Natural Gas Enterprise Act Article 19

The natural gas supplied by natural gas enterprises shall comply with national standards.natural gas utility enterprises supplying natural gas to users shall add sufficient odorants recognizable by humans. The types and concentrations of the added odorants shall be regularly submitted to the competent authority of the municipality or county (city) for reference.The reporting format, variety, concentrations, and the reporting deadline stated in the preceding paragraph shall be announced by the central competent authority.
中文原文 天然氣事業法第19條
天然氣事業供應之天然氣,應符合國家標準。
公用天然氣事業供應用戶之天然氣,應加入足資人類嗅辨之嗅劑;其添加之嗅劑種類及濃度,應定期提報直轄市、縣(市)主管機關備查。
前項嗅劑之提報格式、種類、濃度及期限,由中央主管機關公告之。

English translation for reference only; the Chinese text prevails. Not legal advice.