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People with severe chemical sensitivity may not be able to walk into older buildings, stores that stock strongly-scented products or structures with new carpets and paint.

I wouldn’t describe this as “I have a sensitive nose and skin,” but more as an extreme chemical sensitivity.

The people who suffer the most from fragrances are those with multiple chemical sensitivity, or MCS.

“Fragrances rank high among the chemical exposures I find problematic,” said Alison Johnson, who has MCS and founded the Chemical Sensitivity Foundation.

Over the course of several years, he experimented with the chemical sensitivity of various types of color film and the wavelengths of visible light coming through telescopes, and eventually produced this spectacular image of the Andromeda Galaxy, 2.5 million light years from Earth.