The Indoor Air Pollutants Inventory Tool (InAPI) v1.0

The InAPI tool was developed within Work Package 1 (WP1) of the IAQ-EMS project to create a comprehensive inventory of indoor air pollutants in the UK. Based on a literature review and field measurements, the tool catalogues data across four key areas of the IAQ-EMS framework—organizing information by pollutant, environment, and activity. InAPI also identified chemical and biological emission sources, surveyed occupant behaviour and environmental parameters, and built a flexible database representing indoor environments commonly experienced by the UK population. The main goal of the InAPI tool is to provide a clear overview of indoor air pollution levels in the UK, highlighting average pollutant concentrations in key public and private indoor spaces. It also quantifies major indoor emission sources for the first time using a chemical mass balance approach. InAPI aims to make relevant literature easily accessible, offering a valuable resource for model developers, researchers, and policymakers working to understand and manage indoor air quality.