I don't know if this will show well on the ISH, but coming back we saw smog from just east of Orangeville until about Trenton - a patch about 250 miles wide as we skirted north of much of Toronto (via 9 to 404 to 407 to 12 to 401)
Here is a detail of a picture of a slice of the horizon in Kingston on a recent sunny day at about 10 am:
Here is a detail of another picture from this afternoon driving through the Holland March on highway 9 near Newmarket at about 2 pm:
Just to ensure I am not fixing this, here are strips of the same shots taken to the north of Kingston on the 25th and the Holland Marsh today, rotated to show a scale of colour from the horizon to the sky:
Kingston
Holland Marsh
I took the Holland March picture to show the good black earth, oddly enough.

Comments
Craig - December 28, 2003 7:32 pm
No smog in Paradise today Al, just a brisk breeze from the North.
Alan - December 28, 2003 7:41 pm
None here either [...and a "brisk wind" here does not place trees at risk].<p>Pretty gross when you go around the big smoke on days when this is happening. Mostly up from Pennsylvania I understand. We are lucky here that there are no big ugly industries due south - we get smog about as often as the Maritimes. I understand from a pal who is a very experienced environmental lawyer that it is not a problem so much of nation to nation pollution as town to town. A city like Peterborough got hit hard a few years ago when a corresponding city exactly, say, 300 km to the south opened a factory spewing exactly right grade of pollutant from exactly the right height of smoke stack to drop all its load 300 km north.
Craig - December 28, 2003 8:02 pm
Weirdness here. 13 on Christmas and I was out with the critter today thinking it was much like April. Actually considered putting the battery back in the bike and going for a ride - just for bragging rights.
Alan - December 28, 2003 9:00 pm
The smog may be travelling on warm winds here as well - plus 9 or 10. You'd be on trhe bike here - gas at Newmarket was 56.9 cents.