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Four Corners Air Quality Group

Welcome to the Four Corners Air Quality Group home page!

The Four Corners Air Quality Group is a forum for individuals interested in air quality to meet, learn about current conditions, review progress on mitigation of air quality impacts, and generally contribute to clean air in the Four Corners area.

The Group meets at least once per year and more often if circumstances warrant it. The Group is convened by the States of Colorado and New Mexico, with the support of a range of state, tribal and federal agencies.

To join the Four Corners Air Quality Group, please sign up. You will be notified of meetings and other important air quality information affecting the Four Corners area.


As a member of the Four Corners Air Quality Group, you may also be interested in receiving email alerts regarding the Clean Power Plan and the status of New Mexico's State Plan development. You may sign up for these notices using the "subscribe to email alerts" link.  For more information on the Clean Power Plan, New Mexico's State Plan development and ways to comment to NMED, please visit

For Colorado residents, go to to get more information about Colorado's Clean Power Plan, sign up for CDPHE's mailing list, or submit a comment online. 

A meeting Four Corners Air Quality Group was held November 9-10, 2015 at Ft. Lewis College in Durango, CO. 


A public science forum to discuss the methane issue in the San Juan Basin was held on April 17, 2015 from 9 am to noon at San Juan College in Farmington, New Mexico. The purpose of the forum was to provide the public with information about scientific research already conducted in the basin and on-going research measurements. What has been learned and what are on-going studies investigating?


On November 25, 2014, the EPA proposed to strengthen the National Ambient Air Quality Standards (NAAQS) for ground-level ozone. More information can be found on EPA’s regulatory actions website here: .

2014 Four Corners Air Quality Agency Updates and Four Corners Studies are available here:

September 9, 10, 2013 meeting materials

May 30, 2012 meeting materials

  • April 17, 2012 - EPA issued cost-effective regulations, required by the Clean Air Act, to reduce harmful air pollution from the oil and natural gas industry while allowing continued, responsible growth in U.S. oil and natural gas production.  More information including fact sheets is available here:

  • December 21, 2011 - EPA announces Mercury and Air Toxics Standards (MATS) for power plants - The U.S. Environmental Protection Agency (EPA) announced standards to limit mercury, acid gases and other toxic pollution from power plants.

  • NMED and EPA Field campaign to measure and speciate VOCs at Navajo Lake, Substation and Bloomfield in 2004/2005 and 2009 fourcornersvoc
  • "Passive Monitoring of Ambient Reactive Gaseous Mercury in the Four Corners Area and Eastern Oklahoma" This presentation (available here: summarizes the first year of a two year air monitoring project estimating reactive gaseous mercury (RGM, a.k.a. gaseous oxidized mercury, GOM) dry deposition rates in the Four Corners area and eastern Oklahoma. The project collaborators include the U.S. Environmental Protection Agency (EPA) Region 6, EPA Office of Research and Development (ORD), Frontier Global Sciences, Alion, the New Mexico Environment Department (NMED), the National Park Service (NPS), the Bureau of Land Management (BLM), the Jemez Pueblo, and the Cherokee Nation.



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