WESTERN AIR OFFICIALS EYE MAJOR PUSH TO OVERHAUL PARK AIR RULES

Western state air officials are planning a major effort aimed at convincing EPA to accept a new approach to setting emissions limits in national parks and other pristine areas that shifts away from air quality thresholds and instead relies on ecological impacts. Supporters of what is known as the "critical load" approach say it is the most effective method for protecting human health and habitats because it limits emissions based on the damage caused to local ecosystems. It would set...