Does UV Rays Light Pass Through The Car Windsheild Glass,Side Glass And Rear Glass Windows
Car Windows Won't Protect You From UV Rays
Car windshields generally block almost all UVB and most UVA rays due to their laminated construction, but side and rear windows often allow significant UVA penetration. While laminated windshields offer high protection (roughly 95−98% UVA reduction), side windows made of tempered glass may only block a small percentage of UV rays.
Key Details on UV Penetration:
- Windshields (Laminated): These typically block 94% of UVA and almost 100% of UVB rays.
- Side/Rear Windows (Tempered): These offer less protection, with studies showing 25% to 56% of UVA radiation can pass through them.
- Health Risk: Due to UV penetration, particularly from side windows, drivers are at risk of skin damage and long-term sun exposure effects.
- Protection Solutions: Applying aftermarket UV-protective films to side windows can significantly reduce, or almost eliminate, UVA penetration.
Structure of UV Rays:
Ultraviolet (UV) radiation covers the wavelength range of 100–400 nm, which is a higher frequency and lower wavelength than visible light. UV radiation comes naturally from the sun, but it can also be created by artificial sources used in industry, commerce and recreation.
The UV region covers the wavelength range 100-400 nm and is divided into three bands:
- UVA (315-400 nm)
- UVB (280-315 nm)
- UVC (100-280 nm).
As sunlight passes through the atmosphere, all UVC and approximately 90% of UVB radiation is absorbed by ozone, water vapour, oxygen and carbon dioxide. UVA radiation is less affected by the atmosphere. Therefore, the UV radiation reaching the Earth’s surface is largely composed of UVA with a small UVB component.
The amount of UV radiation from the sun that hits the Earth’s surface depends on several factors, including the sun’s height in the sky, latitude, cloud cover, altitude, the thickness of the ozone layer and ground reflection. Reductions in the ozone layer due to human-created pollution increase the amount of UVA and UVB that reaches the surface. This can impact human health, animals, marine organisms and plant life. In humans, increased UV exposure can cause skin cancers, cataracts and immune system damage.
Link 1 : https://www.who.int/health-topics/ultraviolet-radiation#tab=tab_1
Link 3 : https://youtu.be/KiJfRsx5TFw?si=TINch0cXq6ZzdguE
How These Study Effect On Monthly Direct Sunlight Recharge Non Electric Car Air Purifier Concept:
Some brands claim that their normal or impregnated activated carbon products can be recharged simply by placing them in direct sunlight for 1-2 hours. They assert that sunlight fully desorbs all toxic gases previously adsorbed onto the carbon.
If this were true, upto 56% of UVA rays (depending on sunlight intensity) entering through a car's side and rear windows would already trigger complete desorption of those gases. At night time all the toxic gases will adsorb and at day time (Heat - 60°C to 70°C Inside Car) + (Sunlight UVA Rays - 29% to 56% through Side Mirrors) it will desorb inside the car. So you are again sitting in between those toxic gases.In that case, what would be the point of hanging these normal or impregnated activated carbon devices from the rearview mirror inside the car?
University of Utah,Health Department Research has found that while the front windshield blocks 94 percent of UVA rays, the driver's side window only blocked 71 percent. To date, multiple studies have shown those that spend much of their time driving have an increased risk of skin cancer and UV-induced skin damage on the side of their body exposed to the sun. This damage is primarily due to the UVA light passing through the driver's side window.