To understand the Earth's atmosphere and how it affects our health and climate requires knowledge of a huge variety of gases, many at concentrations around a trillionth of nitrogen and oxygen. In this lecture, Professor Lucy Carpenter will explain how atmospheric scientists measure and understand these minute concentrations of gases and particles. Join us to find out new discoveries on how our atmosphere responds to natural and human activities, and how the oceans are now thought to play a significant role in its composition. Professor Lucy Carpenter was awarded the 2015 Royal Society Rosalind Franklin Award and Lecture for her scientific achievement, her suitability as a role model and her project proposal to promote women in STEM.