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9th Circuit upholds California's Vessel Fuel Rules in face of constitutional challenge

Prior posts have noted that California issued Vessel Fuel Rules designed to reduce air pollution created by ships moving along the coast. The Pacific Merchant Shipping Assoc. sued, alleging that it was unconstitutional to apply such rules to shipping more than 3 miles from the California Coast. The District...

NRDC challenge to EPA approval of California CAA SIP fails

California submitted a Clean Air Act State Implementation Plan to the EPA for approval. Pursuant to the "conformity rule" under 40 C.F.R. Section 93.118, the EPA conducted a review to determine whether the SIP's motor vehicle emissions budgets were adequate for transportation conformity...

Smoke from fires can travel thousands of miles impacting weather, climate, and air quality

Prior posts have noted the impact of fires in Southeast Asia on air pollution throughout the region. While it has been known for decades that large wildfires can create or enhance thunderstorm clouds, leading to what are called pyrocumulonimbus clouds ("pyroCbs"), only recently have researchers...