More: Air Quality Index (AQI) Basics What do the numbers mean? 0–50: Good – Air quality is considered satisfactory. 51–100: Moderate – Acceptable for most, but may affect very sensitive ...

In Lansing, as of 9 a.m. on June 5, AirNow's Air Quality Index reflected an "unhealthy" reading with a PM2.5 of 183 — meaning, people should stay indoors if possible.