Smog from China is now drifting over parts of Japan, triggering health warnings for the young and sick.
Japanese media has been saturated with coverage of the thick, choking smog blanketing Beijing and other Chinese cities in recent days.
News programs have also broadcast maps showing the pollution being pushed west by the winds towards southern Japan.
Japanese health experts are warning that people with respiratory problems and small children are susceptible to the smog, which is worst on the southern island of Kyushu.
The website of Japan's environment minister has been choked with users logging on to monitor the level of pollution heading their way.