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Atmospheric hydrogen (H2) mixing ratios were observed over a one yearperiod from summer 2007 to 2008 in Helsinki, Finland. Relatively stablebackground values of hydrogen were occasionally observed at the site, withminimum in October and maximum between March and May. High hydrogen mixingratios occurred simultaneously with high carbon monoxide (CO) values andcoincided with high traffic flow periods. Carbon monoxide and radon(222Rn) were continuously monitored at the same site and they were usedin estimation of the hydrogen emissions from traffic. The morning rush hourslope of ΔH2/ΔCO was in average 0.43±0.03 ppb (H2)/ppb (CO). After correction due to soil deposition of H2 theslope was 0.49±0.07 ppb (H2)/ppb (CO). Using this slope and COemission statistics, a road traffic emission of about 260 t (H2)/yearwas estimated for Helsinki in 2007

Atmospheric hydrogen variations and traffic emissions at an urban site in Finland