Still, the levels of mercury in the air are minute.

In some cases, mercury levels have reached 300 parts per million - 600 times the acceptable level.

High levels of mercury can damage a baby's developing brain.

The highest levels of mercury have been found in the Northeast.

One patient's hair was found to have a mercury level of 390 ppm.

I read that the levels of mercury in sea fish, from pollution, are at danger level.

Tests show he's carrying ten times the acceptable level of mercury.

A Florida panther was found dead with levels of mercury high enough to kill a human.

On average, the mercury level found in these 14 subjects was 48.3 ppm per person.

But now he thinks elevated levels of mercury could be to blame.