Yes it seems weird. "We use this NO2 as indicator of particulate, as it's too difficult to measure directly.." Frankly I would not be surprised if Exxon, BP an

Yes it seems weird. "We use this NO2 as indicator of particulate, as it's too difficult to measure directly.." Frankly I would not be surprised if Exxon, BP and Shell would have lobbied these emission regulations. After all they get to sell 20% more diesel. But again I might be completely wrong.