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並前往https://aqicn.org/faq/2015-09-06/ozone-aqi-using-concentrations-in-milligrams-or-ppb/hk/

臭氧AQI：使用的濃度是毫克還是ppb ？

First, ppm (parts per million ) and ppb (parts per billion) are defined as `1 ppm ... O3 - Ozone, 1 ppb = `1,97` µg/m3, 1 ppb = `2,00` µg/m3 ...

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