NEW from us: China's key air quality regions met their modest PM2.5 targets last winter, as cuts in heating sector emissions offset effect of swelling industrial output. But, much faster progress needed to "eliminate heavy smog days" by 2025, as targeted.
energyandcleanair.org/china-winter-2…
energyandcleanair.org/china-winter-2…
The target to "basically eliminate heavy smog" by 2025 is a nationwide one, and requires action both in current priority regions and other areas, particularly northeast (Heilongjiang) and industrialized areas of north and northwest (Inner Mongolia, Xinjiang). 
This interactive shows the origins of all heavy smog days in the most affected city of each province, showing where emissions cuts need to be targeted to improve air quality during the worst pollution episodes.
energyandcleanair.org/china-winter20…
energyandcleanair.org/china-winter20…
The city of Beijing saw a big jump in PM2.5 levels in Jan-Mar 2021, compared with the same period in 2019, missing its target. Our modeling indicates that the reason was highly unfavorable weather conditions, not an increase in emissions.
Air quality action in China is mainly driven by heavy pollution episodes in the top cities, but requires coordinated measures across large regions. Here are the origins of heavy smog in Beijing - heavily industrialized areas more than 500km away contributed to the episodes.
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