What characteristics does the clear sky reflect?

Sunny weather, good air quality and high visibility.

1. Sunny weather: A clear sky means that there are fewer clouds in the sky, and there are no cloudy days or rainy days, which means that the weather is sunny and sunny.

2. Good air quality: A clear sky means that there are fewer pollutants or suspended substances in the air, and good air quality means fresh air and broad vision.

3. High visibility: A clear sky means that there are fewer clouds in the sky and the line of sight is unobstructed, so that people can clearly see mountains, buildings, planes and so on in the distance.