These are the five dirtiest cities in the U.S.

The five dirtiest cities in the country have one thing in common: they are all governed by Democratic mayors. This was revealed by a new study conducted by LawnStarter. The ranking, which was conducted among the nation's 152 largest cities, measured each city's ranking based on four categories:

1. Pollution: air quality and greenhouse gas emissions.

2. Living conditions: percentage of people living in poor housing conditions (with mold or rats).

3. Infrastructure: waste production, regulation, and disposal.

4. Consumer satisfaction: the percentage of residents who find the city dirty.

Houston (Texas), followed by Newark (New Jersey), San Bernardino (California), Detroit (Michigan), and Jersey City (New Jersey) topped the list this year.

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Houston, Mayor Sylvester Turner (D)

Houston, governed by Democratic Mayor Sylvester Turner, ranked first in the overall ranking of the dirtiest cities.

The Space City ranked third in the nation in pollution; fourth in poor living conditions; 12th in infrastructure; and 34th in consumer satisfaction.

The city has the biggest cockroach problem, according to the study, citing U.S. Census Bureau data.

Newark, Mayor Ras Baraka (D)

Newark, led by Democratic Mayor Ras Baraka, ranked second as the dirtiest city. In terms of pollution, the city ranks 14th.

The Gateway City took third place for worst consumer satisfaction and fifth place for poor living conditions.

San Bernardino, Helen Tran (D)

San Bernardino, which is under the leadership of Democratic Mayor Helen Tran, is now the third dirtiest city in the country.

The Friendly City ranked first for worst pollution and worst consumer satisfaction. In terms of poor living conditions, the city ranks 56th on the list.

Detroit, Mike Duggan (D)

The fourth dirtiest city in the country is Detroit, led by Democratic Mayor Mike Duggan. The city remains in fourth place for worst consumer satisfaction and ninth for pollution.

In terms of poor living conditions, The Motor City ranked 35th on the list and 89th for infrastructure.

Jersey City, Steven Fulop (D)

Jersey City, governed by Democratic Mayor Steven Fulop, currently ranks as the fifth dirtiest city in the country.

Chilltown ranked second in poor living conditions and 15th in consumer satisfaction. In pollution, the city ranks 50th in the world.

The cleanest city, governed by Robert Dyer (R)

In contrast to the dirtiest cities, the ranking put Virginia Beach (Virginia), led by Republican Mayor Robert Dyer, in first place for the cleanest city in the country.

The Resort City ranked 149th in pollution and 132nd in consumer satisfaction. "For the second year in a row, Virginia Beach eclipses all other cities in our rankings," the study declared.