Uintah Basin Ozone
The National Park Service has been measuring ozone using a portable ozone analyzer beginning in 2005 at Dinosaur National Monument, located near Vernal Utah, and beginning in 2006 at Colorado National Monument, located near Grand Junction, CO. The Environmental Protection Agency began measuring ozone at two sites on the Ute Indian Reservation, located near the towns of Redwash and Ouray, in 2009.
All of these monitors are currently showing attainment of the 2008 ozone NAAQS. However, preliminary data collected from the two tribal sites during the winter of 2010 indicate that high ozone levels may be occurring in the Basin during the middle of winter. Further information will be provided when 2010 data are available from EPA.
