CRITICS CHARGE CNG SPEC RELAXATION POSES POLLUTION, ENGINE PROBLEMS

Southern California air officials and national engine makers are warning that an air board proposal to relax its compressed natural gas (CNG) motor vehicle specifications to accommodate hotter burning liquefied natural gas (LNG) supplies is likely to hike pollution from older heavy-duty vehicles and damage other CNG models. But the rule changes are considered crucial for gas suppliers and utilities, which otherwise would face daunting economic impacts if forced to "clean up" vast quantities of future natural gas supplies before...