Application of the Lasso regularisation technique in mitigating overfitting in air quality prediction models

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Jan. 2, 2025

Language: Английский

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Identify the key emission sources for mitigating ozone pollution: A case study of urban area in the Yangtze River Delta region, China

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 892, P. 164703 - 164703

Published: June 7, 2023

Language: Английский

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Understanding the spatial and seasonal variation of the ground-level ozone in Southeast China with an interpretable machine learning and multi-source remote sensing

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 917, P. 170570 - 170570

Published: Jan. 29, 2024

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Maximizing ozone control by spatial sensitivity-oriented mitigation strategy in the Pearl River Delta Region, China

The Science of The Total Environment, Journal Year: 2023, Volume and Issue: 905, P. 166987 - 166987

Published: Sept. 17, 2023

Language: Английский

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Update of Air Quality Health Index (AQHI) and harmonization of health protection and climate mitigation

Atmospheric Environment, Journal Year: 2024, Volume and Issue: 326, P. 120473 - 120473

Published: March 22, 2024

Language: Английский

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Summertime tropospheric ozone source apportionment study in the Madrid region (Spain)

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(8), P. 4949 - 4972

Published: April 29, 2024

Abstract. The design of emission abatement measures to effectively reduce high ground-level ozone (O3) concentrations in urban areas is very complex. In addition the strongly non-linear chemistry this secondary pollutant, precursors can be released by a variety sources different regions, and locally produced O3 mixed with that transported from regional or continental scales. All these processes depend also on specific meteorological conditions topography study area. Consequently, high-resolution comprehensive modeling tools are needed understand drivers photochemical pollution assess potential local strategies adverse impacts tropospheric levels. study, we apply Integrated Source Apportionment Method (ISAM) implemented Community Multiscale Air Quality (CMAQ v5.3.2) model investigate origin summertime Madrid region (Spain). Consistent previous studies, our results confirm levels dominated non-local contributions, representing around 70 % mean values across region. Nonetheless, emitted sources, mainly road traffic, play more important role during peaks, contributions as 25 ppb. impact higher under unfavorable associated accumulation patterns. These findings suggest system may used future simulate outcomes prevent high-O3 episodes metropolitan

Language: Английский

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Measurement report: Vertical and temporal variability of near-surface ozone production rate and sensitivity in an urban area in Pearl River Delta (PRD) region, China

Published: Jan. 22, 2024

Abstract. Understanding the near-ground vertical and temporal photochemical O3 formation mechanism is important to mitigate pollution. Here, we measured profiles of its precursors at six different heights from 5-335 m using a newly built observation system in Pearl River Delta (PRD) region, China. The net ozone production rate (P(O3)net) sensitivities various were diagnosed an observation-based model coupled with Master Chemical Mechanism (MCM v3.3.1). Moreover, for assessment performance causative factors behind pollution episodes, was 5 ground level utilizing custom-built detection system. In total three episodes two non-episodes captured. identified found be jointly influenced by both physical transport, local reactions play dominate role. high index agreement (IOA) calculated comparing modelled P(O3)net values indicated rationality investigate variability modelling results. However, generally higher than values, particularly under NOx conditions, which may indicate potential underestimation RO2 model. Throughout measurement period, contribution reaction pathways remained consistent across heights, HO2+NO as major pathway, followed RO2+NO. We saw decreased increase height, primarily attributed anthropogenic organic compounds (AVOC) oxygenated volatile (OVOC). regimes similar during non-episodes, located either (VOCs) sensitive regime or transition more VOCs. Diurnally, typically VOCs morning noon time, but transitional afternoon around 16:00 LT. are most AVOC OVOC, suggests that targeting VOCs, especially control measures practical feasible site. analysis mechanisms near surface this study provides critical foundational knowledge formulating effective short-term emergency long-term strategies combat PRD region

Language: Английский

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Characteristics and Formation Mechanism of Ozone Pollution in Demonstration Zone of the Yangtze River Delta, China

Atmosphere, Journal Year: 2024, Volume and Issue: 15(3), P. 382 - 382

Published: March 20, 2024

Emerging research indicates that ground-level ozone (O3) has become a leading contributor to air quality concerns in many Chinese cities, with the Yangtze River Delta (YRD) region facing particular challenges. This study investigated characterization of pollutants Wujiang, which is located within YRD demonstration zone, during warm season (April–September) 2022. The contributions emission and meteorology O3 were identified, O3-NOX-VOC sensitivities discussed, VOC sources their formation analyzed. A random forest model revealed high concentration was mainly caused by combination increased intensity due resumption work production after COVID-19 pandemic, along adverse meteorological conditions. results more than 92% pollution days related season, impact precursor emissions slightly greater VOC-limited regime, reduction strategies targeting VOCs, particularly aromatics such as toluene xylene, have been identified most effective approach for mitigating pollution. Changes sensitivity also observed from regime transitional primarily driven variations NOX concentrations. source analysis showed gasoline vehicle exhaust diesel engine (mobile emissions) significantly those other sources, accounting 20.8% 16.5% total emissions, respectively. highlights crucial role mobile control Furthermore, prioritizing minimal highly recommended regime.

Language: Английский

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National and transboundary contributions to surface ozone concentration across European countries

Communications Earth & Environment, Journal Year: 2024, Volume and Issue: 5(1)

Published: Oct. 14, 2024

Tropospheric ozone impacts health, climate, and ecosystems. Effective mitigation policies are challenged by limited quantitative understanding of national versus transboundary contributions to surface ozone. This study uses a chemical transport model with source apportionment algorithm analyze across Europe from 2015 2017 during peak season. We quantify country-level production imported ozone, distinguishing 35 European countries, neighboring seas, hemispheric influences. Results show substantial outside the playing significant role. crucial high episodes, especially Germany, France, Italy, UK, Poland, Spain. Spain, northern northwest France identified as areas where precursor reductions would be more effective in improving air quality. Furthermore, 25 countries studied net importers cumulative mass, Netherlands, Belgium, UK acting major exporters. These findings highlight need for comprehensive quality cross-border cooperation. The pollutants is critical external contributor concentration Europe, emissions key according an analysis using regional modeling tagging method.

Language: Английский

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Impacts of maritime shipping on air pollution along the US East Coast

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(23), P. 15057 - 15075

Published: Dec. 7, 2023

Abstract. Air pollution is considered a leading threat to human health in the US and worldwide. An important source of air coastal areas globally increasing maritime shipping traffic. In this study, we take high-resolution modeling approach investigate impacts ship emissions on concentrations various atmospheric pollutants, under meteorological conditions year 2018. We utilize Comprehensive Quality Model with extensions (CAMx) simulate transport, diffusion, chemical reactions Weather Research Forecasting (WRF) model provide inputs. focus four criteria pollutants – fine particulate matter diameter smaller than 2.5 µm (PM2.5), nitrogen dioxide (NO2), sulfur (SO2), ozone (O3) as well oxide (NO), calculate their presence absence along East Coast, particularly proximity major ports. find that increase PM2.5 over ocean few inland. The 98th percentile 24 h average (the “design value” used by Environmental Protection Agency) increased up 3.2 µg m−3 some areas. addition, ships contribute significantly SO2 concentrations, 95 % Atlantic 90 land states, which represents ∼45 ppb design values states. hourly NO2 also 15 at ports shore. impact O3 not uniform, meaning affect both positive negative ways: ocean, were higher ships, whereas decreased cities. Our simulation results show emit significant amounts fresh NO atmosphere, then helps scavenge volatile organic compound (VOC)-limited areas, such By contrast, (NOx-limited regime), enhanced NOx due formation therefore enhance concentrations. Overall, dominant southwesterly wind direction region, mainly remain offshore. However, states near ports, are important.

Language: Английский

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