1. Quality of current PM emission inventories
Kristin Rypdal, Chair of Task Force on Emission Inventories and Projections

2. Overview
Information about progress of the Task Force on Emission Inventories and Projections since last May
Address specific questions asked by the co-chairs
Are PM emission inventories robust?
What are the most important uncertainties?
How might PM emission inventories be improved?

3. Are PM emissions inventories robust?
Reported PM inventories are underestimated
Few Parties are reporting time-series and sector data for TSP, PM10 and PM2.5
Inventories are often not complete with respect to sources included
Emission inventory methodologies have not been developed or described for all sources
Large uncertainties in some emission factors
Fugitive sources are weakly characterised

4. What are the important uncertainties in PM emissions inventories?
Generally PM2.5 is less uncertain than larger fractions
Because fugitive sources are less important
Really large uncertainties
Fugitive sources and new sources (often poorly characterised)
Priorities identified by TFEIP for emission factor/guidance
Small-scale and industrial combustion
Processes in iron and steel industries
Off-road sources
Residential waste combustion
Burning of agricultural residues
Some ”new sources”

5. What are the important uncertainties in PM emissions inventories?
Activity data can also be uncertain:
Residential wood consumption and small-scale burning more uncertain than fossil fuel combustion.
Activity data to estimate fugitive sources can be unavailable
Chemical and size speciation
Is addressed by the PM Task group
Slow progress due to little funding
Try to build on existing and future projects

6. How might PM emissions inventories be improved?
Development of better guidance
The EU Commission will probably soon launch a contract to improve guidance (development of the Emission Inventory Guidebook) and datasets
Strengthening of reporting requirements
Not possible until there is a Protocol
Invites this expert group to provide input to the Revisions of the Emission reporting guidelines next year
Focus in the review process
Review of PM inventories will be prioritised in 2006
Parties will receive direct feedback on their reporting

7. How might PM emissions inventories be improved?
Higher priorities in the inventory agencies
A protocol or EU directive will probably help
Large recalculations of historical data are anticipated in the development phase
Uncertainties can be reduced, but improvements can take time!