People move indoors, the air is colder, and there is a lot less sunlight.
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As a culture, Americans spend 90 percent of our time indoors, and in the majority of cases the air quality inside is far worse than it is outside.
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He ventured out for some fresh air after police lifted their order to stay indoors.
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If you were outdoors in air quality of that level, you'd be told to go indoors and not do any physical activity.
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The air pollution is so awful in her Salt Lake City suburb that Francis keeps her daughter indoors on many days to prevent her cough from being aggravated.
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