Hi all,

I'm having difficulty understanding what Concentration Limit to apply for Particulate Matter (PM10 and PM2.5) under V4.1 BD+C.

For PM10, does an ISO 14644-1:2015 limit apply in addition to 50 μg/m3 or 20 μg/m3 (Healthcare only) limits?

I was recently advised that PM2.5 only applies to health facilities under V4.1, but I don't see an indication of that in the ratings system or the "Getting started guide for beta participants". Was wondering if someone might be able to confirm.

Lastly, the "Getting started guide" states that "separate U.S. EPA NAAQS thresholds for PM2.5 and PM10 as well as gravimetric test methods for particulate matter are no longer required to be met" (p. 225; my emphasis). However, the PM2.5 Concentration Limits of 12 or 35 μg/m3 (depending on site location outside/inside EPA non-attainment zone) are from EPA NAAQS, are they not?

Any insight would be much appreciated! Thanks very much.