Characteristics analysis of ozone and its precursors in midsummer at Airport New City of Xi-Xian New Area, Shaanxi Province, China
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Abstract:
This paper is aimed at studying of high concentration ozone events in summer in Airport New City (ANC) of Xi-Xian New Area, Shaanxi Province. Online instruments were used to continuously monitor the hourly concentration of ozone and its precursor (nitrogen oxides (NOx) and volatile organic compounds (VOCs)) in ANC from 27 July to 26 August 2018(31 days). The results show that the ozone concentration is generally high during the midsummer (July & August) at ANC, and the average concentration is 103.8 μg/m3 and the maximum concentration reaches 306 μg/m3. There are 16 days when the ozone concentration exceeds the limit during the study period and its diurnal variation of concentration shows a single peak trend, with the maximum value about 17:00 p.m. and the minimum value around 6:00 a.m. The correlation coefficient between ozone and NOx is -0.648 7, and that between ozone and VOCs is -0.091 1. When VOCs/NOx is below 6.43, VOCs play a leading role in the generation of ozone, and when VOCs/NOx is above 6.43, NOx plays a decisive role in the generation of ozone.
