Is it only by choosing immigrants that we can stay away from smog?

Nowadays, air pollution is becoming more and more serious. We should not only pay attention to the harm of smog, but also pay attention to the prevention and control of other harmful gases. It is recommended to install a fresh air system at home to minimize the time outside. My home is decorated with five-degree and five-constant central air conditioning, which can not only cool and heat, but also control the indoor air at constant temperature, humidity and oxygen, which is very good.