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

Median Air Quality Index (US EPA) in Maui County

Median Air Quality Index (US EPA) in Maui County was 21 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024.

2025, index21
Change on 20240
Series high372013
Series low151996

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 Maui County, 1987 to 2025

15202530354019871993199920052011201720251987: 27 index1988: 23 index1989: 22 index1990: 18 index1991: 19 index1992: 23 index1993: 28 index1994: 28 index1995: 28 index1996: 15 index1997: 21 index1998: 25 index1999: 20 index2000: 23 index2001: 21 index2002: 20 index2003: 21 index2004: 18 index2005: 21 index2006: 20 index2007: 22 index2008: 19 index2009: 17 index2010: 24 index2011: 29 index2012: 33 index2013: 37 index2014: 29 index2015: 33 index2016: 28 index2017: 28 index2018: 25 index2019: 20 index2020: 21 index2021: 21 index2022: 21 index2023: 20 index2024: 21 index2025: 21 index1020304019872000201320251987: 27 index1988: 23 index1989: 22 index1990: 18 index1991: 19 index1992: 23 index1993: 28 index1994: 28 index1995: 28 index1996: 15 index1997: 21 index1998: 25 index1999: 20 index2000: 23 index2001: 21 index2002: 20 index2003: 21 index2004: 18 index2005: 21 index2006: 20 index2007: 22 index2008: 19 index2009: 17 index2010: 24 index2011: 29 index2012: 33 index2013: 37 index2014: 29 index2015: 33 index2016: 28 index2017: 28 index2018: 25 index2019: 20 index2020: 21 index2021: 21 index2022: 21 index2023: 20 index2024: 21 index2025: 21 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 39 values
Periodindex
202521
202421
202320
202221
202121
202021
201920
201825
201728
201628
201533
201429
201337
201233
201129
201024
200917
200819
200722
200620
200521
200418
200321
200220
200121
200023
199920
199825
199721
199615
199528
199428
199328
199223
199119
199018
198922
198823
198727

Maui County compared with nearby places

Hawaii County: 32 indexHonolulu County: 29 indexMaui County: 21 index
  • Under 26
  • 26 to 30
  • 30 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Maui 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.

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), Maui County, 1987 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), Maui County, 1987 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/maui-county-hawaii. 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), Maui County, 1987 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/maui-county-hawaii.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Maui County, 1987 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/maui-county-hawaii (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), Maui County, 1987 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/maui-county-hawaii. 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), Maui County, 1987 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/maui-county-hawaii
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/maui-county-hawaii.
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 Maui County?

Median Air Quality Index (US EPA) in Maui County was 21 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged 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 Maui County?

37 in 2013, the highest value since 1987 in this series.

Related statistics for Maui County

All statistics for Maui County | Maui County in figures