The NYT is reporting that proposed ozone standards may pose a problem for oil and gas producers in Colorado, Wyoming, New Mexico and Utah. "While the effects of a tougher health standard would be most immediately felt in smog-choked urban areas, where motor vehicles contribute billions of tons of ozone-forming pollutants annually, the odorless gas is a growing problem in many more rural states, especially where oil and gas producers have sunk thousands of wells into the ground, resulting in releases of ozone-forming pollutants."
Air issues are becoming more prevalent.