A study suggests that the indoor air pollution can easily be 3 – 5 times worse than outdoor air pollution. This is because when you are out, air does not tend to be trapped. When you are indoors, it takes a lot of time for fresh air to be supplied to every corner of the premises.
This is why your air purifiers should always be functional whenever you are indoors. Also, avoid smoking with doors and windows closed. It is reported that indoor smoking can lessen your life expectancy up to 30%.