Abstract: The necessity and efficiency of regulating local emissions cannot be assessed without taking account pollution connected with atmospheric transport. It is advisable to introduce the concept of ecological reserve of the local or urban atmosphere which is a difference between MPC and the background established by pollution transport. To estimate the background open- path measurement systems or local analyzers positioned above the rooftop level can be used. The ecological reserve for carbon monoxide was obtained for the northeast of Moscow by measurements at a height of 85 meters.!6
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