没有字的回音♪★ @echo.moe · Feb 7 1 / 2
BreezoMeter (along with Apple Weather and Google Maps Platform Air Quality API) uses 25°C as the standard temperature and pressure (STP) for converting µg/m³ to ppb, even in European regions.
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If you are interesting in conversion of ppb and ug/m3, there is a good article: aqicn.org/faq/2015-09-...