The Environmental Protection Agency on Thursday announced a lower allowable standard for ground-level ozone, raising the possibility for western Rio Blanco County to be considered out of attainment with the limits for smog. However, the EPA's decision to reduce the standard from 75 parts per billion to 70 parts per billion, and not drop it further as it had been considering, means other areas including Mesa County would likely be spared a nonattainment designation.
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