EPA is required by Section 109(d) the Clean Air Act to review the adequacy of each National Ambient Air Quality Standard (“NAAQS”) every five years to determine if new scientific evidence justifies a change to the standard.  The current primary[i] NAAQS for nitrogen dioxide (“NO2”) is 53 ppb annual mean and 100 ppb NO2 as

aerial of baton Rouge with Missisippi river and oil refineries at the horizon

The May 4, 2016, Federal Register contains a notice of the Environmental Protection Agency’s (“EPA’s”) final decision that the Baton Rouge ozone nonattainment area has attained the 2008 8-hour ozone National Ambient Air Quality Standard (“NAAQS”). 81 Fed. Reg. 26,697. (The Baton Rouge nonattainment area consists of the parishes of Ascension, East Baton Rouge, Iberville,