Eight districts of the continent and the island of Madeira, presents an extreme risk of exposure to ultraviolet (UV) radiation, according to the Portuguese Institute of the Sea and Atmosphere (IPMA).
At extreme risk are today the districts of Guarda, Castelo Branco, Santarém, Portalegre, Lisbon, Évora, Setúbal and Beja and the island of Madeira.
The IPMA recommends in case of extreme risk that the population avoid the sun exposure as much as possible.
For regions with very high and high risk, the IPMA recommends the use of sunglasses with UV filter, hat, t-shirt, parasol, sunscreen and to prevent children from sun exposure.
The ultraviolet index ranges from 1 to 2, where the risk of exposure to UV radiation is low, 3 to 5 (moderate), 6 to 7 (high), 8 to 10 (very high), and greater than 11 (extreme).
Taken from Diario Noticias
The calculation is based on the observed values at 1:00 p.m. each day relative to the air temperature, relative humidity, wind speed and amount of precipitation in the last 24 hours.