Welcome back to #guessthatmicroenvironment! The goal of this series is to improve our collective understanding of how our daily actions and interactions influence the air that we breathe. This clue was posted originally on April 20th, 2020. #guessthatmicroenvironment * Total number concentration of 10-300 nm particles * Inset 'zoom-in' glimpse of first

Welcome to the first post in our #guessthatmicroenvironment series! The goal of this series is to improve our collective understanding of how our daily actions and interactions influence the air that we breathe. The first clue went up April 10th: #guessthatmicroenvironment is back! We'll aim to post new ones every