AQI 852012: 90th percentile AQI 762013: 90th percentile AQI 692014: 90th percentile AQI 732015: 90th percentile AQI 722016: 90th percentile AQI 742017: 90th percentile AQI 662018: 90th percentile AQI 632019: 90th percentile AQI 672020: 90th percentile AQI 612021: 90th percentile AQI 662022: 90th percentile AQI 652023: 90th percentile AQI 702024: 90th percentile AQI 672025: 90th percentile AQI 611980: Median AQI 311981: Median AQI 351982: Median AQI 371983: Median AQI 421984: Median AQI 401985: Median AQI 331986: Median AQI 431987: Median AQI 461988: Median AQI 441989: Median AQI 411990: Median AQI 421991: Median AQI 401992: Median AQI 361993: Median AQI 411994: Median AQI 361995: Median AQI 431996: Median AQI 431997: Median AQI 401998: Median AQI 411999: Median AQI 742000: Median AQI 702001: Median AQI 662002: Median AQI 642003: Median AQI 622004: Median AQI 652005: Median AQI 632006: Median AQI 652007: Median AQI 652008: Median AQI 602009: Median AQI 572010: Median AQI 612011: Median AQI 582012: Median AQI 612013: Median AQI 552014: Median AQI 562015: Median AQI 562016: Median AQI 572017: Median AQI 512018: Median AQI 492019: Median AQI 522020: Median AQI 462021: Median AQI 492022: Median AQI 512023: Median AQI 532024: Median AQI 512025: Median AQI 471980198519901995200020052010201520202025
  • 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)25971%
Ozone7521%
Nitrogen dioxide (NO₂)318%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652131520000476190PM2.5
202436617818260005167133PM2.5
202336514021870005370136PM2.5
202236517718620005165147PM2.5
202136519017320004966119PM2.5
202036621515010004661106PM2.5
201936517318831005267159PM2.5
201836519517000004963100PM2.5
201736517419010005166143PM2.5
201636610725081005774151PM2.5
201536511125040005672150PM2.5
20143658627630005673122PM2.5
201336511425010005569140PM2.5
201236687266103006176185PM2.5
201136584263162005885172PM2.5
20103656628892006180182PM2.5
2009365100255100005774143PM2.5
200836666277194006087182PM2.5
20073655626924151065105220PM2.5
20063655626136111065111217PM2.5
2005365552763040063100197PM2.5
200436649294193106590207PM2.5
200336559278235006293195PM2.5
20023654027935101064106216PM2.5
20013654627037120066112195PM2.5
20003662627249136070133233PM2.5
19993652925347279074150229PM2.5
19983652287338206041129213Ozone
199736526764259004097190NO2
19963662477623173043108215Ozone
19953652376538196043133225Ozone
19943652935895003669182Ozone
19933652507228114041105235Ozone
199236228461124103674205Ozone
199136527067216104093205Ozone
19903652228335205042129220Ozone
198936525877264004193187Ozone
198836622883301411044126247Ozone
19873652158535228046140237Ozone
19863652257834208043126245Ozone
198536228255169003390190Ozone
198436525983165204084206Ozone
198336524670261112042115246Ozone
198236527175154003784200Ozone
198136227559178303590209Ozone
198033524762185303197223Ozone

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 1980–2025 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem