“The worst factor in air pollution is soot, the material that gives smoke from diesel vehicles its distinctive blackness. Blogger Harbir Singh lays out the problems with current government vehicle emissions standards, the need to strengthen those standards as soon as possible to meet US EPA and Euro V and VI standards, and proposes limiting excise taxes on vehicles to minimize economic cost of enforcing new standards on the auto industry. Times of India (Blogs). Read it on DelhiAir.org