Nancy Nyawira Mwangi

Nancy Nyawira

Nancy graduated from Jomo Kenyatta University of Agriculture and
Technology in the year 2012 with a second class honours (Upper
division) in Bachelor of science Geomatic Engineering and Geospatial
Information Systems. Her undergraduate project was on
environmental sustainability titled “Analysis of Land degradation in
Mwea division”. This involved use of GIS and remote sensing
techniques which she acquired during her undergraduate studies. After
graduating she worked with Geo-acre surveys as a graduate land
surveyor. She later joined the ministry of lands and physical planning
where she was posted at Survey of Kenya as a Geospatial Engineer.
Nancy wanted to expand her knowledge on environmental science
hence decided to study masters in Nuclear science when she got a
scholarship from Kenya Nuclear Electricity Board. Her masters thesis
was integrating GIS and Nuclear techniques to evaluate air pollution
in Nairobi city.

Project Summary

Assessment and Mapping of Black Carbon and PM2.5 Variability: A

case study in Nairobi city.

Airborne particulate matter is of great concern in the global
environment due to associated negative effects on human health and
environment. Air sampling was conducted at nine selected sites within
Nairobi city between 17/05/2016 to 22/06/2016. The mean 8-h PM2.5
concentrations in the selected nine sampling sites for the study ranged
between 147 ± 89 μg m-3 and 52 ± 4 μg m-3

. Mean BC concentration

for the nine sampling sites ranged from 8.6 ± 3.3 μg m-3

to 2.1 ± 1.2

μg m-3
. OLS dispersive models were further used to map out the
pollution levels across the city. Elemental content of the sampled fine
particulates included Cu, Mn, Zn, Fe, Pb, and Zr which were found to
be above detection limits of 50, 1210, 470, 200, 30 and 480 ng m-3
respectively. The detected trace elements accounted for 15 % of the
species in PM2.5, while BC accounted for 8 %.