Steep improvements seen in Auckland air quality, says NIWA

Steep improvements seen in Auckland air quality, says NIWA

NIWA air quality scientist Dr Ian Longley says nitrogen oxide is found in pollutants from vehicle exhausts.Dr Longley says reductions in levels of airborne particulate matter have been more modest—for example a 20 per cent drop in fine particles (PM2.5) at Takapuna during daylight hours.