Located in the Hercules Glades Wilderness near Branson, this air monitoring station provides data to help federal and state agencies assess regional haze. It's part of a program called Interagency Monitoring of Protected Visual Environments (IMPROVE), charged with improving visibility in national parks larger than 6,000 acres and national wilderness areas larger than 5,000 acres. 

Of the approximately 155 national parks and wilderness areas in the program, two are in Missouri: Mingo National Wildlife Refuge and Hercules Glades. El Dorado Springs in eastern Missouri is a former IMPROVE protocol site. It provided data on regional haze and visibility in an area where no Class I park or national park existed. In 2016, EPA ceased funding it and eight other protocol sites.


Fine Particulate Matter (PM 2.5)

Departmental information about particulate matter (PM)

  • Description of two groups of particulate matter: PM2.5 and PM10
  • 1997, 2006 and 2012 standards for PM2.5 plus related documents
  • 2006 PM10 standard and pertinent documents
  • Annual PM2.5 design values
  • 24-Hour PM2.5 design values
  • Map of PM2.5 sites

This site does not include a continuous monitor or NAAQS compliance monitoring. Visit the following website to access data for this air monitoring site.

Hercules Glades Air Monitoring Site

Hwy 160
Forsyth, MO 65744
United States

Date Established
Pollutants Monitored
Particulate Matter
36.613879, -92.92228