Depending on weather conditions, smoking 3 packs of cigarettes a day is about the same as living in which city

Question

A. Los Angeles
B. Mexico City
C. Athens
D. Rome
E. London

Answer 1

This site claims that Mexico City's air is equivalent to 2-3 packs a day, but the article does not seem to be of a serious nature.
http://www.living-in-mexico.com/archives/00000029.htm

This one says two packs a day for Mexico City.
http://www.pbs.org/journeytoplanetearth/hope/mexicocity.html

This one says Beijing:
http://www.vif.com/users/hemib/beijing_anglais.html

Here's a table that compares the pollution in some English cities with number of cigarettes a day. It states that Oxford's air was the equivalent of a 3-pack-a-day habit, but that's not one of your choices.
http://www.guardian.co.uk/uk_news/story/0,,1292524,00.html

Answer 2

I know that LA has some pretty bad enviromental conditions but the EPA is also monitoring them. So I am going to say either Mexico City or London

Answer 3

It is much more than 10 times worse smoking that many cigarettes than living in LA before all the air pollution standard dramatically cleaned up the air.

Answer 4

I choose L.A.