Figures & data
Figure 1. Mean critical environmental limits (with SD) for elevations in heart rate with fan use measured at 36°C and 42°C (solid circles). The dashed line represents the environmental limits for fan use proposed by the World Health Organization (WHO) and the Center for Disease Control and Prevention (CDC). Numbered circles identify the peak environmental conditions during some of the most severe recent heat waves; Karachi, Pakistan 2015 (1); New Delhi, India 2007 (2); Dhahran, Saudi Arabia 2003 (3); Paris, France 2003 (4); Chicago, USA 1999 (5); Frederick, USA 2010 (6); Washington, USA 2012 (7).
