The Chinese are actually blaming the Japan for high PM2.5 levels.
“Now comes a new spat, with Japanese officials and media suggesting China’s latest air-pollution crisis may be spreading across the East China Sea into Japan… The Japanese reports drew some harsh response from China. One critic was quoted as saying: ‘After the earthquake, Japan switched from nuclear power to coal fired power, and has been incinerating their waste. This has greatly affected China’s environment, so one cannot criticize only China. The pollution needs to be reduced, but we cannot ignore climate change and neighboring countries’.”