Sam-Erik Walker
Scientist
+47 63 89 80 83
+47 997 00 159
Urban Environment and Industry
Kjeller
sew@nilu.no
Sam-Erik Walker holds an M.Sc. in Statistics and a B.Sc. in Computer Science from the University of Oslo.
He has over 30 years of experience developing and applying air pollution dispersion models for cities and urban areas and analysing air quality data using various numerical and statistical tools and methods. These include deterministic and probabilistic methods for model evaluation and validation, data assimilation, ensemble modelling, and data fusion to combine air quality observations with model results. He is one of the principal authors of several of the present models at NILU, including the urban air pollution dispersion model EPISODE.
He is also the leading developer behind the AirGAM trend and prediction model at NILU. This model enables the estimation of meteorology-adjusted long-term trends of air pollutants such as NO2, O3, PM, and VOCs at air quality stations in Norway and Europe. It has been used to quantify the effects of lockdowns during the recent COVID-19 pandemic and for estimating long-term trends for all EEA stations in Europe.
Recently, he developed the AirRisk model, a risk assessment model to quantify the risk or probability of exceeding limit values of NO2 and PM in connection with recent assessment studies in various Norwegian cities and urban areas, including Lørenskog, Drammen, and Oslo.
He actively disseminates scientific knowledge by writing reports and papers and regularly participates in scientific conferences. His primary motivation for working at NILU is to contribute to a cleaner world.
Sam-Erik Walker has 30 publications at NILU:
2024
2024
2024
2024
2023
2021
2021
2021
2020
2020
2020
2020
2020
2019
2019
2018
Revision of air quality assessment for Drammen
NILU, in collaboration with Asplan Viak AS, has prepared a local air quality assessment for Drammen municipality. The project includes an assessment of air quality in Drammen through traffic calculations […]
Air quality assessment for Lørenskog municipality
The air quality assessment for Lørenskog municipality covers mapping of the air quality through traffic, emission and dispersion calculations of PM10, PM2,5 and NO2 for the present situation (2019) and […]
Model Advancements for high Spatial and TEmporal Resolution simulations of environmental toxics (SIS MASTER)
The main goal of the project is to modify and enhance NILUs existing atmospheric models to allow for improved simulation of traditional air pollutants (e.g., NO2, PM2.5, PM10) at very […]
Air quality assessment for Tromsø
NILU and Urbanet analyse have prepared a revised air quality assessment for Tromsø. The action plan, including strategies and measures, aims to reduce air pollution to a level that meets […]
Sam-Erik Walker holds an M.Sc. in Statistics and a B.Sc. in Computer Science from the University of Oslo.
He has over 30 years of experience developing and applying air pollution dispersion models for cities and urban areas and analysing air quality data using various numerical and statistical tools and methods. These include deterministic and probabilistic methods for model evaluation and validation, data assimilation, ensemble modelling, and data fusion to combine air quality observations with model results. He is one of the principal authors of several of the present models at NILU, including the urban air pollution dispersion model EPISODE.
He is also the leading developer behind the AirGAM trend and prediction model at NILU. This model enables the estimation of meteorology-adjusted long-term trends of air pollutants such as NO2, O3, PM, and VOCs at air quality stations in Norway and Europe. It has been used to quantify the effects of lockdowns during the recent COVID-19 pandemic and for estimating long-term trends for all EEA stations in Europe.
Recently, he developed the AirRisk model, a risk assessment model to quantify the risk or probability of exceeding limit values of NO2 and PM in connection with recent assessment studies in various Norwegian cities and urban areas, including Lørenskog, Drammen, and Oslo.
He actively disseminates scientific knowledge by writing reports and papers and regularly participates in scientific conferences. His primary motivation for working at NILU is to contribute to a cleaner world.
Sam-Erik Walker has 30 publications at NILU:
2024
2024
2024
2024
2023
2021
2021
2021
2020
2020
2020
2020
2020
2019
2019
2018
Revision of air quality assessment for Drammen
NILU, in collaboration with Asplan Viak AS, has prepared a local air quality assessment for Drammen municipality. The project includes an assessment of air quality in Drammen through traffic calculations […]
Air quality assessment for Lørenskog municipality
The air quality assessment for Lørenskog municipality covers mapping of the air quality through traffic, emission and dispersion calculations of PM10, PM2,5 and NO2 for the present situation (2019) and […]
Model Advancements for high Spatial and TEmporal Resolution simulations of environmental toxics (SIS MASTER)
The main goal of the project is to modify and enhance NILUs existing atmospheric models to allow for improved simulation of traditional air pollutants (e.g., NO2, PM2.5, PM10) at very […]
Air quality assessment for Tromsø
NILU and Urbanet analyse have prepared a revised air quality assessment for Tromsø. The action plan, including strategies and measures, aims to reduce air pollution to a level that meets […]