Since homes have become more airtight, in an effort to improve energy efficiency and lower electrical consumption, this has lead to an interesting and unexpected condition: indoor air pollution. The level of indoor air pollution you experience in your home will vary, but if you have your doors and windows sealed tight against the weather, there is no doubt that there is a problem in your home environment, whether you can see it or not. Consider HEPA air cleaners and HEPA air purifiers as real solutions.