EnviroNearby

Edgefield County, South Carolina air quality history

Daily Air Quality Index summaries from EPA monitors in Edgefield, South Carolina, 1980–2025.

68%
Good days in 2025
43
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 Edgefield, South Carolina on 365 days. 248 of those days (68%) were in the Good range, and the median daily AQI was 43. That median is about the same as the typical monitored county in South Carolina (median 43 across 13 counties), and higher than the typical monitored U.S. county (40). The main pollutant was fine particles (PM2.5) on 228 days. Across the years with fuller monitoring, the share of Good days held roughly steady: an average of 65% in 1980–1982 versus 64% 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 95 of 192 days1980: Moderate 49 of 192 days1980: Unhealthy for Sensitive Groups 39 of 192 days1980: Unhealthy 9 of 192 days19801981: Good 206 of 281 days1981: Moderate 52 of 281 days1981: Unhealthy for Sensitive Groups 23 of 281 days1982: Good 238 of 327 days1982: Moderate 65 of 327 days1982: Unhealthy for Sensitive Groups 22 of 327 days1982: Unhealthy 2 of 327 days1983: Good 210 of 311 days1983: Moderate 62 of 311 days1983: Unhealthy for Sensitive Groups 27 of 311 days1983: Unhealthy 11 of 311 days1983: Very Unhealthy 1 of 311 days1984: Good 257 of 346 days1984: Moderate 68 of 346 days1984: Unhealthy for Sensitive Groups 21 of 346 days1985: Good 253 of 340 days1985: Moderate 65 of 340 days1985: Unhealthy for Sensitive Groups 21 of 340 days1985: Unhealthy 1 of 340 days19851986: Good 216 of 264 days1986: Moderate 35 of 264 days1986: Unhealthy for Sensitive Groups 13 of 264 days1987: Good 218 of 309 days1987: Moderate 65 of 309 days1987: Unhealthy for Sensitive Groups 25 of 309 days1987: Unhealthy 1 of 309 days1988: Good 210 of 327 days1988: Moderate 69 of 327 days1988: Unhealthy for Sensitive Groups 35 of 327 days1988: Unhealthy 12 of 327 days1988: Very Unhealthy 1 of 327 days1989: Good 252 of 294 days1989: Moderate 37 of 294 days1989: Unhealthy for Sensitive Groups 5 of 294 days1990: Good 249 of 353 days1990: Moderate 81 of 353 days1990: Unhealthy for Sensitive Groups 20 of 353 days1990: Unhealthy 3 of 353 days19901991: Good 300 of 344 days1991: Moderate 42 of 344 days1991: Unhealthy for Sensitive Groups 2 of 344 days1992: Good 281 of 321 days1992: Moderate 33 of 321 days1992: Unhealthy for Sensitive Groups 7 of 321 days1993: Good 249 of 358 days1993: Moderate 91 of 358 days1993: Unhealthy for Sensitive Groups 15 of 358 days1993: Unhealthy 3 of 358 days1994: Good 305 of 361 days1994: Moderate 50 of 361 days1994: Unhealthy for Sensitive Groups 5 of 361 days1994: Unhealthy 1 of 361 days1995: Good 276 of 353 days1995: Moderate 67 of 353 days1995: Unhealthy for Sensitive Groups 10 of 353 days19951996: Good 286 of 362 days1996: Moderate 68 of 362 days1996: Unhealthy for Sensitive Groups 8 of 362 days1997: Good 274 of 360 days1997: Moderate 68 of 360 days1997: Unhealthy for Sensitive Groups 17 of 360 days1997: Unhealthy 1 of 360 days1998: Good 220 of 360 days1998: Moderate 90 of 360 days1998: Unhealthy for Sensitive Groups 41 of 360 days1998: Unhealthy 8 of 360 days1998: Very Unhealthy 1 of 360 days1999: Good 214 of 359 days1999: Moderate 112 of 359 days1999: Unhealthy for Sensitive Groups 28 of 359 days1999: Unhealthy 5 of 359 days2000: Good 190 of 358 days2000: Moderate 148 of 358 days2000: Unhealthy for Sensitive Groups 19 of 358 days2000: Unhealthy 1 of 358 days20002001: Good 220 of 346 days2001: Moderate 112 of 346 days2001: Unhealthy for Sensitive Groups 14 of 346 days2002: Good 221 of 362 days2002: Moderate 112 of 362 days2002: Unhealthy for Sensitive Groups 21 of 362 days2002: Unhealthy 8 of 362 days2003: Good 263 of 357 days2003: Moderate 93 of 357 days2003: Unhealthy for Sensitive Groups 1 of 357 days2004: Good 255 of 363 days2004: Moderate 102 of 363 days2004: Unhealthy for Sensitive Groups 5 of 363 days2004: Unhealthy 1 of 363 days2005: Good 216 of 332 days2005: Moderate 110 of 332 days2005: Unhealthy for Sensitive Groups 6 of 332 days20052006: Good 250 of 360 days2006: Moderate 109 of 360 days2006: Unhealthy for Sensitive Groups 1 of 360 days2007: Good 225 of 364 days2007: Moderate 132 of 364 days2007: Unhealthy for Sensitive Groups 7 of 364 days2008: Good 223 of 334 days2008: Moderate 106 of 334 days2008: Unhealthy for Sensitive Groups 4 of 334 days2008: Unhealthy 1 of 334 days2009: Good 278 of 363 days2009: Moderate 85 of 363 days2010: Good 257 of 353 days2010: Moderate 96 of 353 days20102011: Good 177 of 338 days2011: Moderate 160 of 338 days2011: Unhealthy for Sensitive Groups 1 of 338 days2012: Good 182 of 332 days2012: Moderate 150 of 332 days2013: Good 232 of 325 days2013: Moderate 93 of 325 days2014: Good 192 of 276 days2014: Moderate 84 of 276 days2015: Good 241 of 291 days2015: Moderate 49 of 291 days2015: Unhealthy for Sensitive Groups 1 of 291 days20152016: Good 224 of 347 days2016: Moderate 118 of 347 days2016: Unhealthy for Sensitive Groups 3 of 347 days2016: Unhealthy 2 of 347 days2017: Good 234 of 344 days2017: Moderate 110 of 344 days2018: Good 250 of 330 days2018: Moderate 80 of 330 days2019: Good 234 of 361 days2019: Moderate 127 of 361 days2020: Good 307 of 366 days2020: Moderate 58 of 366 days2020: Unhealthy for Sensitive Groups 1 of 366 days20202021: Good 261 of 354 days2021: Moderate 93 of 354 days2022: Good 250 of 364 days2022: Moderate 114 of 364 days2023: Good 217 of 365 days2023: Moderate 148 of 365 days2024: Good 231 of 365 days2024: Moderate 134 of 365 days2025: Good 248 of 365 days2025: Moderate 117 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 1291981: 90th percentile AQI 931982: 90th percentile AQI 901983: 90th percentile AQI 1051984: 90th percentile AQI 871985: 90th percentile AQI 841986: 90th percentile AQI 771987: 90th percentile AQI 971988: 90th percentile AQI 1151989: 90th percentile AQI 611990: 90th percentile AQI 931991: 90th percentile AQI 581992: 90th percentile AQI 581993: 90th percentile AQI 901994: 90th percentile AQI 641995: 90th percentile AQI 841996: 90th percentile AQI 671997: 90th percentile AQI 871998: 90th percentile AQI 1121999: 90th percentile AQI 1002000: 90th percentile AQI 872001: 90th percentile AQI 842002: 90th percentile AQI 932003: 90th percentile AQI 652004: 90th percentile AQI 712005: 90th percentile AQI 752006: 90th percentile AQI 702007: 90th percentile AQI 712008: 90th percentile AQI 702009: 90th percentile AQI 592010: 90th percentile AQI 622011: 90th percentile AQI 712012: 90th percentile AQI 612013: 90th percentile AQI 572014: 90th percentile AQI 572015: 90th percentile AQI 542016: 90th percentile AQI 612017: 90th percentile AQI 582018: 90th percentile AQI 562019: 90th percentile AQI 572020: 90th percentile AQI 532021: 90th percentile AQI 592022: 90th percentile AQI 572023: 90th percentile AQI 642024: 90th percentile AQI 612025: 90th percentile AQI 601980: Median AQI 541981: Median AQI 391982: Median AQI 391983: Median AQI 411984: Median AQI 401985: Median AQI 401986: Median AQI 381987: Median AQI 411988: Median AQI 421989: Median AQI 351990: Median AQI 411991: Median AQI 361992: Median AQI 341993: Median AQI 401994: Median AQI 361995: Median AQI 371996: Median AQI 381997: Median AQI 381998: Median AQI 441999: Median AQI 452000: Median AQI 482001: Median AQI 442002: Median AQI 432003: Median AQI 382004: Median AQI 392005: Median AQI 412006: Median AQI 432007: Median AQI 442008: Median AQI 412009: Median AQI 392010: Median AQI 412011: Median AQI 492012: Median AQI 492013: Median AQI 392014: Median AQI 412015: Median AQI 372016: Median AQI 452017: Median AQI 442018: Median AQI 392019: Median AQI 432020: Median AQI 372021: Median AQI 392022: Median AQI 432023: Median AQI 442024: Median AQI 442025: Median AQI 431980198519901995200020052010201520202025
  • 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)22862%
Ozone13738%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
20253652481170000436098PM2.5
20243652311340000446198PM2.5
20233652171480000446496PM2.5
20223642501140000435774PM2.5
2021354261930000395987PM2.5
20203663075810003753115PM2.5
20193612341270000435790PM2.5
2018330250800000395690PM2.5
20173442341100000445884PM2.5
201634722411832004561171PM2.5
20152912414910003754105Ozone
2014276192840000415771PM2.5
2013325232930000395778PM2.5
20123321821500000496182PM2.5
201133817716010004971107PM2.5
2010353257960000416297Ozone
2009363278850000395984Ozone
200833422310641004170159Ozone
200736422513270004471119Ozone
200636025010910004370105Ozone
200533221611060004175140Ozone
200436325510251003971154Ozone
20033572639310003865105Ozone
2002362221112218004393190Ozone
2001346220112140004484126Ozone
2000358190148191004887154Ozone
19993592141122850045100185Ozone
1998360220904181044112209Ozone
199736027468171003887154Ozone
19963622866880003867147Ozone
199535327667100003784129Ozone
19943613055051003664169Ozone
199335824991153004090166Ozone
19923212813370003458126Ozone
19913443004220003658126Ozone
199035324981203004193164Ozone
19892942523750003561115Ozone
19883272106935121042115207Ozone
198730921865251004197166Ozone
198626421635130003877147Ozone
198534025365211004084156Ozone
198434625768210004087150Ozone
19833112106227111041105201Ozone
198232723865222003990156Ozone
198128120652230003993147Ozone
198019295493990054129187Ozone

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 South Carolina with a similar median AQI in 2025

All monitored counties in South Carolina

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