**T** = key source by Trend **L** = key source by Level ^ Methods || ^ D | Default | ^ T1 | Tier 1 / Simple Methodology * | ^ T2 | Tier 2* | ^ T3 | Tier 3 / Detailed Methodology * | ^ C | CORINAIR | ^ CS | Country Specific | ^ M | Model | | * as described in the EMEP/EEA Emission Inventory Guidebook - 2019, in the group specific chapters. || ^ AD - Data Source for Activity Data || ^ NS | National Statistics | ^ RS | Regional Statistics | ^ IS | International Statistics | ^ PS | Plant Specific data | ^ As | Associations, business organisations | ^ Q | specific Questionnaires (or surveys) | ^ M | Model / Modelled | ^ C | Confidential | ^ EF - Emission Factors || ^ D | Default (EMEP Guidebook) | ^ C | Confidential | ^ CS | Country Specific | ^ PS | Plant Specific data | ^ M | Model / Modelled |