Indoor air monitor / Product design

In the serious pollution of the air today,how can we go to let us as little as possible damage from air
pollution,In the outdoor air we have no way to let them restore it to its initial state ,But we can
let us better indoor air.How to know what kind of indoor air is, if qualified, for this problem,
I designed a indoor air monitoring device. Real-time display device on it will let you know the
indoor air quality at any time.