Our research group investigates the emissions, chemical transformation, and impacts of organic trace gases in the Earth’s atmosphere. Volatile organic trace gases, hereby VOCs, are emitted from biogenic and anthropogenic sources that vary seasonally, spatially, and annually. These emissions undergo photochemical reactions that lead to gaseous and condensable products, which impact local air quality and lead to the production of secondary organic aerosols influencing the Earth’s climate. Our goal is to identify and quantify the impact and fate of such emission sources on air quality and climate by performing airborne, mobile, and stationary measurements in urban and remote locations around the world using state-of-the-art techniques focused on mass spectrometry.