A massive blaze erupted at SPS Technologies, an aerospace manufacturer located in Montgomery County, Pennsylvania, leading to severe air quality concerns and prompting officials to issue a shelter-in-place order for nearby residents. The fire, which followed an explosion, has resulted in the closure of local schools and the evacuation of some businesses and residents. Hundreds of firefighters are battling the flames, and emergency teams are advising individuals in the Abington, Jenkintown, and Cheltenham areas to evacuate voluntarily. Authorities are closely monitoring air and water quality as the situation develops, with updates being provided every two hours. The incident highlights serious safety concerns, as the facility had a history of EPA violations related to toxic waste management.