If youâ€™re buyingÂ sunscreen from a Japanese brand, youâ€™re likely to come across the PAÂ rating system.Â
PA stands for protection grade of UVA system and is theÂ Japanese measurement ofÂ sun protection, which is based on theÂ Persistent Pigment Darkening (PPD) reaction reading at 2-4 hours of sun exposure.Â According to info from the wiki, the Persistent Pigment Darkening (PPD) method is a method of measuring UVA protection, similar to the SPF method of measuring UVB light protection.
These are the three levels of protectionÂ thatÂ are commonly seen:
PA+, PA++ and PA+++.Â
PA+Â providesÂ some UVA protection with a factor ofÂ PPD 2-4
PA++Â providesÂ moderate UVA protection with a factor of PPD 4-8
PA+++Â provides good UVA protection with a factor ofÂ PPD > 8
Which means, you’re better off picking a sunscreen with PA+++ which will provide you withÂ the greatest protection.