Beijing Declares Major Victory in 'Blue Sky Defense War' as PM2.5 Levels Fall Below 30 Micrograms Per Cubic Meter in 2025

Historic Achievement in Air Quality Improvement

Beijing has declared a major victory in its long-standing 'blue sky defense war,' with the city's Ecology and Environment Bureau announcing a significant reduction in heavy air pollution days and a landmark achievement in PM2.5 concentration for 2025. The annual average PM2.5 concentration in the Chinese capital reached 27.0 micrograms per cubic meter, marking the first time it has fallen below the 30-microgram benchmark since monitoring began.

The announcement, made on Sunday, highlighted a dramatic decrease in heavily polluted days, with only one such day recorded in 2025. This represents a staggering reduction from the 58 heavily polluted days experienced in 2013. Furthermore, the city enjoyed 348 days of good air quality throughout 2025, an increase of 144 days compared to 2013.

Decade-Long Battle Against Smog

Historically, Beijing grappled with severe and frequent smog, with its annual average PM2.5 concentration reaching 89.5 micrograms per cubic meter in 2013. Confronted with this critical challenge, Beijing launched an unprecedented 'blue sky defense war.'

The city's comprehensive efforts have targeted various sources of pollution, including:

• Mobile sources
• Coal combustion
• Industrial activities
• Fugitive dust
• Daily life sources

Regional joint prevention, control, and treatment of air pollution have also been implemented across the Beijing-Tianjin-Hebei region, contributing to the overall improvement.

Policy Framework and International Recognition

China's broader 'war on pollution' began in 2013 with the launch of its Air Pollution Prevention and Control Action Plan (APPCAP), a comprehensive national policy framework aimed at improving air quality. Beijing has been at the forefront of these efforts, adopting scientific governance, institutional innovation, and regional collaboration. The United Nations Environment Programme has previously lauded Beijing's achievements in improving air quality, referring to it as the 'Beijing Miracle.'

Looking Ahead: Continued Commitment

Despite the significant progress, officials acknowledge that the improvements in air quality need to be fully secured, as regional emissions of atmospheric pollutants remain high. Liu Baoxian, deputy director of the Beijing Municipal Ecology and Environment Bureau, stated that the city will remain committed to its long-term goals over the next five years. This commitment includes prioritizing PM2.5 management, combining pollution reduction with carbon mitigation, and carrying forward initiatives such as the 'Every 0.1 Microgram Counts' program, which followed the '1 microgram initiative' launched in 2018.