Following the release of the Air Pollution Prevention and Control Action Plan in 2013 and the Three-Year Action Plan for Winning the Blue Sky Defense Battle in 2018, the third "Air Ten Measures", the Action Plan for Continuous Improvement of Air Quality (hereinafter referred to as the "Action Plan") has recently been issued. The "Action Plan" aims to drive high-quality economic development through continuous improvements in air quality. Based on the current status of air quality improvements and atmospheric transmission characteristics, the "Action Plan" has adjusted the key areas for air pollution control to 82 cities. How do these changes in the key areas for pollution control compare to those in the Three-Year Action Plan for Winning the Blue Sky Defense Battle?