I've lived in Oregon for a decade, meaning I've experienced multiple wildfire seasons. You learn quickly, in these conditions ...

This can be understood from the accompanying chart, which is a graphical translation of CPCB’s formula for converting PM2.5 concentrations into its subindex, which also ends up being the AQI for ...

PM2.5 levels due to smoke have reached the Unhealthy Air Quality Index (AQI) category or higher in Altadena, Downtown Los Angeles, Malibu, Pacific Palisades, Pasadena and surrounding fire-affected ...