Carbon monoxide is a colorless, odorless gas emitted from combustion processes. Nationally, and particularly in urban areas, the majority of CO emissions to ambient air come from mobile sources. CO can cause harmful health effects by reducing oxygen delivery to the body's organs and tissues. At extremely high levels, CO can cause death. The federal government has established two primary standards for carbon monoxide designed to protect public health. Oklahoma is in attainment with both federal standards.

Pollutant Primary/
Level Form
Carbon Monoxide Primary 8-hour 9 ppm Not to be exceeded more than once per year
1-hour 35 ppm

CO Monitoring Sites

The entire CO network consists of two monitors--one in Oklahoma City and one in Tulsa. All carbon monoxide monitors sample air continuously. All samplers use the approved gas filter correlation method and report hourly values which are used to determine compliance with the standard. Data collected at the state's carbon monoxide sites may be accessed here.

2013 CO Data

CO data indicates that Oklahoma has exceedingly good air quality with ambient values well below the national standards. Improved fuel burning efficiency of mobile sources will continue to be the major impetus in attainment of these standards.

2013 8-hour CO Values2013 1-hour CO Values