Question

what is the permissible limit of methane in underground mines​

Answer 1

Explanation:

Monitoring Methane Levels in Mines Monitors are required to provide alerts when levels exceed 1%. As levels can rise and fall rapidly, and the reaction times of personnel are critical, there is a warning at 1% rather than the dangerous level of 5% to ensure an adequate and timely response.

Answer 2

$\huge\mathcal\blue{Hello!!!}$

$\huge\mathbf\purple{Answer:-}$

$\huge\mathbb\black{About 1 percent only}$

$\huge\mathcal\pink{Hope it helps!!!}$