有効測定局数二酸化窒素浮遊粒子状物質年度一般環境大気測定局自動車排出ガス測定局環境基準達成率年度二酸化窒素浮遊粒子状物質一般環境大気測定局自動車排出ガス測定局年平均濃度年度二酸化窒素浮遊粒子状物質一般環境大気測定局自動車排出ガス測定局光化学二酸化硫黄一酸化炭素二酸化硫黄一酸化炭素光化学二酸化硫黄一酸化炭素微小粒子状物質（PM2.5）（PM2.5）微小粒子状物質（PM2.5） 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.平成17年200520102015令和2年20202227平成17年200520102015令和2年20202227平成17年200520102015令和2年20202227平成17年200520102015令和2年20202227平成17年200520102015令和2年20202227平成17年200520102015令和2年202022271) 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。1) The percentage of valid measuring stations where environmental standards are satisfied. 2) Maximum of one-hour valuein the daytime.資料 環境省「大気汚染状況について」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２年度）Rate of Environmental Standard Achievements and Annual Average Density of Major Air Pollutants (F.Y. 2005 to 2020)Fiscal yearFiscal yearFiscal yearNitrogen dioxide1,4241,3321,2531,208437416402374Nitrogen dioxide99.9100.0100.0100.091.397.899.8100.0Nitrogen dioxide(ppm)0.0150.0110.0100.0070.0270.0220.0190.014Suspended particulatematter1,4801,3741,3021,272411399393367Suspended particulatematter96.493.099.699.993.793.099.7100.0Suspended particulatematter(mg/m3)0.0270.0210.0190.0140.0310.0230.0200.015Source: Ministry of the Environment.オキシダントPhotochemicalオキシダントPhotochemicalオキシダントPhotochemicalNumber of valid measuring stationsSulfur dioxideCarbon monoxideFine particulate matteroxidantAmbient air pollution monitoring stations1,1571,1441,1441,1551,3191,114974913Roadside air pollution monitoring stations2733293185685145Rate of environmental standard achievements光化学oxidantSulfur dioxideCarbon monoxideFine particulate matterAmbient air pollution monitoring stations0.30.00.00.299.799.799.999.7Roadside air pollution monitoring stations0.00.00.00.0100.0100.0100.0100.0Annual average densitySulfur dioxideCarbon monoxideFine particulate matteroxidant(ppm) 2)(ppm)Ambient air pollution monitoring stations0.0470.0480.0480.0460.0040.0030.0020.001Roadside air pollution monitoring stations0.0380.0430.0440.0440.0040.0030.0020.00191705755304258232220100.0100.0100.0100.0100.0100.0100.0100.0(ppm)(μg/m3)0.40.30.30.20.60.50.40.3...34765844...12219237(%) 1)微小粒子状物質...32.474.598.3...8.358.498.3...15.113.19.5...17.213.910.0406 17 環境
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