Spatiotemporal variations, sources, and atmospheric transformation potential of volatile organic compounds in an industrial zone based on high-resolution measurements in three plants

The Science of The Total Environment, Год журнала: 2024, Номер 923, С. 171352 - 171352

Опубликована: Март 2, 2024

Язык: Английский

---

Characteristics and sources of nonmethane volatile organic compounds (NMVOCs) and O₃–NO_x–NMVOC relationships in Zhengzhou, China

Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(15), С. 8549 - 8567

Опубликована: Авг. 1, 2024

Abstract. Nonmethane volatile organic compounds (NMVOCs) are important precursors of ozone (O3) formation under sufficient nitrogen oxide conditions. Understanding the characteristics and emission sources NMVOCs, as well relationship between NMVOCs O3, is great significance for effective O3 pollution control. In this study, continuous online monitoring was carried out in Zhengzhou, Henan, from 1–30 June. Furthermore, study provided recommendations strategies aimed at reducing formation. During observation period, concentration total (TNMVOCs) varied 9.9 to 60.3 ppbv, with an average 22.8 ± 8.3 ppbv. The TNMVOCs during events higher than on clean days. Six major were identified using positive-matrix-factorization model. Vehicular exhausts (28 %), solvent usage (27 industrial production (22 %) main sources. We explore O3–precursors propose observation-oriented control strategies. results relative incremental reactivity (RIR) Empirical Kinetics Modeling Approach show that Zhengzhou anthropogenic compound (AVOC)-limited regime. had largest RIR value, while NOx exhibited a negative value. It noteworthy sensitivity biogenic (BVOCs) greater AVOCs. Considering reduction effect, it recommended ratio AVOCs be maintained no less 3:1 effectively reduce

Язык: Английский

---

Spatiotemporal Dynamics of COVID‐19 Pandemic City Lockdown: Insights From Nighttime Light Remote Sensing

GeoHealth, Год журнала: 2024, Номер 8(6)

Опубликована: Июнь 1, 2024

Abstract The global COVID‐19 outbreak severely hampered the growth of economy, prompting implementation strictest prevention policies in China. Establishing a significant relationship between changes nighttime light and lockdowns from geospatial perspective is essential. In remote sensing, we evaluated spatiotemporal dynamic effects city on human activity intensity Zhengzhou region. Prior to outbreak, region maintained trend, even under regular control measures. However, following October 2022 lockdown, experienced substantial decrease. central area Zhengzhou, decreased by at least 18% compared pre‐lockdown levels, while sub‐center, decrease was around 14%. areas where most were primarily within 15 km radius, concentrated 5 radius. These both statistical data underscored impact lockdown economic activities

Язык: Английский

---

Site selection and effects of background towers on urban CO2 estimates: A case study from central downtown Zhengzhou in China

Environmental Research, Год журнала: 2024, Номер 263, С. 120169 - 120169

Опубликована: Окт. 16, 2024

Язык: Английский

---