A district court dismissed environmental groups' CAA citizen suit against EPA for failing to respond to their 2011 petition concerning ammonia gas pollution. In 2011, the groups petitioned EPA asking it to find that ammonia gas pollution endangers the public health and welfare, designate ammonia as ...

The D.C. Circuit dismissed a truck association's lawsuit against EPA challenging California's tractor-trailer emission rules. The association argued that the state regulations impermissibly discriminate against out-of-state tractor trailers in violation of the dormant Commerce Clause. The associatio...

The Federal Claims Court held that the U.S. government may not engage in discovery about oil companies' insurance policies in an underlying case concerning cleanup costs stemming from the production of high-octane aviation gas (avgas) during World War II. The Federal Circuit previously held that the...