Figure 2
From: Recent intensification of winter haze in China linked to foreign emissions and meteorology
Linear trends (μg m−3 decade−1) of (a) the model simulated and (b) normalized DJF mean PM2.5 concentrations over the North China Plain contributed by the North China Plain, rest of China and foreign emissions for the three time periods, and (c,d) decomposed foreign contributions by tagged source regions. Black lines on the bars represent 95% confidence intervals of the linear regression. Source regions include the North China Plain (NTC), Southern China (STC), Southwestern China (SWC), Central-Western China (CWC), Northeastern China (NEC), Himalayas and Tibetan Plateau (HTP), rest of East Asia (REA), South Asia (SAS), Southeast Asia (SEA), Russia/Belarus/Ukraine (RBU), Europe (EUR), the Middle East (MDE), Central Asia (CAS) and rest of the World (ROW).
