For the minute NOx concentration data collected at Shangdianzi station in 2018, firstly, the observer level quality control is carried out; secondly, the hour data is generated by expert level quality control with the support of data quality control software; and then the day data set is synthesized from the hour data. The daily data set includes information such as collection time, device name, data value, maximum value, maximum value (datavaluetmx), minimum value (datavaluemin), minimum value occurrence time (datavaluetmn). It can be used for daily change analysis of nitrogen oxide data of main air pollution gases.
Te42i TL NOx analyzer produced by Thermo Fisher company was used to collect the concentration data of NOx at minute level. The data unit was ppb and the data format was excel (*. XLS).
First, the original data is filtered by singular value, zero span check and other processes to eliminate the problematic observation data. Then the data are corrected according to the calibration curve, and the hourly and daily mean values are calculated according to the effective data.
The data quality is good after the quality control of observer level and expert level.
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CSTR:11738.11.ncdc.SDZRAW.2020.26
10.12072/ncdc.sdzraw.db2939.2023