“Air pollution”, the theme for World Environment Day 2019, is a call to action to combat one of the greatest environmental challenges of our time. Chosen by this year’s host, China, the theme of World Environment Day 2019 invites us all to consider how we can make changes in our everyday lives to reduce the amount of air pollution we produce, and thwart its contribution to global warming and its effects on our own health.

Air pollution is an invisible killer that lurks all around us, preying on the young and old. Learn how it slips unnoticed past our body's defenses causing deaths from heart attack, strokes, lung disease and cancer.