The season for high levels of ozone pollution has arrived in the Upper Green River Basin in western Wyoming, but so far ozone levels have been relatively low. Last winter, ozone levels in the Pinedale area soared above levels normally seen in big cities during the summertime. The ozone results from air pollution caused by activity in 2 of the nation's biggest gas fields, the Jonah Field and Pinedale Anticline. Certain weather conditions must also be in place for ground-level ozone to form. They include bright, sunny weather and snow on the ground to reflect that sunlight back into the atmosphere. So far there isn't much snow cover in the Pinedale area. State regulators and gas industry representatives say they're ready to act if ozone levels rise.
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