Sites that sell air filtration products over the Internet for home use should be submitted to Shopping/Home_and_Garden/Climate_Control/Air_Cleaners.
Sites on the topic of asbestos hazards should be submitted to Health/Occupational_Health_and_Safety/Hazardous_Substances/Asbestos.
Sites that discuss general environmental health for humans should be submitted to Science/Environment/Environmental_Health or the appropriate subcategory.
Sites which are primarily concerned with secondhand smoke health issues should be submitted to Society/Issues/Health/Tobacco/Secondhand_Smoke.
Firms with a limited service area, such as furnace service or duct cleaning firms, should be submitted to a Regional category.
Sites offering online, mail order, or telephone shopping for residential air cleaning devices should be submitted to: Shopping/Home_and_Garden/Climate_Control/Air_Cleaners
Submit cleanroom equipment sites to Business/Electronics_and_Electrical/Production_Equipment_and_Materials/Tools_and_Equipment/Cleanroom/