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Question: What's the difference between PPD and PA?

Answer:

PPD and PA both measure how well a sunscreen protects against UVA rays. Because there is no international standard for this measurement, some countries use PPD (ex. PPD 20) and other countries use PA (ex. PA++).

The higher the number or the more plus signs there are, the better protection you get from the sunscreen. PA+++ is approximately a PPD of 8.

To calculate the PPD of your sunscreen, check out this website. You have to register but it’s free.

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