Hot air balloon sea level, and humidity of the air surrounding. On a warm day, a balloon cannot lift as much as on a cool day, because the temperature required for launch will exceed the maximum sustainable for nylon envelope fabric. Also, in the lower atmosphere, the lift provided by a hot air balloon decreases about 3% for each 1,000 meters (1% per 1,000 ft) of altitude gained. Standard hot air balloons are known as Montgolfier balloons and rely solely on the buoyancy of hot air provided by the burner and contained by the envelope. This style of balloon was developed by the
2012 Carterton hot air balloon crash standards in the industry, commenting on the "lack of enforcement" for mandatory drug and alcohol tests. 2012 Carterton hot air balloon crash On 7 January 2012, a scenic hot air balloon flight from Carterton, New Zealand, collided with a high-voltage power line while attempting to land, causing it to catch fire, disintegrate and crash just north of the town, killing all eleven people (ten passengers and the pilot) on board. An inquiry into the accident by the Transport Accident Investigation Commission (TAIC) concluded that the balloon pilot made an error of judgement when contact with the power lines became imminent,