(For USM Staff/Student Only)

EngLib USM > Ω School of Civil Engineering >

Monitoring of ground-level ozone at roadside / Josiah Yong Say Jee

Monitoring of ground-level ozone at roadside_Josiah Yong Say Jee_A9_2011_875000483_NI
Sebahagian besar pencemaran udara yang disebabkan oleh pengangkutan bandar dan interaksinya dalam bandar telah menjadi masalah yang semakin meruncing hari ini. Peningkatan jumlah kenderaan telah menghasilkan kepekatan pencemar yang tinggi. Faktor meteorologi dan fenomena penyebaran yang lemah telah menyebabkan kepekatan pencemar yang tinggi. Kualiti udara terus menurun di bandar-bandar seluruh dunia dan ramai yang bimbang terhadap kesihatan mereka. Ozon merupakan penyumbang utama untuk asap fotokimia di bandar. Hal ini mendatangkan kesan negatif terhadap kesihatan manusia seperti kerosakan tisu paru-paru. Kepekatan tinggi ozon juga merosakkan spesies tanaman dan beberapa bahan semulajadi. Oleh sebab itu, semakin banyak kajian telah dijalankan untuk memahami pembentukan ozon dan faktor-faktor yang mempengaruhi peningkatan ozon. Penyelidikan ini melibatkan pemantauan kepekatan ozon di 10 pinggir jalan berbeza di Pulau Pinang dan menentukan faktor-faktor yang mempengaruhi kepekatan ozon. Sebanyak empat pembolehubah telah dipilih untuk kajian ini. Pembolehubah tersebut adalah kepekatan nitrogen dioksida, suhu, kelembapan relatif dan unit kereta penumpang (PCU). Pembolehubah ini juga digunakan untuk membentuk model untuk menganggar kepekatan ozon di atmosfera rendah Pulau Pinang. Dari kajian ini, suhu adalah berkadar terus dengan kepekatan ozon sementara kepekatan nitrogen dioksida dan kelembapan relatif adalah berkadar songsang dengan kepekatan ozon. PCU berkadar terus terhadap kepekatan nitrogen dioksida. Kepekatan ozon umumnya mencapai puncaknya pada tengahari dan menurun pada lewat petang. Kepekatan maksimum ozon adalah 128 ppb di Jalan Sungai Nibong. _________________________________________________________________________________________ Air pollution which is largely caused by urban transport and its interaction within the city has become a growing problem today. The increase in the number of vehicles generates a higher concentration of pollutants. Meteorology factor and poor dispersion phenomena had led to high pollutant concentrations. Air quality is constantly deteriorating in cities world-wide and more people are concerned for their health. Ground-level ozone is the main contributor to photochemical smog in cities. It is responsible for various negative health effects on human being such as damage to lung tissues. High concentration of ozone also damages plant species and several natural materials. Therefore, more and more studies have been done to understand formation of ozone and the factors that influence ozone concentration. This study involves the monitoring of ozone concentration at 10 different roadsides in Penang Island and determining the factors that influence the concentration of ozone. A total of four variables were selected for this study. The variables were nitrogen dioxide concentration, temperature, relative humidity and passenger car unit (PCU). These variables were also used to develop models to predict the ozone concentration in Penang Island’s lower atmosphere. From this study, it is found that temperature was directly proportional to ozone concentration while nitrogen dioxide concentration and relative humidity were inversely proportional to ozone concentration. PCU was directly proportional to nitrogen dioxide concentration. Ozone concentration generally peaked during midday and decreased during the evening. Ozone concentration was the highest at Jalan Sungai Nibong with a value of 128 ppb.
Contributor(s):
Josiah Yong Say Jee - Author
Primary Item Type:
Thesis
Identifiers:
Accession Number : 875000483
Language:
English
Subject Keywords:
Air pollution; dispersion phenomena; photochemical smog
First presented to the public:
6/1/2011
Original Publication Date:
6/7/2018
Previously Published By:
Universiti Sains Malaysia
Place Of Publication:
School of Civil Engineering
Citation:
Extents:
Number of Pages - 142
License Grantor / Date Granted:
  / ( View License )
Date Deposited
2018-06-07 17:00:42.565
Date Last Updated
2019-01-07 11:24:32.9118
Submitter:
Nor Hayati Ismail

All Versions

Thumbnail Name Version Created Date
Monitoring of ground-level ozone at roadside / Josiah Yong Say Jee1 2018-06-07 17:00:42.565