Figure 3.

The Paris Index of Heatstroke Related Excess Mortality. The three annual periods were superimposed and synchronised weekly. The vertical dashed lines define the heat-wave period (3–19 August 2003). The alert threshold was defined as the maximum value of the Paris Index of Heatstroke Related Excess Mortality (PIHREM) outside the heat-wave period (horizontal red line). (a) Indicator calculated using the whole data (2001, blue curve; 2002, green curve; 2003, red curve) (b) The PIHREM (red curve) and Paris mortality (black curve).