Particulate matter (PM10) is collected on a 24-hour basis with High Volume Sampler (approximately 700 m3 per day). Results are recorded as monthly averages. Among the measured PAHs are:
The filters are kept frozen until analysis. A quarter of a filter is extracted by Accelerated Solvent Extraction (ASE) with a mixture of dichloromethane/ hexane (50:50, v/v).