Appearance of Highly Concentrated Ozone in and around Tokyo Metropolitan Area on August 4, 2006.

Abstract

On August 4, 2006, an official photochemical smog alert was issued to five prefectures in the Tokyo metropolitan area and further to Fukushima Prefecture. The highest O₃ level that day was 157 ppb, which was recorded in Ibaraki Prefecture and Saitama Prefecture. The highest value was recorded in Gunma Prefecture at 17:00, suggesting possible of advection of the pollution. In addition, analysis of mean-sea-level barometric pressures revealed that, heat lows occurred in Nagano Prefecture and Fukushima Prefecture. Furthermore, heat lows were typical central Japan on clear summer days.