ELR Citation: 44 ELR 20084
No(s). 11-1423 (D.C. Cir. Apr 11, 2014)

 The primary standards for carbon monoxide have remained the same since 1971. There has not been a secondary standard for carbon monoxide since EPA revoked a secondary standard in 1985. In 2007, EPA began reviewing whether to alter the current primary standards and whether to adopt a secondary ...