Delhiites are now breathing better quality air. There has been a significant reduction in pollution at traffic intersections and industrial areas with respect to carbon monoxide, nitrogen dioxide, lead sulphur dioxide and suspended particulate matter. As for residental area, nitrogen dioxide and lead contents in the atmosphere has come down.According to the latest figures made available by the Central Pollution Control Board(CPCB), the levels of various pollutants in ambient air have shown a reducing trend during 1999.