To what extent is the description of streets important in estimating local air quality: a case study over Paris

Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(1), P. 93 - 117

Published: Jan. 7, 2025

Abstract. Modeling atmospheric composition at street level is challenging because pollutant concentrations within canyons depend on both local emissions and the transport of polluted air masses from remote areas. Therefore, regional-scale modeling applications must be combined to provide accurate simulations locations. In our study, we compare two strategies: (i) a subgrid-scale approach embedded in chemistry–transport model (denoted Subgrid) (ii) street-network MUNICH (Model Urban Network Intersecting Canyons Highways). cases, CHIMERE provides urban background concentrations, meteorological Weather Research Forecasting (WRF), coupled with CHIMERE, used fields. Simulation results for NOx, NO2, PM2.5 over city Paris approaches are compared situ measurements traffic quality stations. At stations located downtown areas, low emissions, exhibits superior performance Subgrid NOx while comparable obtained NO2. However, significant discrepancies between methods observed all analyzed pollutants heavily influenced by road traffic. These typically near highways, where difference can reach 58 %. The ability estimate emission data limited, leading potential underestimation or overestimation gas fine-particle based heterogeneity it handles. appears highly sensitive friction velocity, parameter anthropogenic heat flux WRF model. Street dimensions do contribute disparities approaches, yet remain predominant factor.

Language: Английский

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Modelling molecular composition of SOA from toluene photo-oxidation at urban and street scales

Environmental Science Atmospheres, Journal Year: 2024, Volume and Issue: 4(8), P. 839 - 847

Published: Jan. 1, 2024

Near-explicit chemical mechanisms representing toluene SOA formation are reduced using the GENOA algorithm and used in 3D simulations of air quality over Greater Paris streets a district near Paris.

Language: Английский

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Multiyear high-temporal-resolution measurements of submicron aerosols at 13 French urban sites: data processing and chemical composition

Earth system science data, Journal Year: 2024, Volume and Issue: 16(11), P. 5089 - 5109

Published: Nov. 5, 2024

Abstract. This paper presents a first comprehensive analysis of long-term measurements atmospheric aerosol components from chemical speciation monitor (ACSM) and multiwavelength Aethalometer (AE33) instruments collected between 2015 2021 at 13 (sub)urban sites as part the French CARA (Chemical Characterization Particles) program. The datasets contain mass concentrations major species within submicron aerosols (PM1), namely organic (OAs), nitrate (NO3-), ammonium (NH4+), sulfate (SO42-), non-sea-salt chloride (Cl−), equivalent black carbon (eBC). Rigorous quality control, technical validation, environmental evaluation processes were applied, adhering to both guidance Reference Laboratory for Air Quality Monitoring (LCSQA) Aerosol, Clouds, Trace Gases Research Infrastructure (ACTRIS) standard operating procedures. Key findings include geographical differences in composition, seasonal variations, diel patterns, which are influenced by meteorological conditions, anthropogenic activities, proximity emission sources. Overall, OA dominates PM1 each site (43 %–60 % total mass), showing distinct seasonality with higher (i) winter, due enhanced residential heating emissions, (ii) summer, increased photochemistry favoring secondary formation. NO3 is second most important contributor (15 %–30 %), peaking late winter early spring, especially northern France, playing significant role during pollution episodes. SO4 (8 %–14 %) eBC (5 %–11 complement fine-aerosol species, their relative contributions strongly origin air masses stability respectively. A comparison 3D transport model (CTM) CHIMERE shows high correlations simulations measurements, albeit an concentration underestimation 46 %–76 %. Regional discrepancies levels emphasize importance these respect validating models tailoring mitigation strategies. can be found https://doi.org/10.5281/zenodo.13318298 (Chebaicheb et al., 2024).

Language: Английский

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Contributions of fossil and non-fossil fractions to total carbon in urban aerosols in Bratislava (Slovakia)

Journal of Environmental Radioactivity, Journal Year: 2024, Volume and Issue: 278, P. 107512 - 107512

Published: Aug. 7, 2024

Language: Английский

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Mixing state and evolutionary mechanism of oxalic acid homologs in Liaocheng, East China: Insights from seasonal and hourly observations

Particuology, Journal Year: 2024, Volume and Issue: 95, P. 223 - 234

Published: Sept. 25, 2024

Language: Английский

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