However, many of these substances may bioaccumulate in the human body, thus reaching dangerous concentrations.

It reaches peak concentrations at 1 hour and is nearly completely eliminated within 8 hours.

It takes about 2 hours to reach maximum concentrations in the serum.

This can create an explosion hazard if the gas reaches sufficiently high concentrations in adjacent buildings.

"Carbon dioxide within the Falcon will not reach fatal concentrations for approximately fifteen minutes."

Over years or decades of exposure, it can reach concentrations that raise the risk of lung cancer.

Methyl mercury can also biomagnify up the food chain, and reach high concentrations in top predators.

A single exposure to chloroform, if it reached high enough concentrations in his blood, could harm the kidneys and liver.

It works its way up the food chain through bioaccumulation in the environment, reaching high concentrations among populations of some species.

He guessed the last odor would easily reach unpleasant concentrations when the alleys were filled with coaches.