Figure 4.6: Sources of NOx in Northland (non-specific year) and Gisborne (1996 inventory)
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In Northland: motor vehicles 36.6%, industry 61.9%, and domestic heating 1.4%.
In Gisborne: burn-offs 42.4%, transport 31.5%, natural emissions 15.8%, industry 8.4%, and area 1.8%.
