Despite significant improvements over the last decade, air pollution in New York City is still a significant environmental threat. Improving our city’s air quality is a difficult task because there are many types of air pollutants that can come from millions of sources, inside and outside city boundaries. OneNYC is the City’s unified strategy to bolster economic development, improve the environment, fight inequality and better the quality of life for all New Yorkers. The plan sets the ambitious goal to “achieve the cleanest air quality of any big U.S. city” by the year 2030. Along with air quality initiatives by other City agencies, the Department of Environmental Protection (DEP) is responsible for updating and enforcing the Air Pollution Control Code (Air Code) which has the goal to preserve, protect and improve the air resources of the city.