The Ninth Circuit granted in part and denied in part a petition to review EPA's final rule approving California's SIP for meeting the air quality standard for ozone in the San Joaquin Valley. An environmental group argued the SIP's contingency measure was inadequate because it provided only a nomina...

The D.C. Circuit denied a challenge to EPA's 2015 rule updating the standards under which the Agency audits wood-burning heaters' compliance with CAA emissions limits. An industry group argued the rule was invalid because, unlike the 1988 rule, it authorized testing at other labs and neither account...