LOAC (Light Optical Aerosol Counter)
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Counting measurements can be converted to PM 2.5 and PM10 mass concentrations (µg/m3) 
 
Mean densities used from speciation results: 
1.6 g/cm3 for carbon 
2.2 g/cm3 for minerals and salts
Comparison with microbalance 
measurements from Airparif ambient air network