Last week a train derailed in East Palestine, Ohio, sending 50 cars carrying toxic chemicals careening off their tracks. The resulting fire burned for days, forcing hundreds of evacuations and blanketing the small village on the Ohio-Pennsylvania border in smoke. Runoff from the site contaminated two streams nearby. Over the next week, as officials worked to avoid a deadly explosion that could launch “deadly shrapnel as far as a mile,” they slowly released vinyl chloride, a colorless gas linked to various cancers, from five of the railcars that were transporting it to its destination.

The blaze is now under control, and residents were allowed to return to their homes late Wednesday, five days after the train derailed. Local authorities say the air and water are safe. The Environmental Protection Agency, or EPA, has been conducting air monitoring in the area. On Wednesday, the agency reported that its monitors detected volatile organic compounds, a class of toxic chemicals, but that their levels were below thresholds that trigger public health concerns. It also reported detecting particulate matter, the fine soot that makes up smoke and causes respiratory issues, above public health thresholds.

The disaster is a reminder of the health and safety risks that accompany reliance on fossil fuels. Vinyl chloride, the chemical released from the railcars, is a petrochemical produced from the hydrocarbon ethylene. Its primary use is in making polyvinyl chloride, or PVC, a type of plastic that is widely used to make pipes, flooring, wire insulation, and a slew of single-use medical devices.

The industry group American Association of Railroads, of which Norfolk Southern is a member, has also fought stricter safety standards including an updated braking system. Electronically Controlled Pneumatic brakes, or ECP brakes, can decrease train stopping distances and could have prevented the derailment last week, according to The Lever. Norfolk spent years lobbying against the use of these brakes, and the Ohio train was not outfitted with the technology.

At least four class action lawsuits have been filed against Norfolk in the last few days. Residents have claimed the derailment and the resulting evacuation forced them out of their homes and businesses causing economic losses, emotional distress, and exposure to hazardous chemicals.

Read the full article about the Ohio train derailment by Naveena Sadasivam at Grist.