Data / Highest daily Air Quality Index (US EPA) / St. Lawrence County

Highest daily Air Quality Index (US EPA) in St. Lawrence County

Highest daily Air Quality Index (US EPA) in St. Lawrence County was 85 in 2009, according to the U.S. Environmental Protection Agency. That is up 19 from 2008.

2009, index85
Change on 2008+19
Series high1532002
Series low662008

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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Highest daily Air Quality Index (US EPA) in St. Lawrence County, 1999 to 2009

60801001201401601999200120032005200720091999: 74 index2000: 77 index2001: 105 index2002: 153 index2003: 131 index2004: 101 index2005: 99 index2006: 87 index2007: 83 index2008: 66 index2009: 85 index50751001251501751999200320091999: 74 index2000: 77 index2001: 105 index2002: 153 index2003: 131 index2004: 101 index2005: 99 index2006: 87 index2007: 83 index2008: 66 index2009: 85 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 11 values
Periodindex
200985
200866
200783
200687
200599
2004101
2003131
2002153
2001105
200077
199974

St. Lawrence County compared with nearby places

Albany County: 115 indexBronx County: 147 indexChautauqua County: 133 indexChemung County: 97 indexDutchess County: 122 indexErie County: 126 indexEssex County: 136 indexFranklin County: 147 indexHamilton County: 105 indexHerkimer County: 105 indexJefferson County: 154 indexKings County: 105 indexMadison County: 97 indexMonroe County: 165 indexNassau County: 108 indexNew York County: 126 indexNiagara County: 129 indexOneida County: 88 indexOnondaga County: 119 indexOrange County: 108 indexOswego County: 108 indexPutnam County: 129 indexQueens County: 112 indexRensselaer County: 122 indexRichmond County: 150 indexRockland County: 100 indexSt. Lawrence County: 85 indexSaratoga County: 122 indexSchenectady County: 112 indexSteuben County: 101 indexSuffolk County: 151 indexTompkins County: 93 indexUlster County: 108 indexWayne County: 97 indexWestchester County: 119 index
  • Under 99
  • 99 to 110
  • 110 to 120
  • 120 to 140
  • 140 and over
  • No data
Highest daily Air Quality Index (US EPA), 2009, index. St. Lawrence 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

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. 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: highest 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: highest daily AQI (Highest daily Air Quality Index (US EPA), St. Lawrence County, 1999 to 2009) [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: highest daily AQI, Highest daily Air Quality Index (US EPA), St. Lawrence County, 1999 to 2009. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/highest-daily-air-quality-index/st-lawrence-county-new-york. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: highest daily AQI. Highest daily Air Quality Index (US EPA), St. Lawrence County, 1999 to 2009. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/highest-daily-air-quality-index/st-lawrence-county-new-york.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), St. Lawrence County, 1999 to 2009 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/st-lawrence-county-new-york (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2009,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), St. Lawrence County, 1999 to 2009}},
  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/highest-daily-air-quality-index/st-lawrence-county-new-york. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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: highest daily AQI: Highest daily Air Quality Index (US EPA), St. Lawrence County, 1999 to 2009
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/highest-daily-air-quality-index/st-lawrence-county-new-york
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/st-lawrence-county-new-york.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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 highest daily Air Quality Index (US EPA) in St. Lawrence County?

Highest daily Air Quality Index (US EPA) in St. Lawrence County was 85 in 2009, according to the U.S. Environmental Protection Agency. That is up 19 from 2008.

Where does this figure come from?

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

What was the highest highest daily Air Quality Index (US EPA) in St. Lawrence County?

153 in 2002, the highest value since 1999 in this series.

Related statistics for St. Lawrence County

All statistics for St. Lawrence County | St. Lawrence County in figures