How polluting is diesel?
At 450 trains a day, Tier 4 diesel engines will generate pollution equivalent to more than 4,000 trucks a day driving through densely populated neighbourhoods. Furthermore, Tier 4 engines do not reduce the emissions of the smallest and most lethal particulate matter, PM2.5. In fact, studies have shown they concentrate PM2.5, making Tier 4 engines possibly an even greater threat to human health than older models.
