what "about" on rainy days?

[sitifan]

In addition to asking: do solar panels work on a cloudy day, what about on rainy days? Much that has been said about cloudy weather also applies to rainy days. The one big difference is that rain can actually be very beneficial for your energy output! The rain washes and cleans the dust, pollen and leaves off your panels. This in turn greatly improving efficiency when the sun shines again. Clean panels turn out the most electricity!

https://renewableenergysolar.net/do-solar-panels-work-on-a-cloudy-day/

In the above passage, is "about" a preposition?

 

[Rover_KE]

It's futile to separate the words of the idiom 'what about'.

what about

what plans or ideas do you have concerning (the person or thing mentioned)?

What about the money you hid away? (= What plans do you have for the money you hid away?)

(Random House)

 

[SoothingDave]

Is there someone out there who thinks rainy days aren't cloudy?