Queens commuters and Mets die-hards, rejoice: the No. 7 train, which stretches west to east from Times Square in Manhattan out to Flushing, Queens (with a stop at Citi Field in between), is the cleanest line in the New York City subway system.
But if you're headed to Bay Ridge, out to Forest Hills, or just heading down Broadway in Midtown �" well, better take a Kleenex or two. The R train ranked dead last, with just 25 percent of cars considered clean. (Its sometime-companion train, the N, clocked in at a not-much-better 29 percent.)