A year ago on 3 February a train carrying toxic chemicals derailed in a small village on the border of Ohio and Pennsylvania. A few days after the derailment, officials decided to vent and burn the chemicals it was carrying to prevent an explosion. Those still living in East Palestine and the surrounding communities have been told the air they breathe is safe, but many aren’t confident in what they’re being told. So what led to the derailment? What’s changed in terms of legislation to make sure this kind of accident doesn’t happen again? And how are residents coming together to advocate for their safety and that of fellow Americans in the future? The Guardian’s fossil fuels and climate reporter, Dharna Noor, travelled to East Palestine to see for herself what’s changed in the 12 months since the disaster