if they didn't keep their doors and windows open all day long in the winter? I'm told the reason to open the windows is for fresh air. But the air in many places in China is far from fresh. Some days I can see it in the hallways of my school. Between November and February I think my city had about 10 days where we could see "blue" sky. I say "blue" because when I climb the mountains near my home I can still see the haze settled over the city. Many businesses, schools, and hospitals leave the doors open all day, yet they are running heaters within these buildings. Those heaters are usually in addition to the government controlled radiant heat systems, that don't work that great, built into most buildings. On top of that, many people still wear their winter coats inside. My students stay in theirs all day. So as most buildings are cold enough as it is in the winter, wouldn't it be better to keep the windows and doors closed, and buy a few plants to freshen the air?
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