I live in London, and really noticed the effects of diesel exhaust (particularly buses along busy roads) on my breathing in the past couple years. I've lived he

I live in London, and really noticed the effects of diesel exhaust (particularly buses along busy roads) on my breathing in the past couple years. I've lived here for over 8 years. It's the NoX that I notice much more than the soot. I get breathing difficulties after walking past buses (the sharp smell of the NoX fumes is pretty noticeable). I've had bronchitis twice in the past two years. I've even started changing my walking routes to avoid busy roads entirely due to the diesel pollution. What adds insult to injury is that many of these buses advertise as "Enviro" because their Diesel engines produce marginally less CO2 than a gasoline engine.