4 ms·
They already do, in a sense. The scale used here is different from the internationally used and the categories imply lesser health effects.
by tellarin 2y ago
They already do, in a sense. The scale used here is different from the internationally used and the categories imply lesser health effects.
- homebrewer 2y agoTo be slightly more specific, Chinese authorities consider PM2.5 levels of ≤70 mcg/m³ as safe, while by EU standards that same pollution level is considered "extreme". The WHO yearly recommended limit is 5 mcg/m³, by the way.
- insane_dreamer 2y agoTo give you an idea of the difference in perception. When we lived in Beijing, anything below 150 mcg/m3 was a "good day", <50 was "amazing". We didn't start taking any precautions like closing windows until it was >250. We stayed indoors when it was >400 or >500.