https://cdnph.upi.com/ph/st/th/9761781195682/2026/upi/7080103ffe8eed4a6678d484541a1a8b/v1.5/Hazardous-materials-incident-causes-lockdown-evacuation-at-Pentagon.jpg" /> An air quality issue related to a hazardous materials incident has caused multiple floors to be locked down at the Pentagon on Thursday.