AS/NZS 3580.9.14:2013 PDF
Specifies a gravimetric method using a high volume sampler with size selective inlet for determining the mean concentration of suspended particles less than 2.5 mm in ambient air.
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Methods for sampling and analysis of ambient air, Method 9.14: Determination of suspended particulate matter – PM2.5 high volume sampler with size selective inlet – Gravimetric method
standard by Standards Australia / Standards New Zealand , 04/26/2013