Yes. Chalk pastels are dangerous for the artists using them. It is advised that you wear a mask to avoid breathing in the toxic dust. You should not use chalk pastels around food because of the chemicals used to make the pastels, and should be in a well-ventilated area. If there are so many of these hazards just for the user, the potential damage to be done to the environment may be even worse. The pastels are designed for human use, and are still dangerous to be used, so there’s no reason to think they would not be dangerous for the surrounding environment.
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