Better be safe ...

These days it's really quite a good idea to be having quality air purifiers, specially if you live in a city where the smog can be quite terrible at times. Some children (as well as adults) have been known to develop respiratory problems because of polluted air and I guess that it can weaken one's immune system, too.

It's a good thing that my family and I aren't that susceptible to respiratory problems, but it never hurts to be safe. :)