I can answer that. Yes, it is.
All indoor air is polluted to a certain degree, and if you're on the tail end of winter when the house has been closed up for heating purposes for a few months, it's very polluted right now.
It still may be too cold to open the windows and doors and let the house air out, which is the best and most frugal way to clean the air, but there is another way to clean it up and make your home fresh again. No, you don't need to use an electric air cleaner that contributes its own pollution and costs you to operate.
Check out the article "A Simple Solution to Indoor Pollution" and you'll see what I mean.
This solution will outlast any air cleaner and it's a lot more pleasant to look at.