Oliveira Kevin, Guevara Marc, Kuenen Jeroen, Jorba Oriol, García-Pando Carlos Pérez, van der Gon Hugo Denier
Barcelona Supercomputing Center, Plaça Eusebi Güell 1-3, Barcelona, 08034, Spain.
Barcelona Supercomputing Center, Plaça Eusebi Güell 1-3, Barcelona, 08034, Spain.
Environ Pollut. 2025 Oct 1;382:126510. doi: 10.1016/j.envpol.2025.126510. Epub 2025 Jun 20.
Non-Methane Volatile Organic Compounds (NMVOCs) impact health and air quality, contributing to ozone and secondary organic aerosols (SOA). With stricter pollutant limits and a growing emphasis on modelling under the new European Ambient Air Quality Directive, improving NMVOC representation - particularly in terms of speciation - is essential. Current state-of-the-art European inventories rely on outdated data, potentially limiting accuracy. This study assesses for the first time the CAMS-REGv7.1 NMVOC emission inventory across Europe and evaluates the impact of replacing its default speciation with a more recent alternative using the MONARCH chemical transport model, comparing results with benzene, toluene and xylene observations for 2019. The impact of changing the speciation on modelled O is also quantified. The updated speciation shows significant changes in emissions across NMVOC species, with all species showing changes greater than ±15 %, significantly affecting their spatial distribution and sector contributions. Air quality modelling results show notable improvements for benzene (average NMB from -46.1 % to -27.7 %), primarily driven by a better split of residential wood combustion NMVOC proposed in this work. For toluene and xylenes, major overestimations previously observed in capital cities are largely reduced by improving the characterisation of solvent activities with the new speciation profiles. However, some areas showed degraded performance likely due to the over-allocation of industrial emissions in urban areas, limiting the assessment of speciation changes and worsening the overall underestimation. Despite significant changes in the split of NMVOCs, the proposed changes show minimal impact on modelled O levels, aside from localised spatial and temporal variability. The largest daily variations in MDA8 were -14 μg/m in March and +8 μg/m in May. The effects are smaller during summer, possibly due to an increasing role from biogenic emissions. Additional measurements of NMVOC species, along with more detailed model mechanisms, are needed to extend the evaluation.
非甲烷挥发性有机化合物（NMVOCs）影响健康和空气质量，会导致臭氧和二次有机气溶胶（SOA）的形成。随着污染物限值愈发严格，以及新的《欧洲环境空气质量指令》对模型构建的重视程度不断提高，改进NMVOCs的表征——尤其是在物种构成方面——至关重要。当前欧洲最先进的排放清单依赖过时的数据，这可能会限制准确性。本研究首次评估了整个欧洲的CAMS-REGv7.1 NMVOC排放清单，并使用MONARCH化学传输模型评估了用更新的替代方案取代其默认物种构成的影响，将结果与2019年苯、甲苯和二甲苯的观测数据进行了比较。还对物种构成变化对模拟臭氧的影响进行了量化。更新后的物种构成显示，NMVOCs物种的排放量有显著变化，所有物种的变化幅度均大于±15%，显著影响其空间分布和部门贡献。空气质量建模结果显示，苯的模拟效果有显著改善（平均NMB从-46.1%降至-27.7%），这主要得益于本研究中提出的对居民木材燃烧NMVOCs更好的分类。对于甲苯和二甲苯，通过采用新的物种构成概况改进溶剂活动的表征，此前在首都城市观察到的主要高估情况在很大程度上得到了减少。然而，一些地区的表现有所下降，可能是由于城市地区工业排放的过度分配，限制了对物种构成变化的评估，并加剧了总体低估情况。尽管NMVOCs的分类有显著变化，但除了局部的空间和时间变化外，提议的变化对模拟臭氧水平的影响极小。MDA8的最大日变化量在3月为-14μg/m³，在5月为+8μg/m³。夏季的影响较小，可能是由于生物源排放的作用增加。需要对NMVOCs物种进行额外测量，并采用更详细的模型机制来扩展评估。
