That no contaminant gets in (air) and that the heating is not so excessive it causes accidents.
They have bad air, bad smells, lots of crashes, disorganised police, disorganised parking lots ( which often causes car accidents ). Bangladesh have lots in common... except the population.
These are accidents that happen with aircraft.
Air Accidents Investigation Branch was created in 1915.
nothing
The rain-shadow effect causes some air and some wind and some rain to move from place to place.
you
people smoking and factories
sorry I mean Lion Air
1500 hot air balloon accidents happen a year in the United States. There are many safety precautions that can be taken to avoid these accidents, however.
Here are some air-borne diseases:the common coldinfluenzapneumoniatuberculosislegiollenosis
On average, there are around 20 hot air balloon accidents reported worldwide each year. These accidents can vary in severity, from minor incidents to more serious crashes. Accidents are relatively rare considering the number of hot air balloon flights conducted each year.