People of the Han Dynasty invented the “air purifier” so long, you have seen?
In winter, the haze is becoming increasingly serious, direct harm to our health. But now developed technology, although the haze problem has not been radical, but we can use anti haze masks outdoors, indoors can purify the air using air purifiers, improve air quality to ensure good health. Then the problem has come, because the ring (air) (gas) (gas) asked (net) problem (chemical) is not only a problem and demand, so the ancient people in the face of air pollution [...]