New Delhi: Almost two months after Euro IV norms were effected in the country, not a single truck or bus has been rolled out with the new specifications and registered at any Regional Transport Office (RTO) in the city. According to experts, the first lot of heavy vehicles with new emission norms will only be supplied by July, which would be a delay of three months. With the result, even as Euro IV compliant diesel is being sold across the capital, the aim of improving air quality by reducing pollution levels still remains a distant dream. With the Delhi government worried about pollution levels before the Commonwealth Games in October, it is imperative that heavy vehicles like trucks and buses be reigned in as they are one of the major contributors to air pollution in the city.