Work

Changes in the urban dew chemical composition in Northeast China from 2013 to 2023

Year: 2024

Type: article

Abstract: The chemical composition of dew is closely related to the air quality . Since 2013, China has promulgated a series of laws and regulations focused on air pollution control , and remarkable results have been achieved over the past decade. As an indicator of near-surface air quality , the chemical composition of dew obviously changes. The dew quality was affected mainly by the local air quality. The mean dew pH was 6.3 ± 0.4 ( n = 186) from 2013 to 2023, and the order of ions was SO 4 2− (3180.7 ± 3592.0 µeq/L) > NH 4 + (2552.3 ± 2971.8 µeq/L) > Ca 2+ (1006.2 ± 945.5 µeq/L) > NO 3 − (397.2 ± 511.0 µeq/L) > Cl − (152.3 ± 133.4 µeq/L) > K + (149.4 ± 191.6 µeq/L) > F − (133.0 ± 110.3 µeq/L) > Na + (123.8 ± 94.9 µeq/L) > Mg 2+ (83.3 ± 65.6 µeq/L). The dew quality deteriorated on hazy days. There were no haze events during the condensation period after 2020, which caused a significant reduction in the concentration of the main ions in the dew. Over the past decade, electrical conductivity (EC), total dissolved solids (TDS), PM 2.5 and PM 10 , as well as major ions (SO 4 2− , NO 3 − , NH 4 + , Ca 2+ , Cl − , Na + , F − , K + and Mg 2+ ) in dew, have all tended to decrease. The annual mean NO 3 − concentration in 2023 was 86.5 % lower than that in 2013, with values of 79.3 % for SO 4 2− , 77.3 % for Ca 2+ , 76.7 % for NH 4 + , 74.6 % for K + , 65.4 % for Mg 2+ , 63.4 % for Na + , 61.7 % for Cl − , and 60.3 % for F − .

Source: Journal of Environmental Sciences

DOI: 10.1016/j.jes.2024.12.013

Authors: Yingying Xu, Haodong Hou, Yachao Zhang, Yunze Zhao, Xiaoteng Liu

Institution: Jilin Jianzhu University

Language: English

Topic: Atmospheric chemistry and aerosols

Subfield: Atmospheric Science

Field: Earth and Planetary Sciences

Domain: Physical Sciences

SDGs: Clean water and sanitation, Climate action

Open Access status: hybrid

Estimated APC paid: $3,000