Ozone Weekend Effect in Cities: Deep Insights for Urban Air Pollution Control

Overview

Journal Environ Res

Publisher Elsevier

Specialty Environmental Health

Date 2020 Sep 13

PMID 32919964

Citations 18

Authors

Pierre Sicard

Elena Paoletti

Evgenios Agathokleous

Valda Araminiene

Chiara Proietti

Fatimatou Coulibaly

Alessandra De Marco

Affiliations

Soon will be listed here.

Abstract

Studying weekend-weekday variation in ground-level ozone (O) allows one to better understand O formation conditions, with a potential for developing effective strategies for O control. Reducing inappropriately the O precursors emissions can either produce no reduction or increase surface O concentrations. This paper analyzes the weekend-weekday differences of O at 300 rural and 808 urban background stations worldwide from 2005 to 2014, in order to investigate the O weekend effect over time and assess the effectiveness of the precursors emissions control policies for reducing O levels. Data were analyzed with the non-parametric Mann-Kendall test and Theil-Sen estimator. Rural sites typically did not experience a weekend-weekday effect. In all urban stations, the mean O concentration on the weekend was 12% higher than on weekdays. Between 2005 and 2014, the annual mean of daily O concentrations increased at 74% of urban sites worldwide (+ 0.41 ppb year) and decreased in the United Kingdom (- 0.18 ppb year). Over this time period, emissions of O precursors declined significantly. However, a greater decline in nitrogen oxides (NO) emissions caused an increase in Volatile Organic Compounds (VOCs) to NO ratios leading to O formation. In France, South Korea and the United Kingdom, most urban stations showed a significant upward trend (+ 1.15% per year) for O weekend effect. Conversely, in Canada, Germany, Japan, Italy and the United States, the O weekend effect showed a significant downward trend (- 0.26% per year). Further or inappropriate control of anthropogenic emissions in Canada, Southern Europe, Japan, South Korea and the United States might result in increased daily O levels in urban areas.

Citing Articles

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