Calculate time to sunburn and recommended SPF based on UV index and skin type.
A measure of ultraviolet radiation intensity. 0-2 is low, 3-5 moderate, 6-7 high, 8-10 very high, 11+ extreme.
SPF 30 blocks 97% of UVB rays. SPF 50 blocks 98%. Reapply every 2 hours and after swimming.
Yes significantly. Type 1 (very fair) burns in minutes, while Type 6 (very dark) has much more natural protection.