If you really wanted to there are indoor air filter machines that you can buy to help clean the air, (I have one of these) also frequently dusting you house with an approved cleaner can stop allergy's as moving around can cause dust to go flying around. Now if this is a humidity problem you can buy a humidifier, now the hot air humidifiers are not good so your best bet would be to get a cool air humidifier witch uses high speed movement to create humidity. (I also have one of these)
