Kerala has been experiencing high levels of ultraviolet rays this summer.
UV levels above eight, warranting an orange alert, were reported at Konni in Pathanamthitta, Chengannur in Alappuzha, Changanassery in Kottayam and Munnar in Idukki.
UV levels between six and seven, corresponding to a yellow alert, were also recorded at 10 locations across the state.
Prolonged UV exposure can cause sunburn, skin diseases, eye problems and other health issues.
Kerala State Disaster Management Authority (KSDMA) said peak UV levels are usually recorded between 10 am and 3 pm.
People are urged to avoid direct sunlight exposure during these hours.
People involved in outdoor jobs — including fishermen in marine and inland waters, water transport workers, bike riders and tourists — have been advised to take extra precautions.
The warning also applies to individuals with skin conditions, albinism, eye disorders, cancer and weakened immunity.
The authority advised the public to use protective measures such as hats, umbrellas and sunglasses, and to wear full-body cotton clothing while stepping out during the day.
KSDMA also recommends taking breaks in shaded areas during travel and outdoor activities.
UV levels are generally higher in high-altitude and tropical regions and can remain high even on clear, cloudless days. Surfaces such as water bodies and sand can also reflect UV rays, increasing exposure.