I just noticed this is happening to my car, too, PWP. My last car was silver, and I never noticed anything like this happening to it. Of course, it eventually started actually rusting out, so at some point I stopped really noticing any other rust color!
Clay bar and a good coat of wax should take care of it!
It is either from industrial fallout -OR- driving near railroad tracks. If you live near railroad tracks, the dust from their wheels and brakes flies EVERYWHERE!
No worries. It's pretty common, just more noticeable on a white car.
My guess is its rail dust, but either way it is rather common. A lot of new cars are shipped VIA train and this is a common source of particles in the paint of new cars. My brand new 2009 white Fit had little rust specs all over the paint when I brought it home (Chicago, came by rail from the West Coast). I clay bar'd and waxed the car a few days later, clay removed everything stuck in the surface of the paint. Note, you MUST wax the car after clay bar, the surface is naked and exposed to more corrosive particles if you don't wax afterwards.
The CRZ had some as well, mostly on the roof and rear quarter panel, all gone now.
We purchased a warrenty to cover this type of thing with out Milano Red EX CVT. There is no deductable and it covers this type of thing for the exterior and interior finishes. Although I dont really want my dealer doing the work unless they let me watch.
Ive got a rust spot maybe a a cm big on the tip of my hood. Doesnt sound the same though, as clay didnt remove it. Most likely a rock chip just surprised the paint is so thin that its developed rust already.
I had this problem with the white CRX and at a power plant it is a big problem. Our white service trucks have so much of it on the horizontal surfaces they are almost completely orange because no one takes care of them. When I sold the CRX, clay bar and light polish is all that is needed to get rid of it. Not that hard or big of a deal to get rid of.