They just completed the renovation of about 10 bridges over the expressway here. I know the smell you describe. It’s the epoxy paints they use to repaint after media blasting the steel. The tenting is to contain the blasted off old paint and to minimize the drift of the new paint over spray. It stinks big time. I’ve driven through it many times and never had any adverse reaction from the car. Doesn’t mean it couldn’t happen though since just a thin film of the wrong kind of RTV curing can pollute an O2 sensor.