HOW MANY DAYS IN A YEAR CAN MT. FUJI AND THE TOKYO-TOWER BE SEEN FROMTHE TOKYO SUBURBAN AREA

Mt. Fuji and the Tokyo Tower were observed daily from the Seikei Meteo rological Observatory in Tokyo for the past 30 years. The observatory recorded whether each object could be seen at 9:00 a.m. Mt. Fuji and t he Tokyo Tower could be seen, on average, 43 days yr(-1) and 69 days y r(-1), respectively, from 1963 to 1972. From 1967 to 1972, the Tokyo T ower was visible fewer days than Mt. Fuji, even though Mt. Fuji is far ther from the observatory In contrast, after 1973, Mt Fuji could be se en about 70 days yr(-1) on average, and the number of days the tower w as visible increased to 159 days yr(-1) in 1993. The data obtained fro m such unique and simple observations bear a significant relationship to air pollution;around the Tokyo megalopolis.