The existence of nano sized plastic (NP) has been discussed heavily in recent years, however 5 physical proof from environmental samples and direct comparisons to characterized 6 microplastics is limited. Here we compare microplastic (MP) particles and counts (>10µm) to 7 NP particle (<0.45µm) mass concentrations from deposition at a remote field site in the French 8 Pyrenees (elevation 1425 m a.g.l.). Using Thermal Desorption Proton Transfer Reaction 9 Mass Spectrometry (TD-PTR-MS) analysis, the data shows that NP is present in atmospheric 10 deposition in quantities up to 2.0x10 5 nanograms m-2 day-1 , comparable to that of the >10µm 11 microplastic (up to 1.1 x10 5 nanograms m-2 day-1). This comparison indicates the quantity of 12 NP and MP may be similar in this atmospheric deposition, however the estimated particle 13 count for NP is understandably multiple orders of magnitude greater compared to MP. 14 Backward trajectory modelling was used to consider the transport of these MP and NP 15 particles. This highlighted the extended spatial influence of NP and its propensity to remain 16 elevated over a 7-day period.