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Opacity is a measure of how much soot or smoke may be contained in stack
emissions. The more smoke that is contained in the emissions the higher
the level of opacity. Continuous opacity monitors located after all of the
air pollution control equipment measure the opacity of the emissions from
each boiler. Opacity readings are typically less than 3% and that is as low
as the opacity monitors can accurately measure. Typically the human eye can
not detect or see smoke that is less than 5% opacity. You won't see smoke
from a modern trash-to-energy plant. We have a permit limit established by the
Department of Environmental Protection of 10% opacity averaged
every six (6) minutes.
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