EnviroNearby

Georgetown County, South Carolina air quality history

Daily Air Quality Index summaries from EPA monitors in Georgetown, South Carolina, 1982–2019.

100%
Good days in 2018
15
Median daily AQI, 2018
0
Days above 100 in 2018
326
Days with an AQI in 2018 (of 365)

In 2018, EPA reported a daily Air Quality Index (AQI) for Georgetown, South Carolina on 326 days. 326 of those days (100%) were in the Good range, and the median daily AQI was 15. That median is lower than the typical monitored county in South Carolina (median 39 across 17 counties), and lower than the typical monitored U.S. county (41). The main pollutant was coarse particles (PM10) on 326 days. Across the years with fuller monitoring, the share of Good days rose: an average of 88% in 1991–1993 versus 100% in 2016–2018.

The most recent year with data for this county is 2019; EPA's files for 2020–2025 contain no row for it, which usually means its monitors stopped reporting.

Years with fewer than 120 monitored days (1986, 1987, 1988, 1989, 1990, 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%1982: Good 18 of 18 days19821983: Good 41 of 46 days1983: Moderate 5 of 46 days1984: Good 41 of 53 days1984: Moderate 12 of 53 days1985: Good 40 of 46 days1985: Moderate 6 of 46 days1986: Good 45 of 47 days1986: Moderate 2 of 47 days1987: Good 51 of 54 days1987: Moderate 3 of 54 days19871988: Good 53 of 59 days1988: Moderate 6 of 59 days1989: Good 43 of 47 days1989: Moderate 4 of 47 days1990: Good 54 of 57 days1990: Moderate 3 of 57 days1991: Good 129 of 157 days1991: Moderate 28 of 157 days1992: Good 293 of 328 days1992: Moderate 35 of 328 days19921993: Good 301 of 321 days1993: Moderate 20 of 321 days1994: Good 322 of 363 days1994: Moderate 41 of 363 days1995: Good 312 of 341 days1995: Moderate 29 of 341 days1996: Good 329 of 360 days1996: Moderate 29 of 360 days1996: Unhealthy for Sensitive Groups 2 of 360 days1997: Good 311 of 364 days1997: Moderate 53 of 364 days19971998: Good 290 of 318 days1998: Moderate 28 of 318 days1999: Good 244 of 339 days1999: Moderate 92 of 339 days1999: Unhealthy for Sensitive Groups 3 of 339 days2000: Good 258 of 365 days2000: Moderate 105 of 365 days2000: Unhealthy for Sensitive Groups 2 of 365 days2001: Good 255 of 341 days2001: Moderate 86 of 341 days2002: Good 197 of 281 days2002: Moderate 84 of 281 days20022003: Good 194 of 298 days2003: Moderate 104 of 298 days2004: Good 228 of 347 days2004: Moderate 117 of 347 days2004: Unhealthy for Sensitive Groups 2 of 347 days2005: Good 210 of 329 days2005: Moderate 116 of 329 days2005: Unhealthy for Sensitive Groups 3 of 329 days2006: Good 266 of 346 days2006: Moderate 80 of 346 days2007: Good 317 of 351 days2007: Moderate 34 of 351 days20072008: Good 351 of 365 days2008: Moderate 14 of 365 days2009: Good 351 of 365 days2009: Moderate 14 of 365 days2010: Good 340 of 364 days2010: Moderate 24 of 364 days2011: Good 348 of 365 days2011: Moderate 17 of 365 days2012: Good 343 of 343 days20122013: Good 354 of 356 days2013: Moderate 2 of 356 days2014: Good 341 of 343 days2014: Moderate 2 of 343 days2015: Good 272 of 274 days2015: Moderate 2 of 274 days2016: Good 309 of 312 days2016: Moderate 3 of 312 days2017: Good 303 of 304 days2017: Moderate 1 of 304 days20172018: Good 326 of 326 days2019: Good 91 of 92 days2019: Moderate 1 of 92 days2019
  • 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 year0501001982: 90th percentile AQI 411983: 90th percentile AQI 531984: 90th percentile AQI 561985: 90th percentile AQI 531986: 90th percentile AQI 431987: 90th percentile AQI 451988: 90th percentile AQI 521989: 90th percentile AQI 501990: 90th percentile AQI 491991: 90th percentile AQI 561992: 90th percentile AQI 511993: 90th percentile AQI 451994: 90th percentile AQI 511995: 90th percentile AQI 481996: 90th percentile AQI 501997: 90th percentile AQI 531998: 90th percentile AQI 481999: 90th percentile AQI 662000: 90th percentile AQI 682001: 90th percentile AQI 632002: 90th percentile AQI 652003: 90th percentile AQI 632004: 90th percentile AQI 672005: 90th percentile AQI 692006: 90th percentile AQI 622007: 90th percentile AQI 492008: 90th percentile AQI 422009: 90th percentile AQI 412010: 90th percentile AQI 462011: 90th percentile AQI 382012: 90th percentile AQI 312013: 90th percentile AQI 252014: 90th percentile AQI 302015: 90th percentile AQI 312016: 90th percentile AQI 282017: 90th percentile AQI 302018: 90th percentile AQI 272019: 90th percentile AQI 251982: Median AQI 251983: Median AQI 311984: Median AQI 321985: Median AQI 351986: Median AQI 301987: Median AQI 301988: Median AQI 281989: Median AQI 291990: Median AQI 311991: Median AQI 361992: Median AQI 301993: Median AQI 301994: Median AQI 291995: Median AQI 291996: Median AQI 311997: Median AQI 321998: Median AQI 301999: Median AQI 332000: Median AQI 342001: Median AQI 312002: Median AQI 312003: Median AQI 382004: Median AQI 392005: Median AQI 392006: Median AQI 312007: Median AQI 262008: Median AQI 252009: Median AQI 232010: Median AQI 222011: Median AQI 202012: Median AQI 172013: Median AQI 152014: Median AQI 172015: Median AQI 152016: Median AQI 162017: Median AQI 152018: Median AQI 152019: Median AQI 14198219871992199720022007201220172019
  • Median daily AQI
  • 90th-percentile daily AQI

Main pollutant by day, 2018

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
Coarse particles (PM10)326100%

Year-by-year data

Annual AQI summary by year
YearDays with AQIGoodModerateUnhealthy for Sensitive GroupsUnhealthyVery UnhealthyHazardousMedian AQI90th pct.Max AQIMain pollutant
2019929110000142552PM10
201832632600000152744PM10
201730430310000153063PM10
201631230930000162862PM10
201527427220000153155PM10
201434334120000173053PM10
201335635420000152553PM10
201234334300000173147PM10
2011365348170000203879PM10
2010364340240000224685PM10
2009365351140000234163PM10
2008365351140000254266PM10
2007351317340000264997PM10
2006346266800000316299PM10
200532921011630003969117PM10
200434722811720003967110PM10
20032981941040000386388PM10
2002281197840000316587PM10
2001341255860000316384PM10
200036525810520003468104PM10
19993392449230003366120PM10
1998318290280000304860PM10
1997364311530000325375PM10
19963603292920003150119PM10
1995341312290000294866PM10
1994363322410000295183PM10
1993321301200000304599PM10
1992328293350000305192PM10
1991157129280000365679PM10
1990575430000314957PM10
1989474340000295057PM10
1988595360000285259PM10
1987545130000304569PM10
1986474520000304354PM10
1985464060000355364PM10
19845341120000325663PM10
1983464150000315375PM10
1982181800000254144PM10

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 2018

All monitored counties in South Carolina

Source: U.S. EPA AirData, “Annual AQI by County” files for 1982–2019 (EPA download page). EPA file dates: 2026-06-26. Imported into EnviroNearby November 5, 2026. How we use this data · Report a problem