Abstract

The results of measurements of surface concentrations of nitrogen oxides NO_x (NO and NO₂) performed at the atmospheric monitoring station near Saint Petersburg (Petergof, 59.88° N, 29.83° E) in 2012–2018 are presented. The main patterns of the temporal variability of NO_x concentrations typical for the urban atmosphere of a large megacity (seasonal, daily, and weekly variations) are revealed. On average, NO_x concentrations in summer are lower than in the cold season. The average daily variations are characterized by two pronounced peaks: in the morning and late at night, which are separated by the periods of relatively low concentrations during the day and early in the morning. The weekly variations in NO_x concentration due to the cyclic pattern of urban economic and business activity are manifested in a noticeable decrease in the average NO_x concentration on Sunday relative to its maximum level on weekdays (by 17% for NO₂ and by 33% for NO). Based on the distribution of the average NO_x concentration depending on the directions of surface wind, a rough estimate of the average NO₂ concentration in Saint Petersburg was obtained: 41 µg/m³, which is close to the average annual maximum permissible concentration (40 µg/m³).

中文翻译：

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圣彼得堡附近大气表层中氮氧化物的变化

摘要

的氮氧化物的浓度表面的测定结果NO _X（NO和NO ₂）在接近圣彼得堡（彼得宫城，59.88°N，29.83。E）在2012年至2018年的大气监测站执行被呈现。NO的时间上的变化的主图案_X的浓度典型为一个大的大城市（季节性，每日和每周变化）揭示的城市气氛。平均而言，夏季的NO _x浓度低于寒冷季节。日平均变化的特征是两个明显的高峰：早晨和深夜，由白天和清晨相对较低的浓度时段隔开。NO _x的每周变化浓度由于城市经济和商业活动的循环模式表现在在平均NO明显减少_X浓度在周日相对于其最大电平在工作日（17％为NO ₂和33％为NO）。基于平均NO的分布_X取决于表面的风的方向的浓度，平均NO的粗略估计₂获得在圣彼得堡浓度：41微克/米³，这是接近年均最大容许浓度（ 40 µg / m ³）。