国际清洁空气蓝天日，UNEP相关负责人点赞中国大气治理成效

Group 1 - The core message emphasizes China's significant progress in air quality improvement, showcasing it as a global model for ecological civilization and air governance [1][2] - As of 2023, the number of cities in China meeting air quality standards has reached 203, accounting for approximately 60% of the 339 monitored cities [1] - China's rapid improvement in air quality positions it as the fastest country globally in this regard, attributed to strict standards, enhanced monitoring systems, and a transition to clean energy [1] Group 2 - The United Nations Environment Programme is assisting global southern countries, particularly in Africa, to improve air quality through data sharing and regional cooperation [2] - The Chinese ecological civilization concept aligns with contemporary development themes, promoting a clean environment without sacrificing economic growth, thus fostering new green industries [2]