Gas generated as a secondary product from a primary process, often considered waste but can have value.

उपउत्पाद गैस

English Usage: The manufacturing plant produced a significant amount of byproduct gas during the operation.

Hindi Usage: निर्माण संयंत्र के संचालन के दौरान काफी मात्रा में उपउत्पाद गैस उत्पन्न हुई।