Types of UV
The ultraviolet radiation is
classified into:
· UVA: are arriving in
greater numbers to the earth's surface. In excess are harmful to health.
· UVB: they are more
harmful than the previous ones. Mostly they are absorbed by the ozone layer,
but the deterioration of the same is increasingly allowing their passage.
· UVC: these are the
most harmful and do not reach the earth's surface.
The incidence of the
rays of the sun on Earth, and hence its harmful effects also depend on
factors such as altitude, latitude, time of day and the area in which they
reflect the sun.
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