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Outline
Assessment of photochemical losses is essential for characterizing VOC pollution and apportioning its sources. Continuous online monitoring of VOCs was conducted in urban Wuhan from September 8 to 18, 2021, capturing two ozone pollution episodes with active photochemical reactions. The parameterized method based on photochemical age was employed to correct observed VOC concentrations (Ob) for photochemical losses, deriving initial concentrations (In) for pollution characterization. Source apportionment was performed using the Positive Matrix Factorization (PMF) model. Results indicate that alkenes exhibited the highest photochemical loss concentrations and ozone formation potential (OFP) among VOC categories, identifying them as key species governing ozone pollution. PMF analysis based on initial and observed values identified six major emission sources with concentration contributions (initial, observed) as follows: vehicle emissions (16.5%, 17.7%), industrial chemical emissions (14.7%, 13.7%), biogenic sources (4.6%, 4.0%), combustion sources (20.2%, 33.1%), LPG/NG usage (21.1%, 18.9%), and solvent use (22.9%, 12.6%). The PMF results were significantly influenced by photochemical reactions, underscoring the necessity of employing initial VOC concentrations in source apportionment to avoid underestimating contributions from solvent use, LPG/NG sources, biogenic emissions, and industrial chemical sources.
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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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