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Updated: May 31, 2026
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Façade-Level Monitoring of CO2 Variability under Urban Heat Island Conditions using Low-Cost Sensor Data Loggers
Published on: December 12, 2025
[Comparison of ozone between Beijing and downstream area]
Zhi-Qiang Ma1, Yue-Si Wang, Xiao-Ling Zhang
1Institute of Urban Meteorology, China Meteorological Administration, Beijing 100089, China. zqma@ium.cn
Huan Jing Ke Xue= Huanjing Kexue
|July 2, 2011
Summary
Ozone levels and meteorological factors were studied around Beijing. Rural ozone peaks lagged urban peaks, and stagnant conditions caused ozone accumulation, potentially impacting crops.
Area of Science:
- Atmospheric Chemistry
- Environmental Science
- Meteorology
Background:
- Ozone (O3) pollution is a significant environmental concern, particularly in urban and downwind areas.
- Understanding the diurnal and seasonal variations of ozone is crucial for assessing its impact on human health and ecosystems.
Purpose of the Study:
- To investigate ozone concentrations and meteorological factors at urban and rural sites near Beijing.
- To analyze the spatial and temporal differences in ozone variability and exceedance events.
- To assess the potential impact of ozone on agricultural yields.
Main Methods:
- Continuous monitoring of ozone and meteorological parameters at an urban station (Beijing) and a downwind rural station (Xinglong) from June 2005 to September 2006.
- Analysis of diurnal and seasonal ozone variations, peak concentrations, and exceedance hours relative to China's norm.
- Investigation of the influence of air mass transport, stagnant conditions, and mountain-valley breezes on ozone distribution.
Main Results:
- Urban ozone exhibited stronger diurnal and seasonal variations compared to rural ozone.
- Ozone exceedance hours were 171 in Beijing and 255 in Xinglong, with Beijing's exceedances occurring mainly before 16:00 and Xinglong's predominantly at night.
- Ozone peak concentrations at Xinglong lagged behind Beijing due to Beijing's air mass influence, and double ozone peaks were observed at Xinglong, linked to mountain-valley breezes.
- Stagnant conditions and mountain-valley breezes contributed to ozone accumulation in downwind areas.
- AOT40 values at Xinglong indicated a potential for over 30% loss in wheat yields.
Conclusions:
- Air mass transport from urban to rural areas significantly influences downwind ozone concentrations and timing.
- Local meteorological phenomena, such as stagnant conditions and mountain-valley breezes, play a critical role in ozone accumulation in downwind regions.
- Elevated ozone levels and AOT40 values pose a substantial risk to agricultural productivity in the studied region.
