If they'd do something about the buses and trucks that belch an amazing amount of black pollutants, there would be a notable improvement in the air quality. No car days in a small part of the city on one day of the month is like putting a bandaid on a gaping wound.

Also, how about a no horn day; that would be a pleasant change and quite a relief.

Finally, Jason, I love the expression "over driven city." Great comment.