The idea was that anything that pure would refuse to cross over a grave inhabited by some kind of evil pollutant.

这是因为所有纯洁的东西，都会拒绝跨越由于被邪恶的生命居住而污染的坟墓。

youdao

The researchers Katherine Ensor and Loren Raun cross referenced the time and place of the cases against air pollutant levels recorded by the extensive network of air monitors throughout the Houston area.

FORBES: Researchers Prove Air Pollution Causes Heart Attacks