It's dark, isn't it?

It's getting dark No. This sentence may be inaccurate. It won't get dark, but the alternation of day and night makes the sky look different. Usually the color of the sky will gradually darken at dusk, and it will be completely black at night. But if you are referring to some natural disasters, such as sandstorms and forest fires, these phenomena may cause the sky to become dark or present other abnormal situations.