Introduction

Introduction

The NAEI reports estimates of the UK emissions of a number of gaseous pollutants. Estimates are calculated for each source category based on its fuel consumption or other activity statistics. These are then summed to obtain a total emission for the UK. This Appendix describes the methodology used to estimate the emissions and is laid out according to source category. The inventory is revised on an annual basis and the methodology described here is that of the 1999 Inventory. All revisions are applied to the full time series back to the earliest year, 1970. The pollutants discussed here are given in Table A1 below.

Table A1 Pollutants Discussed

Pollutant Species

Carbon dioxide as expressed as carbon (CO₂ as C)

NOx as nitrogen dioxide (NO_x as NO₂)

SO_X as sulphur dioxide (SO_x as SO₂)

Methane (CH₄)

Non-methane volatile organic compounds (NMVOC)

carbon monoxide (CO)

nitrous oxide (N₂O)

black smoke (BS)

Particulate Matter less than 10 mm (PM₁₀)

Ammonia (NH₃)

The methodology used for the estimation of NH₃ emissions is centred on different sectors to many of the other pollutants, which are dominated by fuel combustion emissions. Consequently the methodology for NH₃ has been presented in a self-contained section, rather than the framework that is common to many of the other pollutants.