What does this ranked list of 5 US cities mean?

[AviatorTom]

Here's a list of 5 US cities, ranked according to some criteria.

1 - San Bernardino, California
2 - Los Angeles, California
3 - Detroit, Michigan
4 - Reading, Pennsylvania
5 - Ontario, California

Any idea what this list of cities represents?

Please voice an opinion.

Correct answer will be given tomorrow, Friday.

Updates

4 h

This is a list of the dirtiest cities in the United States, as determined by a lawncare company. So give them some leeway.

[OlderAndWiser]

Highest democrats percentage of registered voters?

[LC75LC71]

1. Lame. 2. Wonderful mixed with bums. 3. Blighted. 4. Never been there. 5. What about Ontario Ohio?

[OneViewpoint]

That's a list of the USA's dirtiest cities.

[Paige2006]

The dirtiest cities

[_Jenny_]

@AviatorTom sanctuary cities?

[AviatorTom]

Interesting guess, but that's not it

[_Jenny_]

@AviatorTom I’m done ✔️

[exitseven]

Cities on the verge of bankruotcy

[KostasKouvalis]

Top 5 cities where Whites are a minority?

[KostasKouvalis]

I found it, and I'm kicking myself for not guessing that