Measurements of gaseous SO
2, NH
3, and O
3 using IVL passive sampler technology were obtained during a pilot measurement program initiated as a key component of the newly established WMO/GAW Urban ...Research Meteorology and Environment (GURME) project. Monthly measurements were obtained at 50 stations in Asia, Africa, South America, and Europe. The median SO
2 concentrations vary from a high of 13
ppb at Linan, China, to <0.03
ppb at four stations. At 30 of 50 regional stations, the observed median concentrations are <1
ppb. Median ammonia concentrations range from 20
ppb at Dhangadi, India, to <1
ppb at nine stations. At 27 of regional stations, the ambient ammonia levels exceed 1
ppb. The median ozone concentrations vary from a maximum of 45
ppb at Waliguan Mountain, China, to 8
ppb in Petit Saut, French Guiana. In general, the highest ozone values are found in the mid-latitudes, with the Northern hemisphere mid-latitude values exceeding the Southern hemisphere mid-latitude levels, and the lowest values are typically found in the tropical regions.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
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