Booms in the stratosphere.
D000397:Air Pollution / Q000517:prevention & control*; D000401:Aircraft; D004782:Environmental Health; D005380:Financing, Government; D009622:Noise / Q000517:prevention & control; D010126:Ozone; D013227:Steam; D013458:Sulfur Dioxide; D014481:United States
D013227:Steam; D013458:Sulfur Dioxide; D010126:Ozone