Ganguly and Ariya 18 synthesized three microplastics types (PP, low-density PE, and highdensity PE) in the laboratory and quantified their freezing properties using a droplet freezing technique. In Figure , we have compared our freezing results with their PP microplastics. Our observed 𝑛 𝑚 (𝑇) data are lower than the literature values by 1-4 orders of magnitude for freezing temperatures between -16 and -22°C. In addition, we calculated 𝑛 𝑠 (𝑇) values by computing them from the 𝑛 𝑚 (𝑇) values reported by Ganguly and Ariya 18 using an average diameter of 193 nm for their microplastics, which corresponds with their own measurements. Using this approach, the calculated 𝑛 𝑠 (𝑇) values based on the data from Ganguly and Ariya 18 closely match our microplastics data (Figure ). This suggests that the difference in 𝑛 𝑚 (𝑇) values between our study and Ganguly and Ariya 18 can be attributed to differences in the surface area used in the experiments, rather than a significant variance in the ice nucleation ability per unit surface area.