Fireworks, Wildfires Drive Hazardous Air Quality Across US

Following Independence Day celebrations, multiple regions across the United States have experienced deteriorated air quality largely due to fireworks and wildfires, prompting health advisories. In California's Central Valley, the 'bowl' geography traps pollutants, leading to moderate air quality levels that pose risks especially for those with respiratory sensitivities, with experts recommending nasal rinses and allergy medications. Southern California faced a hazardous air quality alert influenced by the expanding Madre Fire and fireworks smoke, with officials advising residents to stay indoors and limit physical activity. Delaware issued an 'ozone code orange' alert warning sensitive groups to reduce outdoor exertion due to particle pollution and wildfire smoke, expecting conditions to improve the following day. Southeast Michigan also reported unhealthy air quality for sensitive groups attributed to stagnant weather and fireworks, with officials urging residents to limit outdoor activities and stay hydrated. These widespread advisories highlight the health impacts of combined wildfire smoke and fireworks-related pollution during the holiday period.