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What might stick out is the distinct color on the fire hydrant's front steamer port: either light blue, green, orange or red. As you could've guessed, the colors mean something.

Blue and violet light is scattered more strongly than red and orange light—this is also why the sky looks blue during the day.

For example, red and orange light have longer wavelengths while blue and violet light have shorter wavelengths. Light also interacts with particles and gas molecules in the air and our atmosphere.

When you add in dust or dirt particles it causes the light to be scattered even more, really given the sky (and sun) the red/orange look.

Have you ever looked up at the sky and wondered why it’s blue during the day, but glows orange or red during a sunset? It’s one of those everyday wonders we often take for granted. The answer ...

Blue light may contribute to headaches, but it's likely that other factors, like eye strain from staring at a screen for too long, may also be involved.