This is the Ozone Transport Commission’s model rule for additional nitrogen oxides (NOx) control measures. This model rule was developed by the Ozone Transport Commission (OTC) as part of a regional effort to attain and maintain the one-hour ozone standard, address emission reduction shortfalls that were identified by the U.S. Environmental Protection Agency in specific State’s plans to attain the one-hour ozone standard, and reduce eight-hour ozone levels.