What happened

A fire began through spontaneous ignition or reaction in one of eight tractor-trailers parked at the truck-to-truck loading dock of Clean Harbors' Braintree hazardous-waste facility, described by the operator and local reporting as New England's largest treatment, storage and disposal facility. The trailers temporarily held mixed wastes including paints, epoxies, oil filters, solvents and flammable fuel. Flames spread rapidly because the dock lacked overhead sprinklers; the first hydrant used by firefighters had inadequate pressure and another nearby hydrant did not work. Three trailers were destroyed and others damaged before the fire was controlled at about 01:00 on 17 February. No injuries were reported, and residents were advised to remain indoors during the response. Some neighbors later reported irritated eyes and burning throats. Several local monitors recorded sharp short-term particulate spikes, including readings above the federal 24-hour benchmark, but Massachusetts environmental officials said the measured 24-hour PM2.5 average did not exceed the federal standard and preliminary VOC testing found no concerning elevation above typical background levels. The fire exposed weaknesses in cross-boundary public warnings, hydrant readiness and regional evacuation planning around the densely populated Fore River industrial basin.

When cited sources give different casualty, damage or spill figures for this event, they’re reported side by side above rather than merged into one number. See how confidence levels work.