New York Times: Current air pollution standards for sulfur dioxide (SO2) and nitrogen oxides (NOx) aren’t strict enough to prevent damage to the environment, according to a new policy assessment from U.S. EPA that suggests tougher rules could be on the way. EPA is undergoing a review of the secondary National Ambient Air Quality Standards (NAAQS) for both SO2 and NOx. The welfare-based rules, distinct from the health-based limits on emissions that cause health problems such as asthma, are intended to …