'Cause for concern': No heatwave yet but UV radiation already a worry in Bengaluru, Kerala; what you need to know

BENGALURU: Even before the peak summer months set in, parts of south India are witnessing an unusual rise in ultraviolet (UV) radiation levels.

In Bengaluru, a relatively moderate maximum temperature of 32°C recorded on Tuesday was accompanied by a sharp spike in UV radiation.


The city’s afternoon UV Index climbed to 13 — classified as “extreme” under World Health Organization (WHO) standards.

Weather officials said the sudden surge in UV levels, rather than the temperature itself, was the more worrying development.

The rapid jump in UV levels — from 10 to 13 in under two days — has raised concern among experts.

UV intensity is influenced largely by the thickness of the ozone layer, which acts as a protective shield by absorbing much of the Sun’s harmful radiation.

Radiation alert in Kerala

Authorities in Kerala have also flagged similar concerns.

The Kerala State Disaster Management Authority (KSDMA) issued an ultraviolet radiation alert after several districts recorded high UV Index values.

Konni, Chengannur and Munnar recorded a high UVI of 8, while Kottarakkara, Changanassery, Ollur, Thrithala and Mananthavady recorded UVI levels of 7. Earlier, the authority noted that districts including Kollam, Pathanamthitta, Alappuzha, Kozhikode and Palakkad had recorded a UV index of seven, while Idukki touched eight.

KSDMA warned that continuous exposure to UV radiation for long periods can lead to sunburn, skin diseases, eye problems and other health issues.

The highest UV radiation levels are typically recorded between 10am and 3pm.

Precautions to take during high UV radiation:

• Avoid direct sunlight between 11am and 3pm, when UV radiation is at its strongest.
• Wear sunscreen with SPF 30 or higher and reapply every 2–3 hours if outdoors.
• Use protective clothing such as full-sleeve shirts, caps or wide-brimmed hats.
• Wear UV-protection sunglasses to prevent eye damage.
• Stay well hydrated by drinking plenty of water and fluids.
• Seek shade whenever possible, especially during peak afternoon hours.
• Avoid prolonged outdoor work or exercise during extreme UV conditions.
• Watch for signs of sunburn, dizziness, dehydration or heat exhaustion and seek rest immediately.

Risks of high UV radiation exposure:

• Sunburn and skin irritation after even short periods in direct sunlight
• Premature skin ageing, including wrinkles and pigmentation
• Eye damage, such as irritation and long-term vision problems
• Increased risk of skin cancer with prolonged or repeated exposure
• Dehydration due to intense heat and sun exposure
• Heat exhaustion, especially during extended outdoor activity
• Heatstroke in severe cases, particularly among outdoor workers and vulnerable groups