If you thought that your duty as an environmentally sensitive citizen ended with pasting a Pollution Under Control (PUC) certificate on your car, think again. Your vehicle is still emitting gaseous exhausts which affect the environment, but which are not checked when you are granted the PUC certificate. "The existing norms are extremely lax as harmful elements - including hydrocarbons, nitrogen oxide and particulate matter - are not taken into account," says chief of Centre of Science and Environment's air pollution unit Anumita Roy Chowdhary.