UK Emissions Data

1

• UK Emissions Data
• CITY-DELTA, Vienna Workshop
• 24-25 June 2002

2
Presentation Overview

• Context
• Methodology
• Limitations
• Experiences
• Data outputs

3
Context

• The UKs National Atmospheric Emissions Inventory
• Work Done by AEA Technology for 15 years
• On behalf of UK Government

4
Methodology
National Reporting
Point Sources
UK Inventory National trends Projections Point
sources Emission maps
National Modelling
Central Statistics
Policy Support
Emission Factors
Local Support
Local/Regional Data
Public Information
5
NAEI links
6
Why not local inventories?

• NAEI ? National Scale
• London Inventory used?
• . . . . . Geographic area
• Time scales
• Consistency
• Regularly updated

7
Methodology

• Spatial Emissions Mapping
• Pollutant Speciation
• Temporal Emission Trends

8
Spatial Emissions Data

• 1x1 km resolution for UK
• 22 Pollutants
• Resource for many private and public
  organisations

9
Mapping category

• Point sources
• Area sources
• Mobile sources

10
Mapping Point source data

• Large industry sectors
• Accurate geographic locations
• Data provision by industry / E Agency
• Consistency with NAEI

11
Mapping Area source data

• Surrogate data sets needed
• UK totals (e.g. SO2) distributed
• Domestic, agriculture, and commercial

12
Mapping Mobile source data

• Based on road network coverage
• Road link information
• - flows (vkm) by
• vehicle
• - length of link
• - average speeds

13
Spatial Aggregation
Points (Power Stations)
Area (Domestic)
Mobile (Transport)
14
Aggregating 1x1 Spatial Emissions
10x10 km Spatial Emissions
1x1 km Spatial Emissions
15
VOC Speciation

• 1999 Inventory provided
• 86 emissions profiles
• 250 source sectors
• 576 individual or groups of VOCs
• Report on www.airquality.co.uk

16
VOC Speciation - Sources
17
VOC Speciation - Example
18
VOC Speciation - Vehicle Refinishing
19
Temporal Trends

• Factors supplied
• Month of year
• Day of the week
• Hour of the day
• Non-sector specific
• Uniform in spatial terms

20
Temporal Trends - VOCs
21
Temporal Trends - Daily NOx
22
Temporal Trends - day / month
23
Limitations of data provided

• Important to recognise data limitations
• Spatial emissions
• Speciation
• Temporal data

24
Limitations of emissions data

• Spatial distribution uncertainties - use of
  surrogate data
• . . . . but continual development.
• Data sets at UK scale
• Grid cell resolution

25
Limitations of Speciation / Temporal data

• Assumptions about profiles
• . . . . but continual development
• Highly aggregated data
• Lack of specific spatial information

26
Experiences

• Focus on experience of providing data
• Web site information
• Time scales

27
Data Dissemination
www.naei.org.uk
28
Web resources

• Historical and projected emissions
• Emission factors
• Spatial emissions data sets
• Online helpdesk
• Report (www.airquality.co.uk)

29
1x1 km NOx Emissions
30
1x1 km PM10 Emissions
31
1x1 km SO2 Emissions