From 'Multiple Chemical Sensitivity: My Thoughts on MCS' If lots of smoke is getting into your house even the best air purifier won’t be able to keep the air clean. Start with one room If it is difficult to make your bedroom smoke-free, sleep in a room that you can make smoke-free. Use an air purifier.Where smoke gets in and what to do about itDoors ⦁ Under the door and … [Read more...] about How to Keep Smoke out of Your House