UV radiation reaches us in two
ways: directly and indirectly.
Direct UV radiation travels in a
straight line from the sun.
Indirect UV radiation is reflected or
scattered - it reaches us from any direction and can reach
us even when we’re in the shade.
radiation is usually less intense than direct UV radiation,
but it still contributes to skin and eye damage. The
combination of direct and indirect UV radiation greatly
increases the risk of skin and eye damage.
reflected UV radiation bounces off surfaces
such as walls, pavement, sand, water and snow. In general:
hard surfaces such as paving will
reflect higher levels of UV radiation
than softer surfaces such as grass or soil
smooth surfaces such as metal sheeting
and smooth trowelled concrete reflect higher levels of UV
radiation than coarse or varied surfaces such as timber
cladding, roof tiles or brick paving.
scattered UV radiation is deflected by water droplets in
clouds and other particles in the atmosphere such as dust – it
comes from every direction. Protecting from scattered UV
radiation involves reducing exposure to the sky. If
you can see a lot of blue sky, scattered UV radiation is