Los Angeles listed in top-5 dirtiest U.S. cities, report says

PREV. COVERAGE: LA sanitation crews clean up Hollywood homeless encampment

A homeless encampment near an elementary school in Hollywood was cleaned up just days before classes are scheduled to resume.

The appeal of city living has its benefits, but these locales typically have dense populations and an accumulation of pollution and trash.

Some cities in America are affected by this problem more than others, and a new survey takes a closer look at it.

House Fresh, an indoor air quality company, assembled a report ranking the dirtiest cities in the U.S.

To determine which city is the dirtiest, the team examined 12.3 million sanitation-related 311 complaints placed over the past year based on the number of reports made with populations of 100,000.

Baltimore ranked first as the dirtiest city in the U.S. with 47,295 sanitary-related complaints. Milwaukee claimed the top spot as the cleanest city, with only 309 complaints related to cleanliness conditions.

The team also assessed dirty cities by zip codes, and the 21213 zip code in Baltimore was number one with 89,391 sanitation-related complaints.

Moreover, the 77546 zip code in Houston claimed the top spot as the cleanest with only 19 complaints related to cleanliness issues in the area.