Depositing pollution shielding technologies from leave-on cosmetic products is published and available in the market. However, sufficient ingredient deposition from rinse-off products such as shampoo to shield the hair surface presents a challenge due to high surfactant content and rinse process. Air pollution contains toxic gases (ozone, NO, SO etc.), liquid droplets (tar, cooking/fuel fume), and solid particles (PM2.5/10, heavy metal etc.). Air pollution protection includes not only protecting hair from chemical damage (antipollution), but also physical adhesion of the pollutants (anti-dust).8 

In a current study, acrylamidopropyltrimonium chloride/ acrylamide copolymer (APTAC/ACM) has been evaluated in both silicone-free and silicone-containing shampoos for hair protection from chemical damage i.e. protein degradation and physical impact from dust adhesion. A new conditioning polymer deposition mechanism-has been introduced. The experiment demonstrated that APTAC/ACM copolymer deposited on hair surface will form a transparent, elastic and hydrophobic complex layer with anionic surfactants during shampoo washing. This hydrophobic complex can provide prevention of dust deposition and effective pollution protection against hair damage.