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並前往https://www.euro.who.int/__data/assets/pdf_file/0017/123056/AQG2ndEd_5_2benzene.pdf

Chapter 5.2 Benzene - WHO/Europe

Daily median air concentrations in the USA have been reported as follows: remote areas, 0.51. µg/m3 (0.16 ppb); rural areas, 1.50 µg/m3 (0.47 ppb); and urban/ ...

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