Fig 1. Summer and fall average UVB exposure.
Average UVB radiation during noontime sun exposure for 14 days in the summer and fall at close to the summer solstice and fall equinox, respectively. Data were recorded every second for the one hour exposure period around solar noon (± 30 minutes). Each point represents the mean of the 3600 points. Error, expressed as 95% confidence intervals about the mean are not visible (range = 6.2 X 10−5 to 0.033731). Days with low UVB radiation were cloudy during the sun exposure period.