I'm breathing in the chemicals

from Imagine Dragons – Radioactive Lyrics on Rap Genius

Meaning

This is about nuclear pollution in the aftermath of a conflict. Nuclear fallout contaminates the land and the air after a nuclear blast, and radioactive isotopes can hang around in the air for years.

It could also refer to smoking, either by the narrator himself or everyone around him. In the music video, it immediately shows a man smoking after this line.

After this line, Dan takes a deep breath in and out.

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