Data / Median Air Quality Index (US EPA) / Forsyth County

Median Air Quality Index (US EPA) in Forsyth County

Median Air Quality Index (US EPA) in Forsyth County was 45 in 2025, according to the U.S. Environmental Protection Agency. That is down 2 from 2024.

2025, index45
Change on 2024-2
Series high631999
Series low271980

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Median Air Quality Index (US EPA) in Forsyth County, 1980 to 2025

20304050607019801987199420012008201520251980: 27 index1981: 33 index1982: 30 index1983: 30 index1984: 38 index1985: 41 index1986: 44 index1987: 48 index1988: 48 index1989: 47 index1990: 49 index1991: 46 index1992: 44 index1993: 47 index1994: 45 index1995: 43 index1996: 44 index1997: 45 index1998: 43 index1999: 63 index2000: 63 index2001: 62 index2002: 61 index2003: 59 index2004: 61 index2005: 58 index2006: 61 index2007: 61 index2008: 58 index2009: 55 index2010: 58 index2011: 54 index2012: 52 index2013: 51 index2014: 52 index2015: 49 index2016: 47 index2017: 47 index2018: 50 index2019: 51 index2020: 45 index2021: 48 index2022: 48 index2023: 52 index2024: 47 index2025: 45 index20304050607019801996201220251980: 27 index1981: 33 index1982: 30 index1983: 30 index1984: 38 index1985: 41 index1986: 44 index1987: 48 index1988: 48 index1989: 47 index1990: 49 index1991: 46 index1992: 44 index1993: 47 index1994: 45 index1995: 43 index1996: 44 index1997: 45 index1998: 43 index1999: 63 index2000: 63 index2001: 62 index2002: 61 index2003: 59 index2004: 61 index2005: 58 index2006: 61 index2007: 61 index2008: 58 index2009: 55 index2010: 58 index2011: 54 index2012: 52 index2013: 51 index2014: 52 index2015: 49 index2016: 47 index2017: 47 index2018: 50 index2019: 51 index2020: 45 index2021: 48 index2022: 48 index2023: 52 index2024: 47 index2025: 45 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 46 values
Periodindex
202545
202447
202352
202248
202148
202045
201951
201850
201747
201647
201549
201452
201351
201252
201154
201058
200955
200858
200761
200661
200558
200461
200359
200261
200162
200063
199963
199843
199745
199644
199543
199445
199347
199244
199146
199049
198947
198848
198748
198644
198541
198438
198330
198230
198133
198027

Forsyth County compared with nearby places

Alexander County: 38 indexAvery County: 38 indexBuncombe County: 40 indexCaldwell County: 36 indexCarteret County: 35 indexCaswell County: 37 indexCatawba County: 42 indexCumberland County: 44 indexDavidson County: 51 indexDurham County: 42 indexEdgecombe County: 38 indexForsyth County: 45 indexGraham County: 41 indexGranville County: 39 indexGuilford County: 41 indexHaywood County: 43 indexHyde County: 24 indexJohnston County: 41 indexLenoir County: 35 indexLincoln County: 41 indexMacon County: 32 indexMartin County: 31 indexMecklenburg County: 51 indexMitchell County: 31 indexMontgomery County: 39 indexNew Hanover County: 41 indexNorthampton County: 33 indexPerson County: 36 indexPitt County: 37 indexRockingham County: 38 indexRowan County: 43 indexSwain County: 37 indexUnion County: 40 indexWake County: 43 index
  • Under 35
  • 35 to 37
  • 37 to 39
  • 39 to 41
  • 41 to 43
  • 43 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Forsyth County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries.

More on how it is measured
  • The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide).
  • Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.

United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.

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How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Environmental Protection Agency. (2026). EPA AirData annual AQI by county: median daily AQI (Median Air Quality Index (US EPA), Forsyth County, 1980 to 2025) [Data set]. Retrieved October 12, 2026, from https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual

MLA 9

EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Forsyth County, 1980 to 2025. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/median-air-quality-index/forsyth-county-north-carolina. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Median Air Quality Index (US EPA), Forsyth County, 1980 to 2025. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/median-air-quality-index/forsyth-county-north-carolina.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Forsyth County, 1980 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/forsyth-county-north-carolina (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Forsyth County, 1980 to 2025}},
  year = {2026},
  howpublished = {Data set},
  url = {https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/forsyth-county-north-carolina. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download\_files.html\#Annual. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Environmental Protection Agency
TI  - EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Forsyth County, 1980 to 2025
PY  - 2026
DA  - 2026/07/13
PB  - U.S. Environmental Protection Agency
DB  - Invokely
UR  - https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual
L2  - https://invokely.ai/en/median-air-quality-index/forsyth-county-north-carolina
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/forsyth-county-north-carolina.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the median Air Quality Index (US EPA) in Forsyth County?

Median Air Quality Index (US EPA) in Forsyth County was 45 in 2025, according to the U.S. Environmental Protection Agency. That is down 2 from 2024.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: median daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest median Air Quality Index (US EPA) in Forsyth County?

63 in 1999, the highest value since 1980 in this series.

Related statistics for Forsyth County

All statistics for Forsyth County | Forsyth County in figures