That seems to be the predominant color in Beijing. In the almost 4 weeks that we've been here, we've woken up to grey skies most days. The number of days that I've actually seen clear blue skies can be counted on the fingers of one hand.
Driving into the city on the highway, one sees a shroud of grey haze enveloping the cityscape. Even the trees are grey. The "evergreens" are a sickly dark greyish green in color.
I don't remember the winters in Pennsylvania being so grey. I recall blues & greens even in the dead of winter.
It's like everything is waiting for Mother Nature's magic wand to wave away the dreary greyness, & breathe life & color into everything again.
I await with bated breath.