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The crown pandemic virus COVID-19 that it attacked has made some Indonesian people like to bask in the sun. Sunbathing is believed to increase the body’s immunity to prevent COVID-19 infection.
But it seems that sunbathing cannot be done at random. Someone needs to know the right time to sunbathe so that exposure to UV ultraviolet rays does not harm human skin.
Summing up from the official website of the Agency for Meteorology and Geophysics (BMKG), Monday (04/13/2020), in general, the band of light waves is divided into three parts. The first is ultraviolet light with a wavelength of 100-400 nm.
The second is the light that the human eye can see at 400-700 nm. While the third is infrared (IR) with a wavelength of 700 nm to 1 mm. IR rays have characteristics similar to UV rays that the eye cannot capture.
UV rays are part of the electromagnetic waves from the energy of solar radiation that reaches the Earth’s surface. The World Meteorological Agency (WMO) said that less sunlight will affect mood and cause vitamin D deficiency.
But if you get too much sun exposure, it will pose a danger to human health. Therefore, people are advised not to neglect when sunbathing.
UV rays in the 100-400nm wave fall into three categories. That is, UV A, specifically 316-400 nm, UV B with 280-325 nm and UV C 100-280 nm. Upon entering the atmosphere, almost all UV C rays will be retained in the ozone layer.
While 90 percent of UV B rays will be absorbed by ozone, water vapor, and other gases in the atmosphere. While UV A can mainly reach the surface of the earth. Therefore, the total sunlight reaching Earth is UV A (90-99%) with a small amount of UV B (the UV Index describes the level of UV radiation exposure that will be related to human health. This UV Index can help humans control the level of good UV light for both the body and those that are harmful to humans.
The UV index is divided into 11 levels that can be seen from the color change. The United States Environmental Protection Agency (EPA) explains the five indicators of the UV index.
UV Index 1-2 (low), marked in green: no protection required. A person can stay safe outside the house and get the minimum sunlight.
UV Index 3-5 (moderate), marked in yellow: protection required. Seek shade from morning to afternoon.
UV Index 6-7 (high), marked in orange: When outside, you should apply sunscreen on exposed skin. Also wear protective clothing, wide-brimmed hats, and sunglasses.
UV Index 8-10 (Very High), marked in red – additional protection is required. Be careful if you are outside the house.
UV Index 11 and above (extreme), marked in purple: If the shade is shorter than yours, find a shady spot and wear protective clothing such as a wide hat and sunglasses. Also apply sunscreen on exposed skin.
The Indonesian UV Index on Monday (04/13/2020) can be seen through the table below:
https://www.bmkg.go.id/cuaca/indeks-uv.bmkg
https://www.epa.gov/sunsafety/uv-index-scale-0
(hel)
