the smog was indistinguishable from the sea

[Klpno]

Hello, everyone.
I'd like to ask what does the phrase 'sky faded until the smog was indistinguishable from the sea' mean in the following passage?

It was that week between Christmas and New Year’s, a time to pay end-of-year quarterly taxes, and polish off gingerbread men and eggnog while making resolutions about sugar, carbs and alcohol. The L.A. sky faded until the smog was indistinguishable from the sea.

Does it mean that the color of sky became like the one of sea water?

[Diverhank]

"Does it mean that the color of sky became like the one of sea water?"

Yes. The air in LA is famous for being smoggy - a brownish haze. When the sun starts to go down, the sky and the sea blend together

[Klpno]

Thank you very much, diverbank.