Local Transport Bill [HL]

My Lords, I am neither a technician nor a scientist. I do not know what the timeframe is for significant changes in air quality. I shall certainly ask officials how quickly it is thought that the LEZ will begin to have an impact, but, as the noble Earl has said, it is something that we all want to see happen. He is gesticulating that he would like a written response. Of course I am more than happy to provide him with one