EnviroNearby

Berkeley County, South Carolina air quality history

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

93%
Good days in 2025
35
Median daily AQI, 2025
0
Days above 100 in 2025
270
Days with an AQI in 2025 (of 365)

In 2025, EPA reported a daily Air Quality Index (AQI) for Berkeley, South Carolina on 270 days. 252 of those days (93%) were in the Good range, and the median daily AQI was 35. That median is lower than the typical monitored county in South Carolina (median 43 across 13 counties), and lower than the typical monitored U.S. county (40). The main pollutant was ozone on 270 days. Across the years with fuller monitoring, the share of Good days rose: an average of 80% in 1980–1982 versus 93% in 2023–2025.

EPA did not report an AQI for every day of 2025 here (270 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.

Years with fewer than 120 monitored days (2019) 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%1980: Good 253 of 363 days1980: Moderate 77 of 363 days1980: Unhealthy for Sensitive Groups 31 of 363 days1980: Unhealthy 2 of 363 days19801981: Good 282 of 354 days1981: Moderate 67 of 354 days1981: Unhealthy for Sensitive Groups 2 of 354 days1981: Unhealthy 3 of 354 days1982: Good 323 of 357 days1982: Moderate 27 of 357 days1982: Unhealthy for Sensitive Groups 7 of 357 days1983: Good 303 of 360 days1983: Moderate 38 of 360 days1983: Unhealthy for Sensitive Groups 18 of 360 days1983: Unhealthy 1 of 360 days1984: Good 284 of 362 days1984: Moderate 60 of 362 days1984: Unhealthy for Sensitive Groups 17 of 362 days1984: Unhealthy 1 of 362 days1985: Good 289 of 347 days1985: Moderate 46 of 347 days1985: Unhealthy for Sensitive Groups 12 of 347 days19851986: Good 255 of 357 days1986: Moderate 67 of 357 days1986: Unhealthy for Sensitive Groups 28 of 357 days1986: Unhealthy 5 of 357 days1986: Very Unhealthy 2 of 357 days1987: Good 265 of 360 days1987: Moderate 58 of 360 days1987: Unhealthy for Sensitive Groups 32 of 360 days1987: Unhealthy 5 of 360 days1988: Good 275 of 364 days1988: Moderate 56 of 364 days1988: Unhealthy for Sensitive Groups 27 of 364 days1988: Unhealthy 6 of 364 days1989: Good 259 of 345 days1989: Moderate 61 of 345 days1989: Unhealthy for Sensitive Groups 22 of 345 days1989: Unhealthy 3 of 345 days1990: Good 271 of 348 days1990: Moderate 60 of 348 days1990: Unhealthy for Sensitive Groups 16 of 348 days1990: Unhealthy 1 of 348 days19901991: Good 299 of 362 days1991: Moderate 56 of 362 days1991: Unhealthy for Sensitive Groups 6 of 362 days1991: Unhealthy 1 of 362 days1992: Good 310 of 360 days1992: Moderate 40 of 360 days1992: Unhealthy for Sensitive Groups 10 of 360 days1993: Good 270 of 356 days1993: Moderate 64 of 356 days1993: Unhealthy for Sensitive Groups 20 of 356 days1993: Unhealthy 2 of 356 days1994: Good 302 of 364 days1994: Moderate 54 of 364 days1994: Unhealthy for Sensitive Groups 6 of 364 days1994: Unhealthy 2 of 364 days1995: Good 325 of 360 days1995: Moderate 30 of 360 days1995: Unhealthy for Sensitive Groups 5 of 360 days19951996: Good 321 of 365 days1996: Moderate 39 of 365 days1996: Unhealthy for Sensitive Groups 3 of 365 days1996: Unhealthy 2 of 365 days1997: Good 301 of 362 days1997: Moderate 55 of 362 days1997: Unhealthy for Sensitive Groups 6 of 362 days1998: Good 268 of 362 days1998: Moderate 66 of 362 days1998: Unhealthy for Sensitive Groups 25 of 362 days1998: Unhealthy 3 of 362 days1999: Good 270 of 355 days1999: Moderate 61 of 355 days1999: Unhealthy for Sensitive Groups 21 of 355 days1999: Unhealthy 3 of 355 days2000: Good 259 of 344 days2000: Moderate 70 of 344 days2000: Unhealthy for Sensitive Groups 12 of 344 days2000: Unhealthy 3 of 344 days20002001: Good 301 of 363 days2001: Moderate 57 of 363 days2001: Unhealthy for Sensitive Groups 5 of 363 days2002: Good 283 of 363 days2002: Moderate 70 of 363 days2002: Unhealthy for Sensitive Groups 9 of 363 days2002: Unhealthy 1 of 363 days2003: Good 269 of 364 days2003: Moderate 92 of 364 days2003: Unhealthy for Sensitive Groups 3 of 364 days2004: Good 285 of 364 days2004: Moderate 73 of 364 days2004: Unhealthy for Sensitive Groups 6 of 364 days2005: Good 298 of 341 days2005: Moderate 40 of 341 days2005: Unhealthy for Sensitive Groups 3 of 341 days20052006: Good 271 of 310 days2006: Moderate 38 of 310 days2006: Unhealthy for Sensitive Groups 1 of 310 days2007: Good 202 of 221 days2007: Moderate 18 of 221 days2007: Unhealthy for Sensitive Groups 1 of 221 days2008: Good 211 of 242 days2008: Moderate 29 of 242 days2008: Unhealthy for Sensitive Groups 2 of 242 days2009: Good 268 of 274 days2009: Moderate 6 of 274 days2010: Good 300 of 323 days2010: Moderate 22 of 323 days2010: Unhealthy for Sensitive Groups 1 of 323 days20102011: Good 235 of 264 days2011: Moderate 29 of 264 days2012: Good 186 of 205 days2012: Moderate 19 of 205 days2013: Good 230 of 234 days2013: Moderate 4 of 234 days2014: Good 199 of 212 days2014: Moderate 13 of 212 days2015: Good 208 of 211 days2015: Moderate 3 of 211 days20152016: Good 186 of 196 days2016: Moderate 10 of 196 days2017: Good 234 of 248 days2017: Moderate 14 of 248 days2018: Good 143 of 152 days2018: Moderate 9 of 152 days2019: Good 79 of 79 days2020: Good 219 of 220 days2020: Moderate 1 of 220 days20202021: Good 250 of 258 days2021: Moderate 8 of 258 days2022: Good 221 of 234 days2022: Moderate 13 of 234 days2023: Good 260 of 273 days2023: Moderate 11 of 273 days2023: Unhealthy for Sensitive Groups 2 of 273 days2024: Good 255 of 278 days2024: Moderate 23 of 278 days2025: Good 252 of 270 days2025: Moderate 18 of 270 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 1001981: 90th percentile AQI 671982: 90th percentile AQI 491983: 90th percentile AQI 671984: 90th percentile AQI 801985: 90th percentile AQI 711986: 90th percentile AQI 1001987: 90th percentile AQI 1011988: 90th percentile AQI 931989: 90th percentile AQI 841990: 90th percentile AQI 801991: 90th percentile AQI 671992: 90th percentile AQI 611993: 90th percentile AQI 841994: 90th percentile AQI 641995: 90th percentile AQI 501996: 90th percentile AQI 541997: 90th percentile AQI 671998: 90th percentile AQI 931999: 90th percentile AQI 842000: 90th percentile AQI 802001: 90th percentile AQI 642002: 90th percentile AQI 642003: 90th percentile AQI 662004: 90th percentile AQI 622005: 90th percentile AQI 582006: 90th percentile AQI 542007: 90th percentile AQI 502008: 90th percentile AQI 542009: 90th percentile AQI 422010: 90th percentile AQI 492011: 90th percentile AQI 512012: 90th percentile AQI 502013: 90th percentile AQI 462014: 90th percentile AQI 462015: 90th percentile AQI 442016: 90th percentile AQI 472017: 90th percentile AQI 472018: 90th percentile AQI 472019: 90th percentile AQI 402020: 90th percentile AQI 432021: 90th percentile AQI 472022: 90th percentile AQI 492023: 90th percentile AQI 482024: 90th percentile AQI 492025: 90th percentile AQI 481980: Median AQI 401981: Median AQI 351982: Median AQI 301983: Median AQI 371984: Median AQI 371985: Median AQI 361986: Median AQI 401987: Median AQI 401988: Median AQI 401989: Median AQI 381990: Median AQI 411991: Median AQI 351992: Median AQI 331993: Median AQI 391994: Median AQI 361995: Median AQI 321996: Median AQI 351997: Median AQI 361998: Median AQI 391999: Median AQI 362000: Median AQI 382001: Median AQI 362002: Median AQI 362003: Median AQI 382004: Median AQI 352005: Median AQI 342006: Median AQI 362007: Median AQI 362008: Median AQI 362009: Median AQI 302010: Median AQI 352011: Median AQI 372012: Median AQI 352013: Median AQI 322014: Median AQI 342015: Median AQI 332016: Median AQI 342017: Median AQI 332018: Median AQI 332019: Median AQI 312020: Median AQI 312021: Median AQI 342022: Median AQI 362023: Median AQI 362024: Median AQI 372025: Median AQI 351980198519901995200020052010201520202025
  • 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
Ozone270100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2025270252180000354884Ozone
2024278255230000374990Ozone
20232732601120003648105Ozone
2022234221130000364980Ozone
202125825080000344780Ozone
202022021910000314351Ozone
2019797900000314047Ozone
201815214390000334767Ozone
2017248234140000334790Ozone
2016196186100000344774Ozone
201521120830000334461Ozone
2014212199130000344687Ozone
201323423040000324671Ozone
2012205186190000355080Ozone
2011264235290000375190Ozone
20103233002210003549108Ozone
200927426860000304267Ozone
20082422112920003654143Ozone
20072212021810003650105Ozone
20063102713810003654119Ozone
20053412984030003458126Ozone
20043642857360003562133Ozone
20033642699230003866133Ozone
20023632837091003664151Ozone
20013633015750003664112Ozone
200034425970123003880174Ozone
199935527061213003684179Ozone
199836226866253003993159Ozone
19973623015560003667143Ozone
19963653213932003554172Ozone
19953603253050003250136Ozone
19943643025462003664161Ozone
199335627064202003984169Ozone
199236031040100003361136Ozone
19913622995661003567154Ozone
199034827160161004180154Ozone
198934525961223003884179Ozone
198836427556276004093177Ozone
1987360265583250040101179Ozone
1986357255672852040100209Ozone
198534728946120003671136Ozone
198436228460171003780151Ozone
198336030338181003767151Ozone
19823573232770003049129Ozone
19813542826723003567159Ozone
1980363253773120040100159Ozone

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