關於「Town gas composition」標籤，搜尋引擎有相關的訊息討論：

Gas Production - Towngaswww.towngas.com › About-Us › Hong-Kong-Gas-BusinessNatural Gas VS Town Gas | Nebula Engineering Pte Ltdnepl.com.sg › natural-gas-vs-town-gasEMSD : Types of Domestic Fuel Gases and Their Properties (246)www.emsd.gov.hk › gas_safety › gas_safety_tips_to_us