6 comments to "gauge the average of nitrogen dioxide or ozone, do the following:(1) a measure of the average nitrogen dioxide at 1 hour, use the apparatus and measuring chemical system or another system of sensors that pollution control Department for approval and.(2) a measure of the ozone averages at 1 hour or 8 hours at a time, use the apparatus and measuring chemical system or another system of sensors that pollution control Department for approval, "he said.
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