The combination of common hair care products and the heat of styling appliances can produce levels of nanoparticle air pollution on a par with standing by a busy road, a new study reveals.

Particles up to 500 nanometers in size – around 200 times smaller than the width of a human hair – are created in the process, which are fine enough to get deep into the lungs . These findings raise serious questions about the health hazards we might be exposing ourselves to with everyday hair care routines.

The study was carried out by a team from Purdue University in the US, using a purpose-built tiny house lab. The lab has previously been used to examine chemicals released by hair care products, but here the researchers wanted to take a closer look at the associated air pollution.

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