Series: NILU rapport 34/2022
On behalf of the Joint Nordic Screening Group, NILU has performed a study on short, medium and long-chain chlorinated paraffins in air samples from urban sites in the capitals of Finland, Iceland and Norway. Air samples were collected in two seasons in 2022; in wintertime when studded tires were used, and in summertime when normal tires were used. The highest concentrations were measured for MCCPs in Helsinki and LCCPs in Reykjavik. A majority of the samples from Helsinki (71%) had LCCPs levels below the field blanks, and a majority of the samples from Oslo (100% in summer and 60% in winter) had SCCPs levels below the field blanks. The concentrations of MCCPs were higher than the concentrations of SCCPs. For all sites except Reykjavik, the concentrations of LCCPs were similar to concentrations of SCCPs. The results for Helsinki and Oslo indicate higher concentrations in wintertime than summertime.