Supplementary material to "The Atmospheric Mercury Network: measurement and initial examination of an ongoing atmospheric mercury record across North America"

Supplemental Table 1: Observations of GEM (ng m -3 ) and GOM, and PBM 2.5 (pg m -3 ), by 42 site and year, including valid-only number, means, medians and data ranges. Data are 43 inclusive for valid samples January 2009 through December 2011. Several sites were 44 unavailable for this study.