Does Air Pollution Alter Lunar Eclipses?

It’s been a month since skywatchers in the Eastern Hemisphere were treated to the longest, deepest total lunar eclipse in decades. Many observers carefully monitored the Moon’s darkness as it coursed through the center of the umbra — the darkest part of our planet’s shadow. It’s been realized for years that the amount of cloudiness along Earth’s limb can affect the darkness of the umbra. But could the umbra’s darkness be accentuated by pollution in our atmosphere?

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