Even though the Environment Pollution (Protection and Control) Authority is pressing for a deadline of May 15 to introduce the Lambda tests as a regulatory norm for in-use petrol vehicles -- to keep a check on pollution -- the automobile industry is insisting that more "studies'' are needed before the required steps can be taken. Deliberated during a recent meeting with EPCA, the automobile industry is looking for more time, despite the fact that the Lambda test has been introduced in most developed countries for several years now. "Our vehicles today are meeting global standards. They are all Euro II vehicles. So there is no reason why the Lambda test should not be enforced. Most of the manufacturers are claiming that they have never regulated Lambda while some of them are claiming that their vehicles would be naturally meeting the standards,'' said environmentalist, Sunita Narain.