bbc.com
Choosing and Using Sunscreen Effectively
To protect against sunburn and skin damage, use sunscreen with high SPF (at least 30) and a high star rating, reapplying every two hours. UVA causes aging and skin cancer, while UVB causes sunburn. 'Once-a-day' sunscreens may not offer consistent protection.
- How do SPF and star ratings relate to UVA and UVB protection, and why is both crucial for skin health?
- The SPF number indicates the percentage of UVB rays blocked; for example, SPF 30 blocks approximately 97%. Star ratings denote UVA protection, with more stars signifying better protection. Both UVA and UVB rays contribute to skin damage and cancer, so high SPF and star ratings are vital for comprehensive protection.
- What factors determine effective sunscreen protection, and what are the practical implications for safe sun exposure?
- When choosing sunscreen, look for a high SPF (at least 30) and a high star rating (indicating good UVA protection). Reapplication every two hours is crucial, regardless of SPF, due to sweat, water, and imperfect application. Using expired sunscreen is ineffective.
- What are the implications of 'once-a-day' sunscreen claims, and how do consumers ensure adequate protection during prolonged sun exposure?
- The effectiveness of 'once-a-day' sunscreens is debated, with studies showing a significant reduction in protection after several hours. Consumers should prioritize frequent reapplication (every two hours) of a good quality sunscreen to ensure effective protection, rather than relying on extended-wear products.
Cognitive Concepts
Language Bias
The language used is largely neutral and objective. While terms like "ideal conditions" and "perfectly" might be slightly subjective, they are within the bounds of acceptable descriptive language.
Bias by Omission
No significant bias by omission detected. The article covers key aspects of sunscreen use and sun protection, although it could benefit from including information on different skin types and their varying sensitivities to sun exposure.
Sustainable Development Goals
The article provides guidance on choosing and using sunscreen to protect against harmful UV rays, thus promoting skin health and preventing sunburn and skin cancer, which directly contributes to SDG 3 (Good Health and Well-being). The advice on seeking shade and covering up further enhances sun protection measures.