This report addresses the impact on a regional scale of particulate emissions from the Energy Fuels Resources Corporation (Energy Fuels) proposed Piñon Ridge Mill located in Montrose County, Colorado. The regional dust analysis was completed in response to questions posed by the Colorado Department of Public Health and Environment (CDPHE) regarding the possible contribution from the operations of the proposed Piñon Ridge Mill to particulate matter...

Big Bend National Park is located in southwestern Texas along the Mexican-Texas border. During the 1990s, the haze at Big Bend and other sites in West Texas and southern New Mexico increased, further obscuring Big Bend's and regions scenic beauty. In response to the increased haze, the Big Bend Regional Aerosol and Visibility Observational (BRAVO) study was conducted. This was an intensive monitoring study sampling aerosol physical, chemical and optical...