Abstract:

Ambient concentrations of PANs and other related air pollutants were monitored at an urban site in Beijing each August from 2006 to 2014. The NO_x concentration decreased at a rate of 1.7 nL/(L/yr) (about 4%/yr), and the PAN concentration decreased at a rate of 0.03 nL/(L/yr) (about 3%/yr), while the O₃ concentration increased at a rate of 1.5 nL/(L/yr) (about 4%/yr), indicating that the measures taken to cut NO_x were effective for controlling PAN concentration. Beijing needs to strengthen the control of VOCs with reducing NO_x emissions for reducing O₃ concentration.

Key words: PAN, Beijing, regional photochemical pollution

摘要：

2006—2014年夏季, 使用PANs在线监测仪对北京大气中PANs浓度进行监测, 期间NO_x浓度以每年1.7 nL/L (约4%/a)的速率下降, PAN浓度以每年0.03 nL/L (约3%/a)的速率下降, O₃浓度却以每年1.5 nL/L(约4%/a)的速率上升, 表明这些年采取的NO_x治理措施对控制PAN浓度有效, 治理O₃需要在控制NO_x的同时加强对VOCs排放的控制。

关键词: PAN, 北京, 区域光化学污染