Smoke Sense is a citizen science initiative that brings wildfire smoke and health resources to the palm of your hand. Given the growing public health burden caused by more frequent large wildfires, we launched the Smoke Sense initiative to increase public and scientific engagement on healthy behaviors when wildfires occur. Smoke Sense enables users to explore their current and forecasted daily air quality, maps of fire locations, and satellite images of smoke plumes, and learn about health consequences of wildfire smoke. The app promotes preventive health behaviors by inviting users to record their smoke observations and health symptoms, play educational trivia games, and explore what others are reporting. Smoke Sense provides just-in-time information about smoke when participants need it the most and shows individuals how they can personally benefit from taking actions to reduce exposures. With Smoke Sense, users make a personal connection to smoke as an environmental exposure while raising personal consciousness about the associated health risks.