PNNL

Abstract

The current global crisis with plastics is a pressing issue, as the extent of plastic pollution and the efficacy of policies to address the issue have yet to be standardized. While research has long demonstrated the widespread prevalence of microplastics, defined as plastic debris less than 5 mm in size, only recently has it been shown that microplastics are airborne. These microplastic aerosols are of increasing concern due to their potential environmental and human health impacts, yet the science and policy behind airborne microplastic particles are still in their nascent stages. Global standardization for monitoring airborne microplastics is needed, similar to the Keeling Curve for CO2 emissions. The implementation of a live, constantly updated graph that charts the concentration of airborne microplastics, like the iconic Keeling Curve for carbon dioxide, has the potential to be a powerful tool in tackling the issue of airborne microplastic pollution. This solution requires two crucial steps as outlined below: the first involves the selection of a standardized technique for continuous online monitoring of airborne microplastics, while the second involves identifying a representative measurement site and the creation of a global map that acknowledges regional variability, since microplastics are not as well mixed as greenhouse gases like CO2. By taking these steps, we can provide a clear and comprehensive guide for stakeholders to track progress towards the goals set out in the forthcoming UN microplastics treaty and make significant strides towards a healthier and more sustainable planet.