Pollen studies in a hospital air-conditioned room.

Pollen slides were exposed daily for a week at the height of the ragweed season for 2 successive years. They were placed in a hospital air-conditioned room, an adjacent room which was not air-conditioned, and outdoors on the roof of an office building in downtown Providence, R.I. The air-conditioning apparatus was quite successful in removing pollen and mold spores from the room with much lower counts than from non air-conditioned rooms. Even in the non air-conditioned room the quantity of pollen and spores was drastically lower than those found outside, suggesting that clinical improvement should occur by simply being indoors. Pollen trapped in a room may stay there for some time beyond its usual outdoor season.