If you’re particularly fragile, then you feel heat as more hot or things like that. Or, if it’s more humid, then everybody feel heat differently. There’s two different numbers. One is listed, one is felt. They applied the same to air pollution and remind people who are more sensitive to say, “Currently, even though PM 2.5 is at this many micrograms/milligrams, you will feel it as double, the milligrams.”

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