The thin layer of ozone that surrounds Earth acts as a shield, protecting the planet from irradiation by UV light. The amount of ozone required to shield Earth from biologically lethal UV radiation, wavelengths from 200 to 300 nanometers (nm), is believed to have been in existence 600 million years ago.

ozone

According to Scripps Atmospheric Scientist Ray Weiss the answer is no, even though it feels that way. He says it’s not that the sun is stronger, but rather the ozone layer is thinner meaning more UV rays are coming through.

Effective shade can provide protection from the Sun’s UV rays, but we can still get burnt in the shade. The Sun’s rays reflect from light-coloured surfaces and can bounce back under shade. Light surfaces, such as concrete, light-coloured paint or metallic surfaces, reflect more than dark ones.

It is entirely possible. You don’t actually have to be directly under sunlight to tan, so you can tan while sitting under your beach umbrella in the shade. The sun reflecting off of objects in your environment is primarily why you can tan in the shade, although there are other reasons too.

The reason most conventional glass prevents you from getting a tan is because UV rays can’t penetrate it. UV rays are portions of sunlight that trigger our skin to produce melanin, the dark pigment that protects us from burning and that creates a tan.

Sunscreen protects the skin from the harmful ultraviolet radiation from the sun – prolonging the time a person can spend outside without getting burnt. The higher the SPF, the more protection a sunscreen offers – with SPF 50 filtering 98 per cent of UV rays. You can, however, tan while wearing sunscreen.

Yes, if you are wearing sheer or light-colored clothes, especially wet clothes, and the sun is strong that day, you can get sunburnt through clothes. If you care about this, look for clothes that have been tested and have a UPF rating.

Wear protective clothing, sunglasses with UV protection and take other accessories like sun hats and parasols when you are out in sun heat. cover your face, hands, and legs when exposed to the sun. If you regularly spend time exposed to sun or swim, you need to apply protection creams every 20 minutes.

If you are outside on a hot and sunny day and are wearing clothing as you said, thick black jeans, you can still get sunburnt. Clothing does block the suns ultraviolet radiation, but not 100%.