We make the contributions to do stuffs with the scrubber systems.
and so what what you know what we do to make contributions so that basically we go and do things like put in uh high-tech scrubber systems uh that uh scrub out the NOX and uh VOCs and and the ammonia compounds uh like all the acids uh to a certain level we are very um uh aware of the opacity which is the thickness of a stack emissions so if you don't see anything coming out of a stack the opacity is zero or twenty or there abouts