On December 8, 2015, Beijing found itself in a crisis. Schools were closed, construction halted, and only a few cars ventured onto the streets. The atmosphere was deemed unbreathable, marking the first time the government issued a red alert for pollution. This action protocol established four levels of response to air quality issues. That day is often seen as a pivotal moment in the city’s struggle against air pollution.
Transformative Strides in Air Quality
Fast forward just over a decade, and Beijing is now one of the Chinese cities with the best air quality. Despite ongoing pollution issues across the country, data show that the capital has emerged from a time filled with dense smog. This remarkable turnaround is primarily attributable to extensive investments aimed at cleaning up transportation.
Comparative Air Quality: Beijing vs. Madrid
On that fateful December day in 2015, Beijing reported a staggering 291 micrograms per cubic meter of PM2.5 particles, which are ultrafine and notably harmful to human health. For context, the World Health Organization (WHO) recommends that levels should not exceed 25 micrograms per cubic meter. In 2013, the annual average was an even higher 89.5 micrograms. As of last year, however, the situation had drastically improved. According to the Beijing Municipal Ecology and Environment Bureau, average levels of PM2.5 dropped to 27 micrograms per cubic meter, surpassing the air quality in Madrid, which recorded an average of 31 micrograms.
A Journey of Improvement
The decline in air pollution is not merely incremental; it’s transformative. Remarkably, in recent years, the city has successfully maintained average annual levels below 30 micrograms for the first time in history. In 2025 alone, 311 days were classified as having excellent air quality.
Implementing Change: Strategies Against Pollution
Beijing’s campaign against pollution took its first significant steps during the 2008 Olympic Games. However, effective measures were not implemented until 2013. Over a million coal-fired boilers were replaced with gas or electric versions, and more than 600,000 new energy vehicles—including electric and plug-in hybrids—were introduced into the city.
Additionally, to significantly impact urban mobility, the government removed 1.9 million old and polluting cars from the roads. The introduction of low emission zones and strict vehicle regulations played crucial roles in achieving this change. Vehicles had to stay off the roads on alternating days based on their license plates during high pollution episodes.
A Model for the World
The evolution of Beijing’s air quality is so striking that it has become a reference point for other heavily polluted cities, including New Delhi. This transformation illustrates that substantial, concerted efforts can yield visible results in urban air quality, proving that other cities can learn valuable lessons from Beijing’s journey.
With these achievements, Beijing stands as a beacon of hope for improved air quality globally, demonstrating that change is possible when action is taken.
Photo Credits: zhang kaiyv and Quique Olivar.