Arizona Part 1A is a set of regulations issued by the Arizona Department of Environmental Quality (ADEN) to protect the state’s air quality. The regulations are designed to reduce emissions from stationary sources, like factories and power plants, and mobile sources, like automobiles and airplanes. There are several types of Arizona Part 1A regulations, including the Arizona State Implementation Plan (SIP), the New Source Performance Standards (NPS), the National Ambient Air Quality Standards (NAANS), and the Arizona Air Quality Control Rules (AAQ CR). These regulations are designed to ensure that the air quality in the state is safe and healthy for the residents of Arizona.