Recent Increase in Atmospheric Concentration of Nitrogen(I) Oxide at Ryori in Japan

Abstract
Daily chromatographic investigation of the nitrogen(I) oxide content of the atmosphere at Ryori in Japan has shown a steep increase in concentration during the 1990s. The incremental increase was 5–9 ppbv, compared with the world-wide estimate for 1975–1985 of 1 ppbv.
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