Supplement of
Understanding regional background ozone by multiple methods: A case
study in the Shandong region, China, 2018-2020
*Correspondence:
lily@shu.edu.cn (Li Li).
Figures S1 Time series of the amplitude of four principal
components by Method 1, temperature, relative humidity, and wind speed
in the SD region from 2018 to 2020.
Figures S2 Scatter plot of the four principal components
against temperature by Method 1.
Figures S3 Scatter plot of the four principal components
against wind speed by Method 1.
Figures S4 Example of Weihai where O3,
NO2 and WS explain the variation in PC1 amplitude.
Figures S5 Example of Weihai where O3,
NO2 and WS explain the variation in PC2 amplitude.
Table S1 The loadings associated with each principal component
using Method 1.