DOI: 10.57761/e5n1-jh61
title: EPA Air Quality

description: Ambient (outdoor) concentrations of pollutants are measured at more than 4000 monitoring stations owned and operated mainly by state environmental agencies. The agencies send hourly or daily measurements of pollutant concentrations to EPA's database called AQS (Air Quality System). AirData retrieves data from AQS.
description: #Documentation  
The dataset contains some missing observation years and they are varied across states (see the image below: red = data are unavailable).

![](<https://redivis.com/fileUploads/d3316011-7fea-4143-b331-34467deb7275>)*(Open the image in a new tab for bigger size)*

The list below details the missing observation years from the corresponding state:

- Alaska: 1987, 1994-2010
- District of Columbia: 1988
- Hawaii: 1980, 1981, 1986
- Idaho: 1991-1993
- Nevada: 1980, 1982-1997, 2009
- Oregon: 1996-2002
- South Dakota: 1980-2000
- Virgin Islands: 1980-1982, 2014-2018
- Wyoming: 1980-1993, 1996-2001

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description: #Section 2  
The dataset contains some missing observation years and they are varied across states (see the image below: red = data are unavailable).

![](<https://redivis.com/fileUploads/9b283f68-6ff7-454c-a026-e61b9091c8e9>)*(Open the image in a new tab for bigger size)*

The list below details the missing observation years from the corresponding state:

- Alaska: 1982, 1986
- Idaho: 1980-1988, 1991
- Montana: 1984-1987
- Puerto Rico: 1980, 1985, 1994-1996, 2003
- South Dakota: 1980-1986, 1993-1998
- Virgin Islands: 1980-1997, 2004-2018
- Wyoming: 1980-1986

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description: #Section 3  
The dataset contains some missing observation years and they are varied across states (see the image below: red = data are unavailable).

![](<https://redivis.com/fileUploads/ff8ed482-a237-419e-aeeb-1f7b0122b975>)*(Open the image in a new tab for bigger size)*

The list below details the missing observation years from the corresponding state:

- Delaware: 1999, 2010-2018
- District of Columbia: 1988, 2000
- Louisiana: 1998
- Mississippi: 2008, 2009
- New York: 2010-2016
- Virgin Islands: 1988-1994, 2012, 2016-2018

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description: #Section 4  
The dataset contains some missing observation years and they are varied across states (see the image below: red = data are unavailable).

![](<https://redivis.com/fileUploads/9962604a-d1a0-4ea3-a043-de0d9b180d64>)*(Open the image in a new tab for bigger size)*

The list below details the missing observation years from the corresponding state:

- Alabama: 1992-2001, 2004
- Alaska: 1989-2009, 2013-2018
- Arizona: 1998-2009
- Arkansas: 1980, 1992-2010, 2017, 2018
- Colorado: 1980, 1981, 2016-2018
- Connecticut: 1989-2009, 2017, 2018
- Delaware: 1990-2002
- District of Columbia: 1980, 1988, 2000, 2002-2011, 2017, 2018
- Georgia: 1989-2001
- Hawaii: 1998-2001, 2011
- Idaho: 2003-2010, 2017, 2018
- Iowa: 1999-2008
- Kansas: 1999-2009
- Kentucky: 1989-2009
- Louisiana: 2003, 2004, 2007-2014
- Maine: 1994-2018
- Maryland: 2004-2011, 2018
- Massachussetts: 1996, 1997, 2018
- Mississippi: 1998-2010, 2017, 2018
- Missouri: 1980, 1981
- Montana: 2002-2018
- Nebraska: 2003-2009
- Nevada: 1988-2010, 2017, 2018
- New Hampshire: 1981-1987, 1989-1991, 2017, 2018
- New Jersey: 2009-2011
- New Mexico: 1999, 2000, 2005-2007, 2010, 2011, 2018
- New York: 2018
- North Carolina: 1989-1995, 1998-2010, 2017, 2018
- North Dakota: 1984-2018
- Ohio: 1995-2008
- Oklahoma: 1998-2004
- Oregon: 1989-1993, 1996-2000, 2005-2009
- Puerto Rico: 1994-1996, 2009
- Rhode Island: 1990-2000, 2003-2010, 2017, 2018
- South Dakota: 1980, 1987-2018
- Utah: 1980, 1981, 2006-2009, 2018
- Vermont: 1991-2011, 2015-2018
- Virgin Islands: 1989-2018
- Virginia: 1999-2003
- Washington: 2000, 2003-2010
- West Virginia: 1998-2004
- Wisconsin: 1998, 1999, 2008, 2009
- Wyoming: 1980, 1986-2018

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description: #Section 5  
The dataset contains some missing observation years and they are varied across states (see the image below: red = data are unavailable).

![](<https://redivis.com/fileUploads/3bad8cfb-acaa-4d9a-8185-f2d5a4be53ad>)*(Open the image in a new tab for bigger size)*

The list below details the missing observation years from the corresponding state:

- Alabama: 1983-1990, 2006-2012
- Alaska: 1982-1988, 1992-2013
- Hawaii: 1980, 1983-1991
- Idaho: 1980-1993, 2018
- Iowa: 1982-1999
- Kansas: 1980, 1984, 1985, 1988, 1990, 1991, 1993, 1994
- Maine: 1983-1989
- Mississippi: 1983-1995
- Nebraska: 1982-2018
- New Hampshire: 1980-1985
- North Carolina: 1980, 1981, 1983
- Puerto Rico: 1980-1996, 2008-2011, 2013
- South Dakota: 1980-2000
- Utah: 1991
- Vermont: 1980-1984
- Virgin Islands: 1980-2018 (All)
- Washington: 1988-1994
- West Virginia: 2000-2002, 2006-2018
- Wyoming: 1980-2000

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description: #Section 6  
The dataset contains some missing observation years and they are varied across states (see the image below: red = data are unavailable).

![](<https://redivis.com/fileUploads/fc108212-35f3-4188-9202-b7924e882ca7>)*(Open the image in a new tab for bigger size)*

The list below details the missing observation years from the corresponding state:

- Arkansas: 1980, 1981, 1984-1990
- District of Columbia: 1988
- Louisiana: 1980
- Maine: 1992-2000
- Mississippi: 2006-2009
- North Dakota: 1980-1989, 1995-2007
- Puerto Rico: 1980
- South Dakota: 1980-2008
- Virgin Island: 1980-2018 (All)
- Wyoming: 1980-2000

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description: #Section 7  
No missing observation year was present. This dataset starts from 1999.

![](<https://redivis.com/fileUploads/5d3d2612-b3d2-4cf5-85eb-7170f0b1a804>)*(Open the image in a new tab for bigger size)*


description: #Section 8  
EPA sets [national air quality standards](<https://www.epa.gov/learn-issues/learn-about-air>) for six common pollutants, also called [criteria pollutants](<https://www.epa.gov/criteria-air-pollutants>), to protect public health. Monitoring sites report data to EPA for these six criteria air pollutants:



- Ozone (O3)
- Particulate matter (PM10 and PM2.5)
- Carbon monoxide (CO)
- Nitrogen dioxide (NO2)
- Sulfur dioxide (SO2)
- Lead (Pb)

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(PM10 includes particles less than or equal to 10 micrometers in diameter. PM2.5 includes particles less than or equal to 2.5 micrometers and is also called fine particle pollution.)


description: #Section 9  
Please use the following citation: *US Environmental Protection Agency. Air Quality System Data Mart [internet database] available via https://www.epa.gov/airdata. Accessed Month DD, YYYY.*



**Contact authors**

Please follow [this link](<https://www.epa.gov/outdoor-air-quality-data/forms/contact-us-about-outdoor-air-quality-data>) to contact the authors.