Photoshop thinks green is blue

You're looking at 'aerial perspective' here, [https://en.wikipedia.org/wiki/Aerial_perspective] the atmosphere is what causes those 'blue' and distant hills and gives an image depth. 

That's a pretty natural looking image.

In my days as a pro photographer we used to use a 1A or a UV filter on the lens to cut that haze a little.

Whilst you could select those hills and make the blue tinted foliage more green (and perhaps add sharpness) the result would lose it's "depth" of perspective. 

IF you can get Photoshop's Hue/Saturation adjustment tool to select only the hills you'll be able to swing the hue a bit, it's probably that the colour need shifting as much as being increased in saturation.

Why not try this tutorial: removing distance haze in photoshop

I hope this helps

thanks
neil barstow, colourmanagement.net :: adobe forum volunteer
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It's not that Photoshop thinks green is blue. It's that you think blue is green. You need to work with that.

If you select/mask the background you can do anything you want with it. For a quick "magic button" solution, there is the dehaze slider in the ACR filter. You will probably still have to mask.

Hi use curve and image adjustments there are many helping options....regards....this is know as color correction