Particles were collected daily in three fractions on glass fiber filters (GFF, Whatman) of different sizes (20.3 × 25.4 cm2 for PM1 and 10 × 12 cm2 for PM2.5 and PM10) using a HVS (Model VFC, Anderson, USA) with a PM10 head equipped with a cascade impactor. The sampling period lasted one year from January 2018 to January 2019. Particles had collected over 24-h intervals at the 1.1 m3.min-1 flow rate. The fiber filters had previously backed in a chamber at constant temperature and relative humidity. Each filter was enveloped in aluminum foil (USEPA-Method IO-3.1 1999). The glass fiber filters used for particulate matter collection had weighted before and after sampling at the same percentage relative humidity (RH). The PM-enriched filters were enveloped aluminum foils and stored at a low temperature (4 °C) until analysis to preserve analytes from decomposition.

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