A new report, authored by NFPA's John R. Hall, Jr. has just been published. This report, "Deaths and Injuries Due to Non-Fire Exposure to Gases," includes statistics from the U.S. death certificate database and the CPSC database on injuries reported to hospital emergency rooms on fatal and non-fatal injuries involving exposure to gases.
In 2008, 756 people died of unintentional injuries due to non-fire exposure to gases. Anoxia, which is injury involving oxygen deprivation, accounted for 41,200 injuries reported to hospital emergency rooms in 2010, including 20,000 with no fire involvement.
The full report can be downloaded for free, as with all Research Foundation reports.