Williams, K R; Ciupek, K; Tompkins, J T; Brown, A S; Allerton, J J; Butterfield, D M; Kean, M N; Robins, C C; Schmeer, J L; Singh, G K; Tipler, J M; Tomson, M; Walker, D J W; Priestman, M D S; Tremper, A H; Ek, D E B; Green, D C (2025) Airborne Particle Concentrations, Particle Numbers and Black Carbon in the United Kingdom - Annual Report 2024. NPL Report. ENV 61

Tompkins, J T; Allerton, J J; Williams, K R; Butterfield, D M; Brown, A S (2025) Particle size comparison between TSI 3936 scanning mobility particle sizer and TSI 3938W50-CEN scanning mobility particle sizer conducted at NPL and London Marylebone Road monitoring sites. NPL Report. ENV 62

Williams, K R; Braysher, E C; Brown, A S; Brown, R J C; Butterfield, D M; Cheong, J H L; Robins, C C; Showman, Y A (2025) The UK Heavy Metals Monitoring Network: Annual Report 2024. NPL Report. ENV 60

Braysher, E C; Cheong, J H L; Butterfield, D M; Brown, A S; Brown, R J C (2025) Lead Isotope Ratio Measurements for Source Identification Using Samples from the UK Heavy Metals Air Quality Monitoring Network. Atmosphere, 16 (3). 283

Williams, K R; Braysher, E C; Cheong, J H L; Robins, C C; Kantilal, V; Butterfield, D M; Lilley, A; Bradshaw, C; Brown, A S; Brown, R J C (2024) Annual Report for 2023 on the UK Heavy Metals Monitoring Network. NPL Report. ENV 55

Brown, A S; Barker, S J; Brown, R J C; Wyche, K P; Butterfield, D M (2024) A robust regression analysis method to determine the significance of trends concentrations of heavy metals in UK ambient air and improve network design and emissions inventories. Environmental Monitoring and Assessment, 196. 101

Williams, K R; Braysher, E C; Cheong, J H L; Robins, C C; Kantilal, V; Butterfield, D M; Lilley, A; Bradshaw, C; Brown, A S; Brown, R J C (2023) Annual Report for 2022 on the UK Heavy Metals Monitoring Network. NPL Report. ENV 51

Littlefair, J E; Allerton, J J; Brown, A S; Butterfield, D M; Robins, C; Economou, C K; Garrett, N R; Clare, E L (2023) Air-quality networks collect environmental DNA with the potential to measure biodiversity at continental scales. Current Biology, 33 (11). pp. R426-R428.

Goddard, S L; Williams, K R; Brown, R J C; Butterfield, D M; Robins, C; Lilley, A; Bradshaw, C; Sweeney, B; Brown, A S; Sims, A (2023) Annual Report for 2020 on the UK Heavy Metals Monitoring Network. NPL Report. ENV 48

Williams, K R; Goddard, S L; Braysher, E C; Brown, R J C; Butterfield, D M; Robins, C; Lilley, A; Bradshaw, C; Sweeney, B; Brown, A S (2023) Annual report for 2021 on the UK Heavy Metals Monitoring Network. NPL Report. ENV 49

Brown, R J C; Goddard, S L; Williams, K R; Robins, C; Butterfield, D M; Brown, A S (2022) Falling nickel concentrations in ambient air in South Wales – 50 years of progress. Environmental Science: Processes & Impacts, 24 (10). pp. 1821-1829.

Butterfield, D M; Lipscombe, R P; Gardiner, T D (2020) Safe Sampling Volume determinations of 12 volatile organic compounds on Carboxen 1003, Carbopack-X & Tenax-TA. Journal of Chromatography A, 1626. 461369 ISSN 00219673

Goddard, S L; Brown, R J C; Butterfield, D M; McGhee, E A; Robins, C; Beccaceci, S; Lilley, A; Bradshaw, C; Haynes, E (2020) Annual Report for 2016 on the UK Heavy Metals Monitoring Network. NPL Report. ENV 31

Goddard, S L; Brown, R J C; Butterfield, D M; McGhee, E A; Robins, C; Williams, K; Lilley, A; Bradshaw, C; Sweeney, B; Brown, L (2020) Annual Report for 2018 on the UK Heavy Metals Monitoring Network. NPL Report. ENV 29

Goddard, S L; Brown, R J C; Butterfield, D M; Robins, C; Williams, K; Lilley, A; Bradshaw, C; Sweeney, B; Brown, L; Sims, A (2020) Annual Report for 2019 on the UK Heavy Metals Monitoring Network. NPL Report. ENV 30

Goddard, S L; Brown, R J C; Butterfield, D M; McGhee, E A; Robins, C; Williams, K; Lilley, A; Bradshaw, C; Haynes, E; Brown, L (2020) Annual report for 2017 on the UK Heavy Metals Monitoring Network. NPL Report. ENV 28

Goddard, S L; Williams, K R; Robins, C; Butterfield, D M; Brown, R J C (2019) Concentration trends of metals in ambient air in the UK: a review. Environmental Monitoring and Assessment, 191 (11). 683 ISSN 0167-6369

Brown, R J C; Beccaceci, S; Butterfield, D M; Quincey, P G; Harris, P M; Maggos, T; Panteliadis, P; John, A; Jedynska, A; Kuhlbusch, T A J; Putaud, J P; Karanasiou, A (2017) Standardisation of a European measurement method for organic carbon and elemental carbon in ambient air: results of the field trial campaign and the determination of a measurement uncertainty and working range. Enviornmental Science - Processes & Impacts, 19 (10). pp. 1249-1259.

Hessey, I; Butterfield, D M; Beccaceci, S; Quincey, P; Sweeney, B; Lilley, A; Bradshaw, C; Fuller, G*; Green, D*; Font Font, A (2017) 2016 Annual Report for the UK Black Carbon network. NPL Report. ENV 21

Butterfield, D M; Quincey, P (2017) An Investigation into the effects of off-shore shipping emissions on coastal black carbon concentrations. Aerosol Air Qual. Res., 17 (1). pp. 218-229.

Goddard, S L; Brown, R J C; Butterfield, D M; McGhee, E A; Robins, C; Beccaceci, S; Lilley, A; Bradshaw, C; Haynes, E (2016) Annual report for 2015 on the UK Heavy Metals Monitoring Network. NPL Report. ENV 9

Boon, A*; Broquet, G*; Clifford, D J*; Chevallier, F*; Butterfield, D M; Pison, I*; Ramonet, M*; Paris, J D*; Ciais, P* (2016) Analysis of the potential of near-ground measurements of CO2 and CH4 in London, UK, for the monitoring of city-scale emissions using an atmospheric transport model. Atmos. Chem. Phys., 16 (11). pp. 6735-6756.

Beccaceci, S; Brown, R J C; Butterfield, D M; Harris, P M; Otjes, R P*; van Hoek, C*; Makkonen, U*; Catrambone, M*; Patier, R F*; Houtzager, M M G*; Putaud, J P* (2016) Standardisation of a European measurement method for the determination of anions and cations in PM2.5: results of field trial campaign and determination of measurement uncertainty. Environ. Sci. - Process. Impacts, 18 (12). pp. 1561-1571.

Brown, R J C; Butterfield, D M; Goddard, S L; Hussain, D; Quincey, P G; Fuller, G W* (2016) Wavelength dependent light absorption as a cost effective, real-time surrogate for ambient concentrations of polycyclic aromatic hydrocarbons. Atmos. Environ., 127. pp. 125-132.

Goddard, S L; Brown, R J C; Butterfield, D M; McGhee, E A; Robins, C; Brown, A S; Beccaceci, S; Lilley, A; Bradshaw, C; Brennan, S (2015) Annual report for 2014 on the UK Heavy Metals Monitoring Network. NPL Report. ENV 2

Goddard, S L; Brown, R J C; Butterfield, D M; McGhee, E; Robins, C; Brown, A S; Beccaceci, S; Whiteside, K J; Bradshaw, C; Brennan, S (2015) Annual report for 2013 on the UK Heavy Metals Network. NPL Report. ENV 1

Butterfield, D M; Beccaceci, S; Quincey, P; Sweeney, B P; Lilley, A; Bradshaw, C; Fuller, G*; Green, D*; Font Font, A* (2015) 2014 annual report for the UK black carbon network. NPL Report. AS 97

Beccaceci, S; McGhee, E; Robins, C; Butterfield, D M; Tompkins, J; Quincey, P G; Brown, R J C; Brennan, S; Green, D*; Tremper, A*; Priestman, M*; Font Font, A* (2015) Airborne particulate concentrations and numbers in the United Kingdom (phase 3), annual report 2014. NPL Report. ENV 6

Butterfield, D M; Beccaceci, S; Harris, P M (2015) Statistical analysis of Organic Carbon (OC), Elemental Carbon (EC) & Total Carbon (TC) concentrations collected on filters from field validation exercise. NPL Report. AS 96

Butterfield, D M; Gardiner, T D (2015) Determining the temporal variability in atmospheric temperature profiles measured using radiosondes and assessment of correction factors for different launch schedules. Atmos. Meas. Tech., 8 (1). pp. 463-470.

Brown, R J C; Goddard, S L; Butterfield, D M; Brown, A S; Robins, C; Mustoe, C L; McGhee, E A (2015) Ten years of mercury measurement at urban and industrial air quality monitoring stations in the UK. Atmos. Environ., 109. pp. 1-8.

Beccaceci, S; McGhee, E; Robins, C; Tompkins, J; Quincey, P; Brown, R J C; Butterfield, D M; Green, D*; Tremper, A*; Priestman, M*; Font Font, A*; Jones, A* (2014) Airborne particulate concentrations and numbers in the United Kingdom (phase 3). Annual report 2013. NPL Report. AS 93

Fuller, G W*; Tremper, A H*; Baker, T D*; Yttri, K E*; Butterfield, D M (2014) Contribution of wood burning to PM10 in London. Atmos. Environ., 87. pp. 87-94.

Beccaceci, S; Mustoe, C L; Butterfield, D M; Tompkins, J; Sarantaridis, D; Quincey, P; Brown, R J C; Green, D*; Fuller, G*; Tremper, A*; Font Font, A*; Jones, A* (2013) Airborne Particulate Concentrations and Numbers in the United Kingdom (phase 3). Annual report 2012. NPL Report. AS 83

Butterfield, D M; Beccaceci, S; Quincey, P; Sweeney, B P; Whiteside, K; Fuller, G*; Green, D*; Font Font, A* (2013) 2012 annual report for the UK black carbon network. NPL Report. AS 78

Beccaceci, S; Mustoe, C L; Butterfield, D M; Tompkins, J; Sarantaridis, D; Quincey, P; Brown, R J C; Green, D*; Grieve, A*; Jones, A* (2013) Airborne particulate concentrations and numbers in the United Kingdom (phase 3). Annual report 2011. NPL Report. AS 74

Quincey, P; Beccaceci, S; Butterfield, D M; Sarantaridis, D*; Tompkins, J (2013) Aerosol metrology supporting air quality monitoring in the United Kingdom and Europe. MAPAN, J. Metrol. Soc. India, 28 (3). pp. 145-152.

Coleman, M D; Robinson, R A; Williams, M B*; Clack, M J; Butterfield, D M (2013) State of UK emissions monitoring of stacks and flues: an evaluation of proficiency testing data for SO2, NO and particulates. Accred. Qual. Assur., 18 (6). pp. 517-524.

Brown, A S; Brown, R J C; Coleman, P J*; Conolly, C*; Sweetman, A J*; Jones, K C*; Butterfield, D M; Sarantaridis, D; Donovan, B J*; Roberts, I* (2013) Twenty years of measurement of polycyclic aromatic hydrocarbons (PAHs) in UK ambient air by nationwide air quality networks. Environ. Sci. - Process. Impacts, 15 (6). pp. 1199-1215.

Butterfield, D M; Beccaceci, S; Quincey, P; Sweeney, B P; Whiteside, K; Fuller, G*; Green, D*; Grieve, A* (2012) 2011 annual report for the UK black carbon network. NPL Report. AS 70

Brown, A S; Sarantaridis, D; Butterfield, D M; Brown, R J C; Whiteside, K J; Hughey, P; Goddard, S L; Hussain, D; Williams, M (2012) Annual Report for 2011 on the UK PAH Monitoring and Analysis Network. NPL Report. AS 71

Brown, R J C; Butterfield, D M; Goddard, S L; Mustoe, C L; Robins, C; Brown, A S; Beccaceci, S; Whiteside, K J; Williams, M (2012) Annual report for 2011 on the UK Heavy Metals Monitoring Network. NPL Report. AS 69

Butterfield, D M; Brown, R J C (2012) Polycyclic aromatic hydrocarbons in Northern Ireland. NPL Report. AS 66

Sweeney, B P; Butterfield, D M (2012) Site suitability assessment of proposed black carbon network sites. NPL Report. AS 67

Butterfield, D M; Beccaceci, S; Sweeney, B P; Williams, M; Fuller, G*; Green, D*; Grieve, A* (2011) 2010 Annual Report for the UK Black Carbon Network. NPL Report. AS 63

Brown, A S; Butterfield, D M; Brown, R J C; Hughey, P; Whiteside, K; Goddard, S L; Williams, M (2011) Annual Report for 2010 on the UK PAH Monitoring and Analysis Network. NPL Report. AS 62

Beccaceci, S; Muhunthan, D; Sarantaridis, D; Tompkins, J; Butterfield, D M; Quincey, P; Brown, R J C; Green, D*; Grieve, A*; Fuller, G*; Jones, A* (2011) CPEA 28: Airborne particulate concentrations and numbers in the United Kingdom (phase 2). NPL Report. AS 65

Brown, R J C; Butterfield, D M; Goddard, S L; Muhunthan, D; Robins, C; Brown, A S; Beccaceci, S; Williams, M (2011) Report to the Department of Environment, Food and Rural Affairs, the Welsh Government, the Department of the Environment in Northern Ireland, and the Scottish Government, by the National Physical Laboratory: Annual report for 2010 on the UK Heavy Metals Monitoring Network. NPL Report. AS 61

Quincey, P G; Butterfield, D M; Green, D*; Fuller, G W* (2011) Black smoke and black carbon: further investigation of the relationship between these ambient air metrics. Atmos. Environ., 45 (21). pp. 3528-3534.

Beccaceci, S; Muhunthan, D; Butterfield, D M; Gilham, R; Tompkins, J; Sweeney, B; Brown, R J C; Quincey, P; Green, D*; Alexander, J*; Grieve, A* (2010) CPEA 28: Airborne particulate concentrations and numbers in the United Kingdom (phase 2) 2009 annual audit report. NPL Report. AS 51

Butterfield, D M; Green, D*; Alexander, J*; Grieve, A* (2010) 2009 annual report for the UK Black Carbon Network. NPL Report. AS 52

Butterfield, D M; Whiteside, K; Hughey, P; Quincey, P (2010) UK Non-Automatic Hydrocarbon Network: Annual Report for 2009. NPL Report. AS 50

Brown, R J C; Butterfield, D M; Goddard, S L; Muhunthan, D; Brown, A S; Beccaceci, S; Williams, M (2010) Annual Report for 2009 on the UK Heavy Metals Monitoring Network. NPL Report. AS 49

Beccaceci, S; Butterfield, D M; Hayman, G; Muhunthan, D; Quincey, P; Sweeney, B P; Alexander, J*; Green, D* (2009) CPEA 28: Airborne particulate concentrations and numbers in the United Kingdom (phase 2) annual Report - 2008. NPL Report. AS 46

Butterfield, D M; Beccaceci, S; Hughey, P; Green, D*; Alexander, J* (2009) 2008 Annual Report for the UK Black Smoke Network. NPL Report. AS 37

Butterfield, D M; Quincey, P (2009) Summary of measurements of black smoke, black carbon and elemental carbon performed by DEFRA networks. NPL Report. AS 39

Quincey, P G; Butterfield, D M (2009) A study on the effects of humidity on the mass of UK PM samples. NPL Report. AS 40

Brown, R J C; Butterfield, D M; Goddard, S L; Muhunthan, D; Brown, A S; Williams, M (2009) Annual Report for 2008 on the UK Heavy Metals Monitoring Network. NPL Report. AS 34

Quincey, P G; Butterfield, D M (2009) Ambient air particulate matter PM10 and PM2.5: developments in European measurement methods and legislation. Biomarkers, 14 (Suppl.). pp. 34-38.

Hayman, G; Yardley, R E; Quincey, P; Butterfield, D M; Green, D*; Alexander, J*; Johnson, P*; Tremper, A* (2008) CPEA 28: Airborne Particulate Concentrations and Numbers in the United Kingdom (phase 2): Annual Report - 2007. NPL Report. AS 25

Butterfield, D M; Yardley, R E; Hughey, P; Lipscombe, R (2008) 2007 annual report for the UK Black Smoke Network. NPL Report. AS 22

Butterfield, D M; Whiteside, K; Quincey, P G (2008) UK Non-Automatic Hydrocarbon Network. Annual report for 2007. NPL Report. AS 23

Brown, R J C; Butterfield, D M; Goddard, S L; Muhunthan, D; Williams, M; Yardley, R E (2008) Annual Report for 2007 on the UK Heavy Metals Monitoring Network. NPL Report. AS 20

Muhunthan, D; Yardley, R E; Butterfield, D M (2008) Report on the organic carbon/elemental carbon (OC/EC) and anion analysis of filter PM samples from Auchencorth Moss. NPL Report. AS 21

Gilham, R J J; Spencer, S J; Butterfield, D M; Seah, M P; Quincey, P G (2008) On the applicability of XPS for quantitative total organic and elemental carbon analysis of airborne particulate matter. Atmos. Environ., 42 (16). pp. 3888-3891.

Brown, R J C; Yardley, R E; Muhunthan, D; Butterfield, D M; Williams, M; Woods, P T; Brown, A S; Goddard, S L (2008) Twenty-five years of nationwide ambient metals measurement in the United Kingdom: concentration levels and trends. Environ. Monit. Assess., 142 (1-3). pp. 127-140.

Yardley, R E; Butterfield, D M (2007) CPEA 28: airborne particulate concentrations and numbers in the United Kingdom (phase 2). Annual audit report. NPL Report. AS 16

Butterfield, D M; Robinson, R A (2007) Gaseous proficiency testing scheme for the STA. Round 3 final report. NPL Report. AS 14

Butterfield, D M; Quincey, P (2007) Measurement science issues relating to PM10 and PM2.5 airborne particles. NPL Report. AS 15

Butterfield, D M; Quincey, P; Yardley, R E; Hughey, P; Lipscombe, R (2007) 2006 Annual report for the UK Black Smoke Network. NPL Report. AS 2

Yardley, R E; Quincey, P; Butterfield, D M; Green, D*; Alexander, J*; Johnson, P*; Tremper, A* (2007) CPEA 28: Airborne particulate concentrations and numbers in the United Kindom (phase 2). NPL Report. AS 4

Butterfield, D M; Whiteside, K; Quincey, P (2007) UK Non-Automatic Hydrocarbon Network: annual report for 2006. NPL Report. AS 12

Yardley, R E; Sweeney, B P; Butterfield, D M; Quincey, P; Fuller, G*; Green, D* (2007) CPEA 28: airborne particulate concentrations and numbers in the United Kingdom (phase 2). Estimation of measurement uncertainty in network data. NPL Report. DQL-AS 037

Brown, R J C; Williams, M; Butterfield, D M; Yardley, R E; Muhunthan, D; Goddard, S L (2007) Report to the Department of Environment, Food and Rural Affairs by the National Physical Laboratory: annual report for 2006 on UK Heavy Metals Monitoring Network. NPL Report. DQL-AS 036

Butterfield, D M; Yardley, R E; Quincey, P G; Green, D* (2007) Comparison of methods for organic and elemental carbon PM10 concentrations at Marylebone Road for the period 07/09/06 to 31/12/06. NPL Report. DQL-AS 035

Quincey, P G; Butterfield, D M; D'Souza, H; Henderson, M (2007) Monitoring of ozone precursors in ambient air using pumped and diffusive sampling on the sorbent Carbopack X. Atmos. Environ., 41. pp. 7865-7873.

Butterfield, D M; Quincey, P (2006) A study of methods for reducing the effect of static charge when weighing filters. NPL Report. DQL-AS 033

Sweeney, B P; Yardley, R E; Butterfield, D M (2006) CPEA 28: airborne particulate concentrations and numbers in the United Kingdon (phase 2) - annual. NPL Report. DQL-AS 031

Yardley, R E; Quincey, P; Butterfield, D M; Williams, M; Green, D*; Johnson, P*; Tremper, A* (2006) CPEA 28: airborne particulate concentrations and numbers in the United Kingdon (phase 2). Annual report 2005. NPL Report. DQL-AS 028

Brown, R J C; Williams, M; Butterfield, D M; Yardley, R E; Muhunthan, D; Woods, P T (2006) Annual report for 2005 on the UK Heavy Metals Network. NPL Report. DQL-AS 026

Butterfield, D M; Whiteside, K; Quincey, P (2006) UK non-automatic hydrocarbon network: annual report for 2005. NPL Report. DQL-AS 027

Brown, A S; Yardley, R E; Quincey, P G; Butterfield, D M (2006) Studies of the effect of humidity and other factors on some different filter materials used for gavimetric measurements of ambient particulate matter. Atmos. Environ., 40. pp. 4670-4678.

Butterfield, D M (2005) UK Heavy Metals Network audit report for 2005. NPL Report. DQL-AS 021

Butterfield, D M; Sweeney, B P (2005) CPEA 28: airborne particulate concentrations and numbers in the United Kingdom (phase 2). State of network report. NPL Report. DQL-AS 019

Butterfield, D M; Whiteside, K; Quincey, P (2005) UK non-automatic hydrocarbon network: annual report for 2004. NPL Report. DQL-AS 016

Brown, A S; Yardley, R E; Quincey, P G; Butterfield, D M (2005) Ambient air particulate matter: quantifying errors in gravimetric measurements. NPL Report. DQL-AS 015

Butterfield, D M; Robinson, R A; Curtis, D*; Thompson, T* (2005) A study of the measurement issues associated with the monitoring of gaseous emissions from industrial plants. NPL Report. DQL-AS 022

Butterfield, D M; Robinson, R A (2004) Gaseous proficiency testing scheme for the STA, round 2. NPL Report. DQL-AS 006

Schiffmann, D; Butterfield, D M; Yardley, R E; Knight, A; Windsor, S A; Jones, C* (2004) Val-CiD Appendix A: CD spectroscopy: an inter-laboratory study. NPL Report. DQL-AS 009

Woolley, A M; Sweeney, B P; Butterfield, D M (2002) London air quality network: ratification report for January to June 2002. NPL Report. COAM 13

Woolley, A M; Sweeney, B P; Butterfield, D M (2002) UK automatic rural network: ratification report for January to June 2002. NPL Report. COAM 14

Sweeney, B P; Milton, M J T; Butterfield, D M; Woods, P T (2002) Comparison of national photometric ozone primary standards: Euromet project 414. NPL Report. COAM 15

Woolley, A M; Sweeney, B P; Butterfield, D M (2002) London Air Quality Network: ratification report for July to December 2001. NPL Report. COAM 10

Woolley, A M; Sweeney, B P; Butterfield, D M (2002) UK Automatic Rural Network: ratification report for July to December 2001. NPL Report. COAM 11

Woolley, A M; Butterfield, D M; Sweeney, B P (2001) London Air Quality Network: Ratification report for January to June 2001. NPL Report. COAM 3

Woolley, A M; Butterfield, D M; Sweeney, B P (2001) UK Automatic Rural Network: ratification report for January to June 2001. NPL Report. COAM 4

Andrews, A S; Brand, J; Butterfield, D M; Gee, R M (2001) UK ambient hydrocarbon air quality network: 2000 audit report. NPL Report. COEM 64

Butterfield, D M; Woolley, A M; Sweeney, B P (2001) London air quality network: ratification report for July to December 2000. NPL Report. COEM 62

Andrews, A S; Brand, J; Butterfield, D M; Gee, R M (2001) Summary of UK ambient hydrocarbon air quality network operations during 2000. NPL Report. COEM 61

Butterfield, D M; Woolley, A M; Sweeney, B P (2001) UK automatic rural network: ratification report for July to December 2000. NPL Report. COEM 63

Andrews, A S; Butterfield, D M; Gee, M G; Robinson, R A (2000) UK ambient hydrocarbon air quality network: 1999 audit report. NPL Report. COEM 52

Andrews, A S; Butterfield, D M; Robinson, R A; Alderwick, W A M; Gee, R M; Quaiter, C C (2000) Summary of UK hydrocarbon air quality network operations during 1999. NPL Report. COEM 50

Robinson, R A; Butterfield, D M; Andrews, A S; Odesola, L R (1999) Ambient Hydrocarbon Air Quality Monitoring Network: 1998 Audit Report. NPL Report. COEM 35

Andrews, A S; Butterfield, D M; Robinson, R A; Odesola, L R (1999) Summary of UK Ambient Hydrocarbon Air Quality Network operations during 1998. NPL Report. COEM 36

Woolley, A M; Sweeney, B P; Butterfield, D M (1999) London Air Quality Network: ratification report for July to December 1998. NPL Report. COEM 29

Woolley, A M; Sweeney, B P; Butterfield, D M (1999) UK Automatic Rural Network: ratification report for July to December 1998. NPL Report. COEM 30

Woolley, A M; Sweeney, B P; Butterfield, D M (1998) London air quality network: ratification report for: January to June 1998. NPL Report. COEM 22

Woolley, A M; Sweeney, B P; Butterfield, D M (1998) UK automatic rural network: ratification report for: January to June 1998. NPL Report. COEM 21

Robinson, R A; Casey, J D*; Andrews, A; Butterfield, D M; Swann, N R W (1998) Summary of UK ambient hydrocarbon air quality network operation during 1997. NPL Report. COEM 11

Butterfield, D M; Swann, N R (1996) Field measurements at Coldstone Quarry, Pateley Bridge, Harrogate. NPL Report. QM 126

Partridge, R H; Alphonso, D; Brookes, C; Butterfield, D M; D'Souza, H (1996) Multicomponent reference gas mixtures for the measurement of total organic carbon emissions from combustion sources. NPL Report. QM 118

Partridge, R H; Alphonso, D; Brookes, C; Butterfield, D M; D'Souza, H (1994) Provision of multicomponent hydrocarbon test mixtures and authentic air samples in a second intercomparison campaign to assess the measurement accuracy of laboratories carrying out VOC determinations in the European Community: report of work performed under EC contracts No. B4-3040/92/016847 and No. 5257-93-04 PC ISP GB. NPL Report. QU 103