The National Weather Service has issued an air quality alert for Pasadena and the rest of the San Gabriel Valley, warning of harmful fine particle pollution from fireworks that is expected to last until 3 p.m. Sunday, July 5.
The alert, based on a South Coast Air Quality Management District (AQMD) advisory, covers most of Los Angeles County.
Particle pollution levels can vary by time and location depending on emissions and local weather conditions, meaning some areas of Pasadena and surrounding communities could see worse air quality than others during the alert period…