As the summer draws to a close and after completing yet another road trip with my three children, I’m reminded of the importance of sun protection in cars. While sunscreen is a must before heading to the beach or pool, many people forget to apply it when embarking on long drives. It’s crucial to raise awareness about the risks of UV exposure in cars.
Why UV Protection Matters in Cars
Windshield glass is federally regulated to allow a certain amount of light for visibility, but there are no requirements for sun protection. Many don’t realize that while UVB radiation is blocked by the glass, UVA radiation still passes through. It can reach both the skin and eyes. Windshields are made of laminated glass that includes two layers of glass with a plastic layer in between. Therefore, windshields offer protection from both UVA and UVB radiation. On the other hand, side and rear windows are made of tempered glass that lacks the protective plastic layer. These offer no protection against UVA rays.
The Risks of UVA Exposure
A study by Butler et al. found that 53% of head and neck cancers occurred on the left side of the face. Which is most often exposed to the sun through driver-side windows. The more time spent driving, the higher the likelihood of developing skin cancer on the left side. Unfortunately, many automakers have not addressed this problem by using higher-SPF glass. Why? Because this could increase vehicle costs. However, a more affordable and effective alternative is UV window tinting films.
UV Protection with Aftermarket Window Films
Aftermarket window films, available for $150-$200, can be applied to cars to improve UV protection and keep the interior cooler. UV films not only block harmful rays but can also reduce the need for air conditioning. This could improve the fuel economy and benefit the environment. Companies like Solar Gard, LLUMar, and 3M offer window films that block up to 99% of UV rays, but be aware that the legal tint limit varies by state. Most states allow a visible light transmission (VLT) of 50% for the driver’s and front passenger’s windows and 35% for the rear windows.
Protecting Your Skin and Eyes on the Road
For patients with severe photo-dermitides, I often provide a letter of medical necessity to request a higher tint percentage from the DMV. Regardless of your ability to tint your windows, sunscreen is recommended for all passengers. Use a broad-spectrum sunscreen, even for short drives, and keep the sunroof closed for extra protection. Additionally, polarized sunglasses for both adults and children are essential for avoiding UV damage to the eyes, especially during long car trips. For passengers who frequently use screens and tablets, sunscreen and blue light protection glasses are also advised.
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