City UV Index Checker

City UV Index Checker: Core Features and Principles

Not sure how to properly protect yourself from the sun during outdoor activities? This tool provides real-time Ultraviolet Index (UVI) lookups for over 300 prefecture-level cities nationwide. The UVI is an internationally recognized, dimensionless scale (ranging from 0 to 11+) that measures the potential for skin damage from solar UV radiation. Based on actual meteorological station data and updated hourly, it returns the day's peak UVI value, risk level (Low/Moderate/High/Very High/Extreme), and corresponding sun protection advice.

Why Choose Our City UV Index Checker?

• Authoritative Data: Uses on-the-hour observation data from weather stations, not model estimates.
• Intuitive Results: Visually displays UVI values, risk level icons, and specific protective measures.
• Timely Updates: Automatically fetches the latest data every hour with a delay of no more than 30 minutes.

How to Use

1. Enter the Chinese city name in the search box (supports full names and common abbreviations).
2. Click "Search" or press Enter.
3. View the UVI value, risk level, and sun protection advice in the results card.

Frequently Asked Questions (FAQ)

• Q: Do I need sun protection on cloudy days? A: Yes. Up to 80% of UV rays can penetrate through clouds even on overcast days.
• Q: Why is the UVI so high in high-altitude areas? A: For every 1,000 meters increase in altitude, UV levels increase by about 10-12%. Combined with thinner air and a thinner ozone layer, UV intensity in high-altitude regions is significantly higher than in plains.

Important Notes

Please use standard Chinese names when entering cities. UVI levels are consistently high in high-altitude, island, and snow-covered regions. Children's skin is more sensitive; it is recommended to start basic sun protection when the UVI is ≥3.

Technical Notes & Usage Tips

Typical query example: Searching for "Lhasa" at noon in summer usually returns a UVI of 12.6 (Extreme level). It is advised to avoid going out at noon, use SPF 50+ sunscreen, and reapply every 2 hours. Note that UVI peaks between 11:00 AM and 2:00 PM, during which time sun protection should be reinforced.