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As a typical photochemical product, atmospheric peroxyacetyl nitrate (PAN), which has received widespread attention for the important role it plays in atmospheric photochemical processes, has been studied relatively late due to difficulties in monitoring. In order to deeply investigate the concentration level of PAN and its generation mechanism in industrial cities, this study conducted online observations of PAN and other pollutants for one year from March 2023 to February 2024 in Zibo City, North China Plain. The average concentration of PAN during the study period was 1.09×10-9 (0.03~10.07×10-9), and the four-seasonal concentration ranking showed a pattern of winter (2.07×10-9) > autumn (0.98×10-9) > spring (0.64×10-9) > summer (0.61×10-9). There was a significant difference in the time of occurrence of the peak daily change concentration, with the peak occurring at midday (12:00) in summer and delayed to the afternoon (17:00) in winter. The results of the generalised additive model (GAM) showed that the PAN concentration was significantly affected by temperature and atmospheric oxidability. Calculations based on the zero-dimensional box model (F0AM) showed that acetaldehyde contributed the most to peroxyacetyl (PA) (69%), followed by photolysis (18%) and oxidation (11%) of methylglyoxal, and that the loss of PA was dominated by the interaction of nitric oxide (NO) (18%) and nitrogen dioxide (NO2) (81%) with PA. The relative incremental reactivity (RIR) showed that PAN generation was sensitive to NOx. This study enriches the understanding of the characteristics of atmospheric PAN pollution and its formation mechanism in North China and provides scientific and technological support for air pollution control.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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