Extended Data Fig. 1: Correlation between daily meteorology anomalies and winter PM2.5.
From: Winter particulate pollution severity in North China driven by atmospheric teleconnections
a, Topographic map of the North China Plain (shading, unit: m) and locations of cities (black dots) with observed PM2.5 concentrations used in this study. b-m, Distribution of correlation coefficients between daily mean PM2.5 concentrations and daily meteorological fields during DJFs from 2013 to 2019. Stippled regions in b-m denote those areas exceeding the 95% significance level based on the Student’s t-test. The blue line is the boundary of the BTH region.
