Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2013.294.30010 Concentration Modeling by using Lognormal Distribution]]>HamidHazrul Abdul YahayaAhmad Shukri RamliNor Azam Zia Ul-SaufieAhmad 22013132Air pollution is one of the most important issues that are
often discussed, it is important to carry out the study on air pollution modeling.
Air pollution models play an important role and very useful because it can help
local authorities to carry out suitable action to reduce the impact of air pollution.
Finding the best model would allow prediction to be made accurately. Statistical
distribution modeling plays an important role in predicting air pollutant concentration.
Lognormal distribution is one of the distributions that widely used in environmental
engineering. One of the important steps in statistical distribution modeling
is parameter estimation. There are several methods can be used to estimate the
parameter in fitting distribution for air pollutant concentration data. This
research compared the performance of parameter estimator for two-parameter and
three-parameter lognormal distribution by using PM10 concentration
in Nilai, Negeri Sembilan, Malaysia. Two methods were used to estimate the parameters
in this study which is method of moments and method of probability weighted
moments. Five performance indicators are used to determine the best estimator
and the best distribution to represent the PM10 concentration in
Nilai, Negeri Sembilan from 2003 to 2009. Results show that three-parameter
lognormal distribution performs better compared to two-parameter lognormal distribution.]]>Department of Environment Malaysia,20052005Department of Environment Malaysia,20102010Evans, M., N. Hasting and B. Peacock,20003rd Edn.,Gilbert, R.O.,1987pp: 336pp: 336Hosking, J.R.M.,199052105124Johnson, N., S. Kotz and N. Balakrishnan,1994Juneng, L., M.T. Latif, F.T. Tanggang and H. Mansor,20094345844594Juneng, L., M.T. Latif and F. Tanggang,20114543704378 Junninen, H., H. Niska, K. Tuppurainen, J. Ruuskanen and M. Kolehmainen,20043828952907Kite, G.W.,1997Lopez, R.E.,1977105865872Lu, H.C. and G.C. Fang,20033734913499Yusof, N.F.F.M., N.A. Ramli, A.S. Yahaya, N. Sansuddin, N.A. Ghazali and W. Al Madhoun,201010 concentration.]]>163655667Norazian, M.N., M.M.A. Abdullah, C.Y. Tan, N.A. Ramli, A.S. Yahaya and N.F.M.Y. Fitri,201122318324Sansuddin, N., N.A. Ramli, A.S. Yahaya, N.F.F.M. Yusof, N.A. Ghazali and W.A.A. Madhoun,201110 concentrations at different locations in Malaysia.]]>180573588Taylor, J.A., A.J. Jakemen and R.W. Simpson,19862017811789Ul-Saufie, A.Z., A.S. Yahaya, N.A. Ramli and H.A. Hamid,201210 concentration prediction based on gaseous and meteorological parameters.]]>1214881494WHO,19981998Yahaya, A.S., N.A. Ramli and N.F. Yusof,20052005Yee, E. and R. Chan,1997319911002Afroz, R., M.N. Hassan and N.A. Ibrahim,2003927177