No. 1 New OrleansCan you imagine the cleanup required after Mardi Gras? Both tourists and Mother Nature have sometimes been hard on the Crescent City, which readers voted the dirtiest in America. But that doesnt stop the good times from rolling on. Voters embraced the citys fun-loving spirit, ranking New Orleans first for its nightlife and eclectic people-watching. No. 2 Philadelphia The City of Brotherly Love was voted the fourth dirtiest city last year and just narrowly avoided the top slot for sloppy this time around. The locals may not be helping with those first impressionsthey ranked near the bottom of the style category, as well as in the bottom five for being environmentally aware. No. 3 Los AngelesThat infamous rep for smog is tough to shake: the City of Angels, which is No. 3 for the second year in a row, continues to do poorly in national air-quality tests. AFC voters also put traffic-clogged Los Angeles in last place for being pedestrian-friendly and in the bottom three for overall quality of life. No. 4 MemphisNothing is tidy about barbecue or the blues, two of Memphiss biggest tourist draws. This city on the banks of The Big Muddy has more to work on than dirtiness; it came in last place in the AFC for being environmentally friendly, as well as for feeling safe. No. 5 New York CityLast years dirtiest city is looking a little fresher these days. But AFC voters seem to champion New York because of its less-than-sterile vibe, and not in spite of it. Theres world-class culture, cool neighborhoods, and diverse locals. Just be prepared to pay for it: NYC ranked as the most expensive city in the nation. No. 6 BaltimoreThe Inner Harbor is a crowd-pleaser, but AFC voters werent impressed by Charm Citys overall cleanliness or its more land-based features. Baltimore came in next-to-last place for its public parks, hotels, and even interesting people. No. 7 Las VegasThis is the No. 1 town for wild weekends, so its no surprise that Vegas makes it into the Top 10 for dirty disarray. Impressively, Sin City has actually improved its standing by two slots since last year. And if youre willing to splurge, any semblance of grittiness may disappear: Vegas scored No. 1 for luxury hotels and No. 2 for both luxury shopping and big-name restaurants. No. 8 MiamiAFC voters loved Miamis bar scene and its upscale dining, but all that hoopla takes its toll on a personand on a city. AFC voters ranked the Florida hot spot poorly not only for cleanliness but for safety. No. 9 AtlantaMany cities that made the dirtiest Top 10 scored well for having a vivid nightlife, cool neighborhoods, or great live music. Alas, Atlanta couldnt claim any of those in the survey. At least the city has its qualityand sloppybarbecue going for it. No. 10 HoustonThis oil town could stand a green makeover, according to AFC voters. Its cleanliness score worsened by four spots since last year. The general vibe left AFC voters wanting, too. They ranked Houston near the bottom for its parks and weather. The citys collective ego can take great pride in one thing: it topped the AFC charts for its juicy (and no doubt messy) burgers.