Comparions of Air Cleaner Products Positive Effect  Negative Effect
Product Type	Remove odor	Kill Bacteria	Remove formaldehyde and related harmful gases	Any strange smell	Effect on Human body	Product Life span
Negative Ionizer 负离子发生器	Good	Excellent	Good	No smell	Beneficial, improve oxygen intake	Semi-permanent
Photocatalysis 光触媒	Good	Excellent	Good	No smell	No Effect	5 to 10 years
Activated Carbon Adsorption 活性炭吸附类	Rather Good	No Effect	Certain Effect	No smell	No Effect	Short term, easily saturate
Fitment Odor Remover 装修除味剂	Good	No Effect	Rather Good	Irritating smell	Minimum Effect	Short term
Fragrance Spray 芳香剂掩蔽类	Rather Good	No Effect	No Effect	Fragrance	Some are Harmful	Short term
Formaldehyde Removal 甲醛捕捉剂	No Effect	No Effect	Effect only one	Irritating smell	Caused 2^nd time of pollution	Medium to long term
Enzyme 生物酶类	No Effect	Certain Effect	Normal	Irritating smell	Harmless	Short term
Ozone Generator 臭氧发生器	Normal	Normal	Normal	Strange smell	Harmful if too much Ozone	Depend on usage
Bacteria Remover Spray 杀菌剂	No Effect	Normal	No Effect	Strange smell	Certain Effect	Short term
Ultraviolet Germicidal Lamps 紫外灯	No Effect	Normal	No Effect	Ozone produce	Harmful	Depend on usage
Plant Adsorption 植物吸附	Normal	No Effect	Normal	Comfortable	Beneficial	Long term