Foreccast > UV Index


MENU 12/ 19 UV index
Stage Explanation and notes

Dangerous
(11 or higher)
Exposure to the sun is extremely risky and exposed skin may burn within minutes. Wear outer garments, a hat and sunglasses and reapply plenty of UV ray blocker every 2 hours.

Very high
(8-10)
Exposure to the sun is very risky and exposed skin may burn quickly. Wear outer garments, a hat and sunglasses and apply UV ray blocker.

High
(6-7)
Exposure to the sun is risky and you need protection when exposed to sunlight. Wear outer garments, a hat and sunglasses and apply UV ray blocker.

Average
(3-5)
Exposure to the sun is moderately risky. Wear outer garments and apply UV ray blocker when exposed to sunlight.

Low
(2 or less)
The risk of UV radiation is low for most people.
MENU UV index explanation
The ozone in the stratosphere about 13-50 km from the surface of the earth is a thin protective layer to protect living things on the earth from harmful UV rays from the sun. However, scientists in the 1980s proved that this stratospheric ozone was being reduced. Ozone reduction means more harmful UV rays (UV-B) reaching the earth's surface, and people exposed to lots of UV rays are at risk of health problems such as skin cancer, cataracts, and reduced immunity.

Since stratospheric ozone and clouds have a great influence on the strength of UV rays reaching the earth, the National Weather Service developed the "ultraviolet index" to show changes in weather and amount of stratospheric ozone and uses this to prepare for predicted risks due to excessive exposure to the sun.
The ultraviolet index calculates UV ray (UV-B) radiation reaching the earth's surface during the culmination time when the sun is at its highest. This is divided into ten categories with 0 meaning risk during exposure is very low and 9 or higher meaning very high risk during excessive exposure. The National Weather Service has announced the daily index at 06:00 and the next day's index at 18:00 since June 1st, 1998 to recommend protection from UV rays for citizens and aims to minimize national health problems related to UV rays, including skin cancer and cataracts.
MENU UV ray strength and average time to sunburn
Over 9.0 UV rays are very strong. Exposed skin burns in about 20 minutes.
7.0~8.9 UV rays are strong. Exposed skin burns in about 30 minutes.
5.0~6.9 UV rays are of average strength. Exposed skin burns in about 1 hour.
3.0~4.9 UV rays are weak. Exposed skin burns in about 100 minutes.
0.0~2.9 UV rays are very weak. Exposed skin burns in about 2-3 hours.
MENU Time to sunburn according to UV index
   
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