Atmospheric Environment, Journal Year: 2024, Volume and Issue: unknown, P. 120823 - 120823
Published: Sept. 1, 2024
Language: Английский
Environmental Pollution, Journal Year: 2023, Volume and Issue: 325, P. 121344 - 121344
Published: March 4, 2023
Language: Английский
Citations
28
npj Climate and Atmospheric Science, Journal Year: 2024, Volume and Issue: 7(1)
Published: July 4, 2024
Abstract Recently, nitrate (NO 3 – ) levels in winter pollution eastern China have been increasing yearly and become the main component of PM 2.5 . The factors contributing to this rise surface NO concentrations remain unclear, complicating development targeted control measures. This study utilizes observational data from Shanghai during 2019, alongside box model simulations, recreate − event identify key growth process. analysis demonstrated that a ozone significantly promotes production by facilitating x conversion via gas-phase heterogeneous reactions. These findings could explain correlation between synchronous increase recent years. Furthermore, simulation strategies for volatile organic compounds (VOCs) identified an approach centered on reduction as notably effective mitigating Yangtze River Delta.
Language: Английский
Citations
6
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 947, P. 174196 - 174196
Published: June 26, 2024
China is currently one of the countries impacted by severe atmospheric ozone (O
Language: Английский
Citations
5
Atmospheric chemistry and physics, Journal Year: 2022, Volume and Issue: 22(22), P. 14799 - 14811
Published: Nov. 22, 2022
Abstract. Ozone (O3) has become a significant air pollutant in China recent years. O3 abatement is challenging due to the nonlinear response of precursors nitrogen oxides (NOx) and volatile organic compounds (VOCs). Photochemical indicators are widely used estimate O3–NOx–VOC sensitivity, this important policy implications. However, effectiveness seldom been evaluated. This study examined applications four that include ratio production rates H2O2 HNO3 (PH2O2/PHNO3), HCHO/NO2, HCHO/NOy, reactive (NOy) Yangtze River Delta (YRD) with localized thresholds. The overall accuracy was high (>92 %) for all not significantly reduced different simulation periods or locations region. By comparing isopleths, it found HCHO/NO2 HCHO/NOy showed most consistency, whereas PH2O2/PHNO3 tended underestimate (overestimate) positive NOx. Additionally, less likely attribute formation mixed sensitivity than other indicators, demonstrated preference single-pollutant control strategy. also revealed details methodology derive threshold values impacted results, may produce uncertainties application photochemical indicators.
Language: Английский
Citations
21
Atmosphere, Journal Year: 2024, Volume and Issue: 15(2), P. 172 - 172
Published: Jan. 29, 2024
This study presents an approach using multiple linear regression to quantify the impact of meteorological parameters and chemical species on aerosol pH variance in urban setting Pearl River Delta, China. Additionally, it assesses contributions interactions among these factors pH. The analysis successfully explains over 96% variance, attributing 85.8% original variables 6.7% bivariate interactions, with further 2.3% 1.0% from trivariate quadrivariate respectively. Our results highlight that factors, particularly temperature humidity, are more influential than components affecting variance. Temperature alone accounts for 37.3% while humidity contributes approximately 20%. On front, sulfate ammonium most significant contributors, adding 14.3% 9.1% In realm interplay between components, especially TNO3–RH pair, is exceptionally impactful, constituting 58.1% total contribution interactions. summary, this illuminates their interplay, suggesting integration statistical methods thermodynamic models enhanced understanding acidity dynamics future.
Language: Английский
Citations
4
The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 918, P. 170374 - 170374
Published: Feb. 2, 2024
Language: Английский
Citations
4
Atmospheric Environment, Journal Year: 2024, Volume and Issue: 334, P. 120712 - 120712
Published: July 24, 2024
Ambient air quality, specifically fine particulate matter (PM2.5) pollution, poses a global health concern due to its associations with adverse effects and persistent presence in urban settings. This study investigates PM2.5 exposure traffic-influenced residential area Vancouver, employing chemical speciation data sampled the vicinity of major road throughout 2018. Using receptor-oriented models, Positive Matrix Factorization (PMF), Principal Component Analysis (PCA), emission sources contributing total mass were identified. The Organic Elemental carbon concentration time series analysis reveals impacts from traffic episodic influences wildfires heating. Applying PMF, we attribute identified factors specific sources: (33%), secondary aerosols (27%), dust (14%), Marine Heavy Fuel Combustion (HFC) (12%), Local (9%), rare metallic elements (5%), respectively. apportioning is subsequently verified by PCA, which introduces sea salt factor analysis. conditional probability function on integrated wind speed direction, PM further confirms partial apportionment marine HFC, elements, local factors. Lastly, comparing results 2015 inventory Vancouver shows similarities share primary while overlooking emissions latter, emphasizing importance field sampling for accurate source characterization. highlights necessity receptor modeling coupled quantifying contribution characteristics sources, particularly near neighborhoods. Precise characterization aids studies that contribute informed quality management policy regulations.
Language: Английский
Citations
4
Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(18), P. 10563 - 10578
Published: Sept. 25, 2023
Abstract. Atmospheric age reflects how long particles have been suspended in the atmosphere, which is closely associated with evolution of air pollutants. Severe regional haze events occur frequently China, influencing quality, human health, and climate. Previous studies explored characteristics mass concentrations compositions fine particulate matter (PM2.5) during events, but atmospheric remains unclear. In this study, age-resolved University California, Davis/California Institute Technology (UCD/CIT) model was developed applied to simulate concentration distribution PM2.5 a severe episode eastern China. The results indicated that North China Plain (NCP) gradually accumulated due stagnant weather conditions beginning stage event. Accordingly, elemental carbon (EC), primary organic aerosol (POA), sulfate (SO42-), secondary (SOA) increased. subsequent growth driven by local chemical formation nitrate (NO3-) under high relative humidity. newly formed NO3- led decrease mean particles. During transport stage, aged from NCP moved downwind Yangtze River Delta (YRD) region, leading sharp increase average EC, POA, SO42-, SOA YRD. contrast, ammonium remained unchanged or even slightly decreased continuous YRD region. Different among these components provides unique perspective on information can also be used for designing effective control strategies different PM2.5.
Language: Английский
Citations
11
Atmospheric chemistry and physics, Journal Year: 2025, Volume and Issue: 25(7), P. 4211 - 4232
Published: April 14, 2025
Abstract. Intensive irrigation is known to alleviate crop water stress and alter regional climate, which can in turn influence air quality, with ramifications for human health food security. However, the interplay between irrigation, climate pollution especially simultaneously intensively irrigated heavily polluted regions China has rarely been studied. Here we incorporated a dynamic scheme into climate–air quality coupled model examine potential impacts of on ozone (O3) fine particulate matter (PM2.5) China. Results show that increases PM2.5 by 12 µg m−3 (28 %) but reduces O3 concentration 3–4 ppb (6 %–8 %). Among PM2.5, nitrate ammonium aerosols rise 70 % 40 %, respectively, upon introducing secondary formation contributing ∼ 60 10 %–30 respectively. High humidity low temperature promote aerosols. To mitigate these adverse effects found 20 reduction NH3 NOx emissions more effective compared individual emission reductions, while enhancement due be completely offset itself. Our study highlights benefits regarding problems under currently prevalent modes anthropogenic scenarios, emphasizing need an integrated approach balance conservation, pollution, change mitigation security face development needs.
Language: Английский
Citations
0
Heliyon, Journal Year: 2025, Volume and Issue: 11(2), P. e41812 - e41812
Published: Jan. 1, 2025
One of the driest countries in world, Iran has been facing several challenges related to water shortage, leading serious social, economic, and environmental impacts. Given escalating urbanization industrial development within Iran, a comprehensive assessment surface quality utilizing both US National Sanitation Foundation Water Quality Index (NSFWQI) for (IRWQIsc) is imperative. This study aimed evaluate Talar River Mazandaran, 2023, through IRWQIsc NSFWQI. was conducted River, located Mazandaran Province Iran. samples from were collected assess 11 physicochemical parameters 10 sampling Points. A total 60 monthly during winter summer 2023. The NSFWQI selected overall River. Nitrate (NO3 -) concentrations ranged 29.32 85.89 mg/L across seasons, with average values falling World Health Organization (WHO) standards. Phosphate (PO4 3-) Chemical Oxygen Demand (COD) levels exceeded WHO limits on occasion, while turbidity electrical conductivity (EC) consistently surpassed Environmental Protection Agency (EPA) guidelines. pH Biochemical (BOD) remained acceptable ranges. indicated generally poor all sites, slight seasonal variations suggesting slightly better conditions indicates that NO3 - PO4 3- meet limits, but COD, turbidity, EC exceed recommended threshold. highlight resulting agricultural pollution. Urgent integrated management essential mitigate these impacts safeguard river health face pressures.
Language: Английский
Citations
0