A poor Indoor Air Quality (IAQ) is a crucial problem which produces by the improper maintenance of Mechanical Ventilation and Air Conditioning (MVAC) ducting. A budget constraint intimidates for the practise of monitoring of the MVAC ducting. Thus IAQ measurements were conducted at the room where the air supplied by centralized air conditioning. It has been performed at four different offices that supply by two different Air Handling Unit (AHU). Walkthrough survey was conducted and the area samplings were selected for data collection. This paper examines the result of comparison of air ducting and air quality at academic office building, Universiti Tun Hussein Onn Malaysia (UTHM). The parameters involved were Temperature (°C), Relative Humidity (RH), Carbon Dioxide (CO2) and Carbon Monoxide (CO). Pictures were also captured to demonstrate the real conditions inside the ducting by using Mechanical Robot. Thus, duct cleaning was recommended to be an exceptional platform for the IAQ improvement.
In this research, the biodiesel from WCO is used in order to reduce the exhaust emission and to investigate the
community perception regarding to the human health. Biodiesel production is conducted using trans-esterification
process with holding time of 2 hours, temperature of 60 oC and conventional frequency of 20 kHz and then followed
by washing process with holding time of 1 hours, temperature of 50 oC and the frequency of 5 kHz. Biodiesel can
reduce exhaust emission of NOx up to 55%, NO gas up to 57%, increase CO gas up to 25% and increase CO2 gas up
to 43.18% as compared to diesel fuel. In addition, biodiesel is achieve good responds from 35 respondents about the
biodiesel importance.
This study was done to investigate the background level on microbiological indoor air pollutants in new constructed 8 stories buildings (2 level of Hostel facilities, 3 level of Training Room level, 2 level of Offices and 1 Exhibition Halls and Rooms) in Bandar Baru Bangi, Selangor. The offices and exhibition hall are carpeted furnished. All these spaces were using centralized air conditioning system. Airborne microbes’ concentrations were determined by using a single stage impactor (Biosampler) as per requirement of National Institute of Occupational Safety and Health NIOSH method NIOSH Manual Analytical Method MAM 0800. Mean concentration of total bacteria detected is 1351 CFU/m3 and it was found significantly higher compared to maximum exposure limit 500 CFU/m3 in office room. The mean concentration of total fungi in the office rooms is 479 CFU/m3 and it was found slightly lower compared to maximum exposure limit 500 CFU/m3. The airborne microbe levels were found slightly lower in the accommodation, training and exhibition rooms compared to office room. These findings indicate that although a new constructed building should be having a significant background level of airborne microbe (total bacteria and total fungi).
An awareness of possible risk factor in pesticides, by changing attitude towards the correct technique during spraying and
changing behavior can increase safety of workers safety as well as performance. However, there is a limited study and not highlighted
deeply in knowledge, attitude and practices of workers in palm oil plantation issue. Therefore , the objective of this paper is to identify
the relationship between knowledge, attitude and practices of pesticides among the plantation workers. The quantitative method were
used in this paper whereby 132 respondents as pesticide sprayer which represent 90% of the population of palm oil workers in Johor.
The result of spearman correlation indicates that there is significant relationship between knowledge and practices. It shows the
common pattern of high knowledge resulting high practices of the workers during spraying the pesticides at plantation. There is no
relationship between knowledge and attitude and between attitude and practice of the workers at the workplace. This paper shows that
knowledge need to be strengthen in agricultural communities of Johor in order to reduce health problem and sosial issue statistic and
prevent for any future accident. Human exposure to pesticides is an important health and sosial issue as it usually results in serious
health problems such as stroke, epilepsy, respiratory disorders and cancer. Death has been known to occur in some places as a result
of exposures to pesticides. Therefore, more impact knowledge-focused programs need to be arranged and implemented to inculcate
the better awareness of pesticides among palm oil workers, as without knowledge, people may become less careful and therefore are
exposed to pesticide poisoning and other long term exposure illness in the future.
Local Exhaust Ventilation (LEV) is required to absorbed the chemical and at the same time to maintain the air quality. This
study is purposed to create new design of LEV system that believe can remove air contaminants in the chemical store buildings. This
research was conducted using two (2) types of LEV system which are 4 air-inlets LEV (type 1) and 3 air-inlets LEV (type 2). That LEV
has been simulated using ANSYS FLUENT software for their air flow performances. LEV material and the cost of production were
considered parameter for fabricating and effectiveness of LEV system. Results show that air velocity in LEV type 1 was gradually
uniform throughout its ducting network but it increased at the 90º bend section with a maximum air velocity of 31.054 m/s. In the LEV
type 2, the air flow simulations depicted uniformity velocity values of 8.12 m/s, 8.58 m/s and 7.69 m/s at every inlet respectively. The
finding suggests that LEV type 2 was more efficient compared to LEV type 1 due to increasing streamline air velocity.
Indoor air quality has been a major public concern recently. Several health effects are related to this problem.
Findings from several studies have shown MVAC system as the main contributor for IAQ problem. Good practice of
maintenance and servicing is important to maintain MVAC system, especially the filter. Good air filtration for MVAC
system is needed to make sure adequate air is received by the occupants. This paper illustrated a recent study of air
filtration for MVAC system especially for several industries that used MVAC system in their premises. This paper also
proposed an air filtration study for a better air quality. Several Acts and Regulations related to Safety and Health were
identified to create the framework for the proposed study. Air filtration technique was used in this preliminary study
to set up guidelines to create safe and clean indoor spaces for workers and occupants.