Which problem was particular to smelting operations in sudbury?

In Sudbury, smelting operations faced significant environmental challenges, particularly related to air pollution caused by the release of sulfur dioxide from the smelting process. This resulted in acid rain that severely impacted local ecosystems, damaging vegetation and water bodies. Additionally, the emissions contributed to public health concerns and prompted regulatory scrutiny, necessitating the implementation of measures to reduce pollution and rehabilitate affected areas.