Some time in the late 1940s, a very patient, elderly beaver called Geronimo was put in a box, flown to an altitude of between 150 and 200 metres, and tossed out the side of an aeroplane.
The latter, at least, is probably forest fires - the friend who pointed me to this map works in KL and they had a reading of 380 a few days ago - he said you could taste the air.