Japanese standard (PPM)
2- sec-butylphenyl -N- methylamino acid ester 0.0038
Acetaldehyde 0.03
Diazin 0.00002
Di (2- ethylhexyl) phthalate 0.0076
Tetradecane 0.04
Dibutyl phthalate 0.02
Chlorpyrifos 0.00007
Formaldehyde 0.08
Benzene 0.07
Xylene 0.2
Dichlorobenzene 0.04
Ethylbenzene 0.88
Styrene 0.05
At the beginning of 2005, the European Union and other countries formulated 5A indoor air quality standards in Singapore. A healthy indoor environment must meet the following five standards: 1A: comfortable and pleasant, free from dust and suspended particulate pollution; 2A: The content of volatile harmful substances such as formaldehyde and benzene is less than 0.08mg/ m3; 3A: It is good for health, and there is no pollution caused by influenza, mold, Escherichia coli and other bacteria; 4A: Fresh air, no odor, no oil smoke and no second-hand smoke; 5A: Negative ions meet the standard, and the content is close to the forest.