On: New research: natural gas appliances emit much more methane than realized

[BugsJustFindMe]

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

[heartbreak → BugsJustFindMe]

Is the WHO value for indoor air quality? Why would WHO and EPA deviate by an order of magnitude?

[BugsJustFindMe → heartbreak]

The 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".