Blue sky returns to Minnesota Monday, air quality alert starts Tuesday. ... The Land of Sky Blue Waters is back. ... Ground-level ozone is expected to be high during the afternoon hours on Tuesday ...

Forecasters warn that hazy, grayish-blue skies could persist for many weeks as fires continue to burn, though most smoke will remain high in the atmosphere.

The sky is less blue. Even the cumulus clouds are a little harder to see in the sky so that’s the difference when you look up.” Saharan Dust helps scattered and refract the sunlight.

So the sky isn’t blue, at least not always. It is a glow-in-the-dark night sky too, colored a mix of green, yellow, and red. Its colors result from scattered sunlight, oxygen, and sodium from ...