17-7 主な大気汚染物質の環境基準達成率及び年平均濃度（平成17年度～令和元年度）Rate of Environmental Standard Achievements and Annual Average Density of Major Air Pollutants (F.Y. 2005 to 2019)有効測定局数Number of valid measuring stations年度二酸化窒素浮遊粒子状物質光化学オキシダント二酸化硫黄一酸化炭素微小粒子状物質（PM2.5）Fiscal yearNitrogen dioxideSuspended particulatematterPhotochemicaloxidantSulfur dioxideCarbon monoxideFine particulate matter一般環境大気測定局Ambient air pollution monitoring stations平成17年20051,4241,4801,1571,31991...2220101,3321,3741,1501,11470342720151,2531,3021,14497457765令和元年20191,2161,2661,13691956835自動車排出ガス測定局Roadside air pollution monitoring stations平成17年20054374112785304...2220104163993368258122720154023932951232219令和元年20193833723047220238環境基準達成率Rate of environmental standard achievements(%) 1)年度二酸化窒素浮遊粒子状物質光化学オキシダント二酸化硫黄一酸化炭素微小粒子状物質（PM2.5）Fiscal yearNitrogen dioxideSuspended particulatematterPhotochemicaloxidantSulfur dioxideCarbon monoxideFine particulate matter一般環境大気測定局Ambient air pollution monitoring stations平成17年200599.996.40.399.7100.0...222010100.093.00.099.7100.032.4272015100.099.60.099.9100.074.5令和元年2019100.0100.00.299.8100.098.7自動車排出ガス測定局Roadside air pollution monitoring stations平成17年200591.393.70.0100.0100.0...22201097.893.00.0100.0100.08.327201599.899.70.0100.0100.058.4令和元年2019100.0100.00.0100.0100.098.3年平均濃度Annual average density年度二酸化窒素浮遊粒子状物質光化学オキシダント二酸化硫黄一酸化炭素微小粒子状物質（PM2.5）Fiscal yearNitrogen dioxideSuspended particulatematterPhotochemicaloxidantSulfur dioxideCarbon monoxideFine particulate matter(ppm)(mg/m3)(ppm) 2)(ppm)(ppm)(μg/m3)一般環境大気測定局Ambient air pollution monitoring stations平成17年20050.0150.0270.0470.0040.4...2220100.0110.0210.0480.0030.315.12720150.0100.0190.0480.0020.313.1令和元年20190.0080.0150.0470.0020.29.8自動車排出ガス測定局Roadside air pollution monitoring stations平成17年20050.0270.0310.0380.0040.6...2220100.0220.0230.0430.0030.517.22720150.0190.0200.0440.0020.413.9令和元年20190.0150.0150.0440.0020.310.41) 有効測定局のうち環境基準を達成した局の割合。 2) 昼間の日最高１時間値。資料 環境省「大気汚染状況について」Source: Ministry of the Environment. 有効測定局は，環境基準適用局のうち年間測定時間が6,000時間以上（光化学オキシダントを除く）の測定局をいい，微小粒子状物質の有効測定局は，測定している機器が標準測定法と等価性のあるもので，かつ年間測定日数が250日以上の測定局をいう。 "Valid measuring station" refers to a measuring station which measured 6,000 hours or more (except for the case ofphotochemical oxidant) in the respective year. A valid measuring station for fine particulate matters refers to a measuringstation which is equipped with a measuring instrument of equivalent capability to the standard measurement method andwhich measured 250 days or more in the respective year.1) The percentage of valid measuring stations where environmental standards are satisfied. 2) Maximum of one-hour valuein the daytime.404 17 環境
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