But plenty of people’s moods were affected. In Colorado, where hiking and biking are deeply embedded in state culture, residents regard fresh air the way New Yorkers regard coffee: They need it daily, or they get grumpy. Dave Gillespie, 48, a bike mechanic in the Denver suburb of Littleton, said he was thrilled to see the smoke go. Mr. Gillespie is asthmatic and an avid cyclist, and he had been driving to work this week — something he hates — instead of commuting by bicycle.