According to the High Pressure Gas Safety Institute of Japan (KHK), the number of high pressure gas accident occurred in 2011 came to 999, up by 61 over the previous year. Of these, the number of accidents due to natural disaster marked highest ever, increasing by 58 over 2010. Number of lost and theft has been increasing year by year.

The number of accident related to the Great East Japan Earthquake came to 94, of these accidents due to natural disaster came to 86, and lost and theft came to 8. Most of these accidents occurred at factories. Looking at number of accidents according to what kind of accidents, the most accidents was belch or leaking, coming to 70 followed by explosion and destroy coming to 13.