訓 あお ・ 音 セイ,ショウ 🔊
漢越音: thanh
The top part comes from 生 (to grow): the colour of fresh new plants, which is why it covers both blue and green.
Stroke data: KanjiVG (CC BY-SA 3.0) — kanjivg.tagaini.net
空が青いです。 (そらがあおいです)
The sky is blue.