How many days a year is foggy in Ningbo?

Haze days in Ningbo in recent four years: 20 1 1 year 12 1 day; 20 12 96 days; 20 13 138 days; 20 14 1 18 days. Smog weather is a "health killer" for patients with cardiovascular diseases, especially the elderly with respiratory diseases and cardiovascular diseases. It is best not to go out in foggy days, and it is not suitable for morning exercise, otherwise it may induce diseases and even heart attacks, which may be life-threatening. Let Tianjing's WeChat help you, the filtration efficiency is 99.8% for particles as small as 0. 1 micron, and 99.9% for bacteria or virus carriers as small as 0.3 micron (common in droplets).