Perhaps the most comprehensive paper on NOx-ozone relationship is provided
here
Also, damages from NOx emissions in two heavily populated counties in the U.S. (ostensibly Orange County, CA, and Cook County (Chicago), IL) are actually negative (i.e., marginal NOx emissions are beneficial) because damage from NO2 itself is more than offset by destruction of ozone by NOx there, according to a well-respected damage model ("APEEP").
NOx does cause damage in all other counties in the U.S., but it's generally less than most of the other regulated pollutants.
Sorry to be sceptical but... as just a regular sort of guy I have no idea how they arrive at this stuff, how accurate it is, if it is real or just a government/industry sponsored make it look this way project. What I am totally confident of is that in a few years all this data will be outdated, invalid and the newest/greatest "science" will tell a different story. I have been around long enough to recognize the cycle.
Back in the late '60s and early '70s the "science" told us that the earth was getting colder every year and we were headed for another ice age due to the effects of humans activity. They had all the charts and scientific data to back it up. It was real!!
Here is what I do know:
Nearly every year here in Alberta we have forest fires that totally blanket our province in smoke that you can see, smell and taste for weeks at a time. It even shows up as far away as Florida and Europe depending on the prevailing winds. Where are the statistics on emissions on that? The chemical composition? The damage cost estimates? The carbon particulate size?
And above all, with the trend now toward carbon taxing, who is paying for all that carbon emissions?
I understand there is a similar case to be argued with active volcanoes too.
I am not saying that we don't need to reduce our emissions, just than emissions from the burning of carbon based fuel has been a part of the natural cycle on this earth for thousands of years and our part is pretty small.
Here is something else I know:
Back in the '70s when we changed over to unleaded gas I was working in the automotive industry and every time we started up a car on unleaded fuel with a catalytic converter to move it in the shop the stink was so bad we had to open the shop doors afterward. That rarely occurred previously.
That same stench is everywhere in our cities here and I can smell it every time a car passes me in the rural area. Like others have said, gasoline powered vehicles stink worse than our modern diesels!