Inclusion Criteria:  Adults 18 years or older: The evidence for personal strategies to reduce air pollution exposure has been focused on adults Live in Seattle, WA: The study is designed to focus on Seattle, WA such as using EnviroFlash alerts Own a smartphone: The participant requires a smartphone to setup the Flow app for the air pollution sensor Not traveling in the near-term: The study is designed to assess air pollution patterns in the local Seattle area Leave your home for at least 7 hours per week: Participants will use a wearable air pollution sensor to measure air pollutant levels from indoor and outdoor sources