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AP explains the risks behind the substance that was burned, the resulting air quality concerns and how it's being monitored. Days after crews released and burned toxic chemicals transported by a wrecked train in Ohio, residents remain in the dark about what toxic substances could be lingering in their evacuated neighborhoods. Mike DeWine earlier ordered evacuations in the area of the derailment that has been smoldering since Friday night. Justice said the agency is still working with experts to determine safe levels for various gases before reopening the evacuation zone. "Sunlight can change that, the movement of air can change that, temperature can change that."