Evaluation of Air Pollution from Vehicular Emissions in Lagos Mainland, Lagos State

CHAPTER ONE

1.0 Introduction

Air pollution has become one of the most pressing environmental challenges in modern cities. As urban populations increase and transportation systems expand, the volume of pollutants released into the atmosphere also rises. Vehicular emissions are among the major sources of air pollution in urban centers. They release carbon monoxide, nitrogen oxides, hydrocarbons, and particulate matter that degrade air quality and harm human health.

In Nigeria, the problem of air pollution is more pronounced in densely populated and industrialized cities such as Lagos. With millions of vehicles operating daily, Lagos Mainland experiences high concentrations of traffic-related pollutants. According to Afolabi and Nwachukwu (2022), vehicular emissions contribute significantly to poor air quality, leading to respiratory illnesses and environmental degradation. Therefore, evaluating air pollution from vehicular emissions in Lagos Mainland is essential for creating sustainable transportation and air quality management strategies.

1.1 Background to the Study

Air pollution occurs when harmful substances such as gases, dust, or smoke are released into the atmosphere in concentrations that threaten the environment and human health. The World Health Organization (WHO, 2021) identified vehicular emissions as one of the leading causes of urban air pollution worldwide. These emissions come mainly from the combustion of fossil fuels in internal combustion engines.

In Lagos Mainland, heavy traffic congestion, poor vehicle maintenance, and the use of low-quality fuel increase the release of air pollutants. The city’s rapid urbanization and economic growth have also contributed to the rising number of vehicles on the road. Okonkwo and Eze (2023) observed that the high population density in Lagos Mainland amplifies the effects of pollution since residents and traders spend long hours in traffic jams, constantly exposed to exhaust fumes.

Air pollution has far-reaching consequences. It reduces air visibility, damages vegetation, accelerates building deterioration, and increases the prevalence of respiratory diseases such as asthma and bronchitis. Evaluating the extent of vehicular emissions in Lagos Mainland will help authorities design effective policies for emission control, vehicle inspection, and sustainable transportation planning.

1.2 Statement of the Problem

The increasing number of vehicles in Lagos Mainland has led to severe air pollution problems. Most vehicles operate with outdated engines and emit large amounts of toxic gases. Poor maintenance culture and the absence of strict environmental regulations worsen the situation. Consequently, air quality levels have declined significantly in recent years.

Despite various government initiatives, including traffic management reforms and public transport improvements, the problem of vehicular emissions persists. The limited availability of real-time air quality monitoring data has also made it difficult to understand the true extent of the problem. Therefore, this study seeks to evaluate air pollution resulting from vehicular emissions in Lagos Mainland and examine its implications for environmental quality and human health.

1.3 Aim and Objectives of the Study

The main aim of this study is to evaluate air pollution from vehicular emissions in Lagos Mainland, Lagos State.

The specific objectives are to:

1. Identify the main sources and types of vehicular emissions in Lagos Mainland.

2. Assess the concentration levels of major air pollutants in selected areas.

3. Examine the effects of vehicular emissions on human health and the environment.

4. Recommend strategies for reducing air pollution from vehicles in Lagos Mainland.

1.4 Research Questions

1. What are the major sources of vehicular emissions in Lagos Mainland?

2. What are the concentrations of key air pollutants in the area?

3. How do vehicular emissions affect human health and environmental quality?

4. What measures can reduce vehicular air pollution in Lagos Mainland?

1.5 Significance of the Study

This study is important because it provides empirical evidence on the extent of air pollution caused by vehicular emissions in Lagos Mainland. The findings will assist environmental agencies, policymakers, and health authorities in developing strategies to control air pollution and protect public health.

The study also contributes to achieving Sustainable Development Goal (SDG) 3, which promotes good health and well-being, and SDG 11, which aims to create sustainable cities and communities. Additionally, it will serve as a valuable reference for researchers and urban planners seeking to address pollution and transport-related environmental challenges in Nigeria.

1.6 Scope of the Study

The study covers selected areas within Lagos Mainland, including Yaba, Surulere, and Mushin. It focuses on air pollutants such as carbon monoxide (CO), nitrogen dioxide (NO₂), sulfur dioxide (SO₂), and particulate matter (PM₂.₅). The research will examine vehicular traffic patterns, emission sources, and their effects on environmental quality. However, industrial emissions are excluded since the focus is on vehicular sources.

1.7 Definition of Key Terms

• Air Pollution: The presence of harmful substances in the atmosphere that can affect living organisms and materials.

• Vehicular Emissions: Gases and particulates released from motor vehicles during fuel combustion.

• Particulate Matter (PM): Tiny solid or liquid particles suspended in the air, which can cause respiratory issues.

• Carbon Monoxide (CO): A colorless, odorless gas produced by incomplete combustion of fuel in engines.

• Air Quality: The condition of the air based on the amount of pollutants present.

References

Afolabi, O. T., & Nwachukwu, C. M. (2022). Assessment of vehicular emissions and their impact on air quality in Lagos. Journal of Environmental Studies, 14(2), 101–115.
Okonkwo, B. I., & Eze, S. A. (2023). Urban air pollution from transportation sources in Nigeria: The case of Lagos Mainland. Environmental Research Letters, 18(1), 55–69.
World Health Organization (WHO). (2021). Global Air Quality Guidelines: Particulate Matter, Ozone, Nitrogen Dioxide, and Sulfur Dioxide. WHO Press, Geneva