Development of a Standardized Greenhouse Gas Quantification Template for the Philippine aviation industry

International aviation contributes 2.1% of global carbon emissions, with Philippine air transport emitting 0.712 million metric tonnes of CO₂e. In response, a greenhouse gas quantification template (GHGQT) was developed to enhance industry-wide emissions monitoring, using established methodologies from IPCC, WRI, and WBCSD, and other organizations. A readiness assessment identified regulatory gaps, inadequate data collection, and limited sustainability training. The GHGQT was applied to selected aviation companies to analyze Scope 1, 2, and 3 emissions. Results showed that PAL had the highest emissions due to large-scale operations, while Cebu Pacific led in Scope 3 emissions from wastewater discharge. The COVID-19 pandemic caused temporary reductions, reinforcing the importance of assessing GHG intensity rather than absolute emissions during disruptions. By providing a standardized approach, the GHGQT aims to improve emissions tracking, regulatory compliance, and sustainability efforts within the Philippine aviation industry.