The Centers for Disease Control and Prevention has issued a report on the Occupational Safety and Health Administration's review of 20 heat-related enforcement cases from 2012 to 2013. OSHA's analysis suggests that the primary risk factor for heat fatalities is the lack of acclimatization programs.

Of the 13 enforcement cases involving worker fatalities, nine of the deaths occurred in the first three days of working on the job, while four of them occurred on the worker's first day. In all cases, heat illness prevention programs were found to be incomplete or absent and no provision was made for acclimatizing new workers to the heat.

Read entire article: https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=NEWS_RELEASES&p_id=26502