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Passive air sampling of gaseous mercury (Hg) requires a high\udlevel\udof accuracy to discriminate small differences in atmospheric\udconcentrations. Meteorological parameters have the potential to\uddecrease this accuracy by impacting the sampling rate (SR), i.e.,\udthe volume of air that is effectively stripped of gaseous mercury\udper unit of time. We measured the SR of a recently calibrated\udpassive air sampler for gaseous Hg in the laboratory under varying\udwind speeds (wind still to 6 m s−1), temperatures (−15\udto +35 °C), and relative humidities (44 to\ud80 %). While relative humidity has no impact on SR, SR increases\udslightly with both wind speed (0.003 m3 day−1\udincrease in SR or 2.5 % of the previously calibrated SR for\udevery m s−1 increase for wind speeds  > 1 m s−1, typical of outdoor deployments) and\udtemperature (0.001 m3 day−1 increase in SR or\ud0.7 % for every 1 °C increase). The temperature\uddependence can be fully explained by the effect of temperature on\udthe molecular diffusivity of gaseous mercury in air. Although these\udeffects are relatively small, accuracy can be improved by adjusting\udSRs using measured or estimated temperature and wind speed data at\udor near sampling sites. We also assessed the possibility of reusing\udRadiello® diffusive barriers previously used in\udthe passive air samplers. The mean rate of gaseous Hg uptake was not\udsignificantly different between new and previously used diffusive\udbarriers in both lab and outdoor deployments, irrespective of the\udapplied cleaning procedure. No memory effect from\udRadiellos® previously deployed in a high Hg\udatmosphere was observed. However, a loss in replicate precision for\udthe dirtiest Radiellos® in the indoor experiment\udsuggests that cleaning is advisable prior to reuse

The effects of meteorological parameters and diffusive barrier reuse on the sampling rate of a passive air sampler for gaseous mercury