Professor Alan Shihadeh, dean of the Maroun Simaan Faculty of Engineering and Architecture, explains what he and his colleagues have learned in AUB’s Aerosols Research Lab over the last 20 years. From water pipe smoking to Beirut’s air after the port explosion and mass use of diesel generators, aerosols are often dangerous to our health, he notes. He also talks about how the knowledge they generate can help shape public policies in Lebanon and around the world.