The preferred apparent temperature calculation method in Canada. Unlike the heat index, which is used in the US,
Humidex (short for “humidity index”) uses dewpoint temperature rather than relative humidity in the calculation
(Masterson and Richardson 1979). The Humidex equation is:

is air temperature (°C)
is dew point temperature (°C).

The number of new cases of a disease or condition in a population within a specific time period. A sudden large
increase in incidence would be classified as an epidemic.

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