“Microplastic is a new atmospheric pollutant,” Allen said. (Read more about the emerging science of microplastics.)

“Microplastics are very small pieces of plastic waste. Their presence in oceans and waterways has received a great deal of scientific and media attention in recent years. However, only two previous studies have looked for the presence of microplastics in the air. Both were in cities and their results were comparable, says Allen. Microplastics in the air appear to be ubiquitous.”

“If you go outside with a UV light, set at a wavelength of 400 nanometers, and shine it sideways you’ll see all kinds of plastic particles in the air fluoresce,” she said. “It’s almost worse indoors. It’s all a bit terrifying.”

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“Microplastic is a new atmospheric pollutant,” Allen said. (Read more about the emerging science of microplastics.)