"Throughout the past two decades of research into microplastics, scientists have been finding that they're everywhere, so this is another piece of that puzzle," said Penn State chemistry professor Miriam Freedman.
"In a polluted environment with many more aerosol particles, like microplastics, you are distributing the available water among many more aerosol particles, forming smaller droplets around each of those particles," the professor explained.
The droplets with microplastics in them produced ice crystals between nine and 18 degrees Fahrenheit warmer than those without, demonstrating that rain-producing ice crystals can form at warmer temperatures with these inorganic particulates.
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