Which Louisiana cities are dirtiest? Lawnstarter ranked 152 US cities from dirtiest to cleanest. Cities were ranked based on pollution, living conditions, infrastructure, and consumer satisfaction. Houston is America’s dirtiest city. This is large because of pollution from its petrochemical industry. The City’s pollution level is #3, behind San Bernardino, California (#2) and Peoria, Illinois (#1).
So, which city is Louisiana’s dirtiest city? It’s not New Orleans. Shreveport is the dirtiest city in Louisiana, and #11 nationally. New Orleans is Louisiana’s second dirtiest city. It’s ranked at #54 nationally. Anchorage, Alaska, and Honolulu have America’s cleanest air.