Awọn bugbamu waye laarin awọn aala kan, pataki laarin awọn ibẹjadi ifilelẹ.
Awọn ibẹjadi ifilelẹ lọ fun CH4 ni air ibiti o lati 5% si 15% ifọkansi methane. Bugbamu yoo waye ti iwọn iwọn methane ba ṣubu laarin eyi 5% si 15% ibiti o wa si olubasọrọ pẹlu ina ti o ṣii.