The phrase
"dangerous byproducts" refers to substances or materials that are produced as a result of a process or activity, which can be harmful or pose a risk to human health, the environment, or both.
Full definition
Public water fluoridation is really just a secret way for chemical companies to dump
the dangerous byproducts of phosphate mines into the environment.
We're all fossil fuel junkies, and
the dangerous byproduct of our habit — CO2 — is killing the planet.
If you've been exposed to mold and have reacted to it, then you're likely sensitive to mycotoxins, which are
the dangerous byproduct of mold.