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The EPA current standard is 53ppb, but actually the WHO in September set their recommended AQG target at 10 micrograms per cubic meter with 3 step-down interim
by BugsJustFindMe 5y ago
The EPA current standard is 53ppb, but actually the WHO in September set their recommended AQG target at 10 micrograms per cubic meter with 3 step-down interim targets of 40,30,20.
10 micrograms per cubic meter of NO2 is 5.3ppb. (conversion factor is 1.88ugm3/1ppb)
You can read it here: https://apps.who.int/iris/handle/10665/345329 https://apps.who.int/iris/handle/10665/345329
- heartbreak 5y agoIs the WHO value for indoor air quality? Why would WHO and EPA deviate by an order of magnitude?
- BugsJustFindMe 5y agoThe EPA value is a limit for today. The WHO value is a recommendation for the future target after some industry accommodation period. Essentially "what it is" vs "what it should be".