Question

what percent of solar radiation is filtered by clouds and may cause sunburn on cloudy days?
3 percent
14 percent
22 percent
31 percent

Explanation:

Clouds filter a certain percentage of solar radiation. It is a known fact in environmental science that about 31 percent of solar radiation is filtered by clouds. This remaining radiation can still cause sunburn on cloudy days as it includes harmful UV rays.

Answer:

31 percent