PAH emission reduction percentages of regions and provinces under future climate change. The PAH emission reduction targets of reducing the median multi-pathway exposure cumulative overall ILCR values to be at a safe level (less than 1.00 × 10⁻⁶) compared with the emission in the base year when the temperature rises to 4°C under the RCP8.5 scenario for (A) four geographical regions (including North China, South China, Northwest China, and the Qingzang Gaoyuan), and (B) 30 provinces (excluding Hong Kong, Macao, Hainan, and Taiwan) of China. Data from Hainan and Taiwan are unavailable so that Hainan and Taiwan are uncolored in all the maps.