UV Index Explained: The Hidden Health Risk Rising in India

India and Indian sub continent faces the longer summers and rising temperatures in that an often ignored thing but it is too serious is gaining intensity ultraviolet (UV) radiation. As the people regularly check temperature and air quality but the the UV Index (UVI) remains largely overlooked despite the direct indicator of skin damage risk. Even on the cloudy or cool days UV radiation can remain dangerously high. Technical Experts warn that ignoring the UV Index can lead to long-term health issues and can affect everyday’s life.

What is the UV Index and How is It Measured?

The UV Index (UVI) is a standardized measure which indicates the intensity of ultraviolet radiation which are reaching the Earth’s surface and its potential to cause skin damage or sunburn.

Scientifically it is focuses on ‘erythemally effective UV radiation’ which means the type of UV raysare  most responsible for damaging human skin and mainly UVA and UVB rays.

UV levels are measured using two methods,

• Ground-based instruments like spectroradiometers track real-time UV intensity
• Satellite data and atmospheric models predict UV levels using factors like ozone, cloud cover and solar angle

Who Measures UV Index in India and What Do the Levels Mean?

In India the India Meteorological Department tracks the UV radiation using by the global standards set by international agencies.

The UV Index follows a universal scale,

0-2: Low risk

3-5: Moderate risk

6-7: High risk

8-10: Very high risk

11+: Extreme risk

An important point is that the UV Index measures radiation and it is not temperature.

What Factors Affect Daily UV Levels?

Several environmental and geographical factors can determine how much UV radiation reaches you daily.

• Latitude: The areas closer to the equator (like India) receive stronger UV
• Time of day: UV peaks when the sun is overhead
• Altitude: Higher altitudes have thinner atmospheric protection
• Ozone layer: Lower ozone allows more harmful UVB rays
• Cloud cover: Reduces but does not eliminate UV exposure
• Surface reflection: Water, sand and concrete increase UV intensity

When is UV Radiation Highest in India?

In India UV radiation is typically strongest between 10 AM and 4 PM and especially during month of March to June. This season which marks the pre-summer and peak summer period.

However due to India’s geographic location the moderate to high UV levels persist throughout the year.

Even during winter or monsoon season the exposure remains significant.

Another important factor is that UVA rays can penetrate glass and it means that the indoor exposure near windows can still contribute to skin ageing and damage.

Current UV Levels Across Indian Cities: A Warning Sign

As per the recent data shows that UV levels in many Indian cities are already in the high to extreme category even before the start of the peak summer.

Bengaluru: Around 13 (Extreme)

Chennai: 9-10 (Very High)

Mumbai: 8-9 (High)

Delhi: Around 8 (High)

Hyderabad: 9-10 (High)

Health Risks: More Than Just Sunburn

While sunburn is the most visible effect and the UV radiation causes deeper, long-term damage that often go unnoticed initially.

Key risks include,

• DNA damage and skin cancer risk
• Premature ageing and wrinkles
• Pigmentation issues like melasma
• Weakened immune response
• Eye damage including cataracts

How to Protect Yourself from UV Radiation Daily

Protecting yourself from the UV exposure is requires the consistent and simple habits rather than occasional precautions.

• Use broad-spectrum sunscreen (SPF 30+) daily
• Reapply every 2-3 hours when step in outdoors
• Wear protective clothing, hats, and sunglasses
• Avoid direct sun during peak hours

Daily protection is the most effective way to prevent long-term damage and maintain skin health.

Understanding UVA vs UVB Rays

UV radiation mainly consists of two harmful types.

UVA Rays: Cause ageing, penetrate deeper and pass through glass

UVB Rays: Cause sunburn and play a major role in skin cancer

Both types contribute to cumulative skin damage and making protection essential even indoors or on cloudy days.

Question

Q. What does the UV Index measure?

A) Air pollution levels
B) Temperature
C) Ultraviolet radiation intensity
D) Humidity levels