Is there a difference between morning and midday ultraviolet rays?

Although ultraviolet rays exist all year round, the sunlight in winter appears milder and foggy in the north, but ultraviolet rays are only about 20% weaker than in summer, and they will still cause great harm to the human body** and eyes, so it is still necessary to avoid ultraviolet radiation in winter. Long-term ultraviolet exposure is most likely to cause ** various pigmentations. So, even in the cold winter, you should wear a barrier or sunscreen when you are outdoors.

It is best not to bask on the beach between 10 a.m. and 4 p.m.; When the UV index is greater than or equal to 10, you should try to avoid going out, because the ultraviolet radiation at this time is extremely harmful.

Of course, especially at two o'clock in the afternoon, when the ultraviolet rays are at their strongest.

There are several reasons why ultraviolet rays may be weaker when the sun is large than on cloudy days:

1.When the angle at which the sun hits the earth's surface is greater, ultraviolet rays are comparatively weaker. Because clouds and atmospheric gases such as water vapor and oxygen absorb and scatter ultraviolet rays, some of them cannot reach the ground.

2.On cloudy days, clouds block the sun's rays, reducing the angle at which the sun hits the Earth, thereby reducing ultraviolet radiation.

It's important to note that although UV rays may be weaker on sunny days than on cloudy days, this doesn't mean that we can ignore sun protection. Because even on cloudy or rainy days, the ultraviolet rays in the sun can still penetrate clouds or haze and cause damage to the human body. Therefore, it is prudent to take precautions against the sun in any weather.

Ultraviolet rays on cloudy days.

Very strong, clouds have almost no isolation effect on UVA UVA, all UVA UVA rays can penetrate clouds, that is to say, 90 ultraviolet rays can penetrate clouds, only posture and dim and heavy rain clouds can prevent some of the UVA.

It's not that it's stronger than a sunny day, but there are also strong ultraviolet traces on cloudy days, and everyone has no sense of protection, so it's easy to ignore it, causing bad consequences.

Strong ultraviolet rays on sunny days.

Cloudy. Although the ultraviolet rays are not stronger than those on sunny days, there will be strong ultraviolet rays on cloudy days, and once you neglect sunscreen work, you will also be tanned. Ultraviolet light refers to the light with a wavelength of 100 to 400 nanometers in the sun, which is mainly divided into UVA, UVB, UVC.

All UVA ultraviolet rays can penetrate the clouds, that is to say, 90% of the ultraviolet rays will penetrate the clouds on cloudy days, shining on our **, usually only the dim and thick cloud and rain layer can block part of the ultraviolet rays, reduce the sun protection value, so in the cloudy.

Or on a cloudy day, the UV rays are not much weaker, and only 20% weaker than on a sunny day.

Daily sun protection precautions.

1. Avoid the most intense ultraviolet rays.

Even if you use sunscreen products, you can't 100% prevent the damage caused by ultraviolet rays, so when you go out, you should avoid the most intense ultraviolet rays, such as 10 a.m. to 4 p.m.

Also pay attention to the shelf life of sunscreen products.

Although the shelf life of sunscreen products is generally 3 to 5 years, the shelf life will be shortened after opening, generally half a year to one year.

2. Pay attention to recoating.

Whether you're using a chemical sunscreen or a physical sunscreen.

It is necessary to pay attention to reapplying, especially after a lot of exercise, such as hiking, chemical sunscreen should be reapplied every 2 to 3 hours, physical sunscreen should be reapplied every 3 4 hours, and sunscreen should be applied even indoors.

Generally not strong. In summer, the sun's ultraviolet rays are not strong between 6 a.m. and 9 a.m., and they don't get sunburned. In summer, the period from 10 a.m. to 2 p.m. is the time when the sun is strongest and the ultraviolet rays are the most powerful throughout the day, which is the most harmful to the skin, so you should pay attention to sun protection measures.

Is the ultraviolet light strong in the morning?

The UV index is generally divided into 5 grades, of which the 1st shaded UV exposure intensity is the weakest, while the 5th UV exposure intensity is the strongest.

When you go out, you can protect yourself by wearing a hat, sunglasses, sunscreen shirt, and sun umbrella**.

When using sunscreen, it is recommended to wipe it every 2-3 hours.

1. There are ultraviolet rays at night. At night, there are still residual ultraviolet rays left in the atmosphere, and before 10 p.m. and after 2 a.m., because of the refraction of sunlight by the atmosphere, trace amounts of ultraviolet rays continue to be scattered in the air at night.

2. The moonlight at night is very weak, and the corresponding energy and ultraviolet intensity are also very weak, and secondly, the moonlight does not have heat, so it will not be like the daytime sunlight, which will make the sunburn red, sunburn, and the weak ultraviolet rays in the moonlight will not make the secretion of melanin, so you don't have to worry about the impact on you.