World Health Organization - conversion

Would you consider adding a WHO conversion factor to the list of those currently available? Standards matter and relying upon US EPA’s conversion under estimates the impact of air pollution on human health. The differences between the EPA and WHO standards are substantial. Below is a comparison of the two standards for PM 2.5.

  …………. 24 hour……..   Annual

EPA……… 35 mg/m3……… 12 mg/m3
WHO……. 15 mg/m3………… 5 mg/m3

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I’m still waiting for a reply (11/30/23). Is there a technical reason for not including a WHO conversion factor? It would seem pretty straight forward.

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