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1 .This is Scientific American 60-Second Science. I'm Sophie Bushwick. Got a minute?
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2 .A volcanic eruption hurls ash particles and gas high into the sky.
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3 .Once airborne, these substances circle the globe, scattering sunlight more and giving sunsets a redder color.
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4 .The effect only lasts for a few years, but paintings by gifted artists can preserve it for centuries.
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5 .And give us clues about past air quality.
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6 .Between the years 1500 and 2000, some 50 major volcanic eruptions occurred all over the world.
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7 .Meanwhile, artists painted thousands of sunsets.
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8 .To see if such paintings could reveal atmospheric info, researchers analyzed high-quality digital photos of the art for the balance of red and green colors along the horizon.
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9 .Based on the red-green ratio, they calculated the amount of particles in the atmosphere.
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10 .These numbers indeed corresponded with recent volcanic eruptions.
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11 .And they also reflected an increase in airborne particles after the industrial revolution.
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12 .The research is in the journal Atmospheric Chemistry and Physics.
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13 .For much of human history, we had no instruments to measure air quality.
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14 .But this study shows that great painters may shed light on past pollution.
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15 .Thanks for the minute, for Scientific American 60-Second Science. I'm Sophie Bushwick.
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