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Surface CO and ozone data were obtained in 1998 at Happo (36.7 o N, 137.8 o E, altitude 1840m) in Japan. Backward trajectory analysis was applied to get the origin of the air mass to the measuring site. The air mass is basically coming from the west over the Asian continent except during summer. A maritime air mass prevails in the summertime, due to a dominant high-pressure system...
The mixing ratios of surface ozone at two rural/remote sites in Thailand, Inthanon and Srinakarin, have been measured continuously for the first time. Almost identical seasonal variations of O 3 with dry season maximum and a wet season minimum with a large seasonal amplitude are observed at both sites during 1996-1998. At Inthanon, the monthly averaged O 3 mixing ratios range 9-55ppb,...
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