Moran et al developed the environmental stress index (ESI) to help evaluate heat stress. The index correlates with wet bulb globe temperature (WBGT) and uses relative humidity and solar radiation. The authors are from the Heller Institute of Medical Research in Tel Hashomer, Israel, and the US Army Research Institute of Environmental Medicine in Natick, Massachusetts.
• The ESI is shown in Figure 3 as ranging from 15 to 35 "units". In later papers (see above) the ESI ranges from 0 to 5. The former value may need to be divided by 10 to get the latter values; however, I do not see this transformation mentioned in the papers.
• The parameters are less cumbersome to measure than wet bulb globe temperature but the index requires a means of measuring solar radiation.
Performance:
• The correlation coefficient with the WBGT is 0.981.
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