Figure 1
From: Spatiotemporal distribution of ground-level ozone in China at a city level
The spatial distribution of the 90th percentile of the maximum daily 8-hour average of the urban O3 concentration in 338 cities in China in 2016 (a), 2017 (b), and 2018 (c). The maps were generated in ArcGIS10.2, URL: http://www.esrichina-bj.cn/softwareproduct/ArcGIS/.
