CARB Downplays Haze Plan’s SO2 Emissions Flagged By U.S. Park Service

California air board officials are downplaying the significance of sulfur dioxide (SO2) emissions in their newly adopted haze state implementation plan (SIP) to be submitted to EPA, despite National Park Service (NPS) recommendations to bolster the plan’s attention to SO2 and consider rules to lower such emissions from industrial sources. “The proposed SIP focuses exclusively on [nitrogen oxide (NOx)] but does not address SO2 contributions to ammonium sulfate, a larger component of haze than ammonium nitrate in most of the...