The worst year of smog in Beijing

The worst year of smog in Beijing may be 20 14. Specifically, on February 20 -26, 20 14, there was a severe smog weather in Beijing that lasted for 7 days, the longest duration and the most serious air quality in Beijing in recent years. The heating period in winter is usually the worst period of smog in Beijing, and the air index fluctuates obviously during this period. The most serious is 65438+ 10 month, followed by 65438+February.