UV radiation is most intense near the equator and least intense toward the poles. … Latitudes at the equator receive direct sunlight year-round. Latitudes toward the poles receive sunlight at an oblique angle, which means that the same amount of radiation is spread out over a larger area than at the equator.

Why is UV higher closer to the equator?

UV levels are higher closer to the equator. Closer to the equator the sun’s rays have a shorter distance to travel through the atmosphere and therefore less of the harmful UV radiation can be absorbed.

Why is UV higher in Southern Hemisphere?

The southern hemisphere tends to have more UV exposure because of the ozone hole, a seasonal depletion of the ozone layer centered on the South Pole. There are also fewer particles of air pollution — which help block UV — due to the comparatively small numbers of people who live in the southern hemisphere.