= Ozone isopleth diagram
A contour plot of a specified <ozone> outcome against the loadings of <nitrogen oxides> and <volatile organic compounds>. The ridge separating opposite NOx sensitivities distinguishes an <NOx-limited ozone-production regime> from a <VOC-limited ozone-production regime>. The outcome may be peak <concentration>, a time-integrated measure or a model production rate; axes and averaging conditions must be stated. A schematic diagram is not a calibrated emissions-response prediction.
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