what is air advice measuring in terms of particulate matter?

[Guest guest]

I’m looking at an air advice report.  They are reporting ug/m3 “particle

allergen†.  The data is presented as a timeline that looks to me like what I

get out of a laser particle counter.  I do not believe they are actually somehow

sampling allergens continuously.

Does anyone know what they are actually sampling?  If, as I

suspect it’s a laser particle counter any idea what the size cuts are and how

they are converting particle counts to ug/m3?

Thanks

Terry Brennan