Air pollutants data such as PM10 carbon monoxide, sulphur dioxide and ozone concentration were obtained from automated monitoring stations. These data usually contain missing values that can cause bias due to systematic ...

Air pollution data such as PM10, sulphur dioxide, ozone and carbon monoxide are usually obtained using automated machines located at different sites. These are usually due to mechanical failure, routine maintenance, changes ...

Polystrene wastes are becoming a major environment concern; due to its large production quantities and its non-biodegrable nature. Provided that the high molecular-weight material can be broken down into useful low ...

Easy Fix Concrete Block is one of a new design of concrete block. This type of concrete block is Motarless Concrete Interlocking Blocks System. Concrete block inherent fire resistance, easy to use and attractive makes it ...

Polystyrene Concrete (PC) was fabricated by mixing the composition of cement and polystyrene wastes. The polystyrene wastes will act as coarse or fine aggregates in the mixture. PC can be transformed into useful product ...

Air pollution data obtained using automated machines often contain missing values which can cause bias due to systematic differences between observed and unobserved data. We used interpolation and mean imputation techniques ...