Urban smog with electric vehicles breaking through

Driving Change: How Vehicle Choices Impact Air Quality

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Rhea Morgan in Climate & Environment October 2026 • 3 min read.

"Uncover the surprising link between your car and city pollution levels, and what Shijiazhuang's study reveals about creating healthier urban environments."


In recent years, the issue of air pollution has escalated, particularly in rapidly developing urban centers. Among the contributing factors, vehicle emissions have emerged as a primary concern. The correlation between the increasing number of vehicles and the degradation of air quality is becoming alarmingly evident.

A study focusing on Shijiazhuang, a city experiencing rapid economic growth, sheds light on this pressing issue. With vehicle numbers growing by 20% annually, the city's air quality faces significant challenges. By August 2017, Shijiazhuang had more than 2.6 million vehicles. The study seeks to understand the relationship between different types of motor vehicles and overall air pollution levels.

By analyzing traffic data from key roads like Heping East Road and Yuhua East Road, and utilizing the Emissions and Dispersion Modeling System (EDMS), the study assesses the specific contributions of various vehicle types to pollution. Understanding these relationships is vital for developing effective strategies to reduce emissions and improve air quality in urban areas.

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Vehicle Types and Their Impact on Pollution: What the Data Reveals

Urban smog with electric vehicles breaking through

The research conducted in Shijiazhuang provides critical insights into how different vehicle types contribute to air pollution. The study highlights that small cars, comprising a significant portion of the total vehicle volume, are major contributors to overall emissions. Here's a breakdown of the key findings:

Small Cars: These vehicles account for approximately 85% of the total traffic volume. The study indicates that small cars are responsible for a substantial portion of pollutant emissions.

  • CO (Carbon Monoxide): Small cars contribute about 68% of the total CO emissions.
  • HC (Hydrocarbons): Roughly 74% of HC emissions are attributed to small cars.
  • NOx (Nitrogen Oxides): Small cars account for 77% of the total NOx emissions.
  • PM10 (Particulate Matter): Around 77% of PM10 emissions come from small cars.
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Medium-Sized Vehicles and Trucks: While these vehicles make up smaller percentages of the total traffic, their contributions to pollution are also noteworthy. The study highlights the specific emissions from these vehicle types and their overall impact on air quality.

Taking Action: Strategies for Reducing Vehicle Emissions

The findings from Shijiazhuang's study underscore the importance of implementing targeted strategies to reduce vehicle emissions. By understanding the specific contributions of different vehicle types, cities can develop effective policies such as road pricing and limitations on the number of motor vehicles to improve air quality and create healthier urban environments.

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How Shijiazhuang's traffic findings compare with other pollution studies

A separate Shijiazhuang analysis of July 2007 attributed an average 2.7% of daily PM2.5 concentration to traffic, while industrial and power-plant sources had larger shares in that analysis.[1]

Vehicle types and modeled emissions on Shijiazhuang roads

PopulationMotor vehicle types and air pollution in Shijiazhuang[2]
SettingHeping East Road and Yuhua East Road, Shijiazhuang[2]
Effect sizeSmall cars account for 85% of the total traffic volume; vehicle exhaust accounts for 68% of CO, 74% of HC, 77% of NOx and 77% of PM 10[2]
Times cited1[2]

What the traffic shares do and do not establish

The results place small cars prominently in the traffic mix, while the pollutant shares describe vehicle exhaust’s contribution to emissions rather than the share of all city pollution from every source.[2]

Because the analysis compared road traffic information with an emissions inventory calculated using EDMS, it describes modeled emissions associated with the studied traffic, not a complete accounting of pollution from all sources.[2]

The paper reports a strong correlation between air pollution and the number of small cars, but correlation alone does not establish that small-car numbers caused changes in overall air quality.[2]

What remains unresolved about traffic and city air

  • How much of measured citywide air pollution, rather than modeled vehicle exhaust emissions, is attributable to traffic when other pollution sources are considered?[2]
  • Would the relationship between small-car numbers and air pollution hold across roads beyond the selected traffic locations?[2]

Sources

  1. Quantifying the Sources of the Severe Haze over the Southern Hebei Using the CMAQ Model (pmc.ncbi.nlm.nih.gov)
  2. Correlation Analysis between Motor Vehicle Types and Air Pollution in Shijiazhuang City (IOP Publishing, 2018)

About this Article -

Written with AI assistance from published research, and reviewed by the Mystum team. See our About page for more information.

This article is based on research published under:

DOI-LINK: 10.1088/1755-1315/153/6/062005, Alternate LINK

Title: Correlation Analysis Between Motor Vehicle Types And Air Pollution In Shijiazhuang City

Subject: General Engineering

Journal: IOP Conference Series: Earth and Environmental Science

Publisher: IOP Publishing

Authors: Wei-Yi Pan, Hong-Yan Shen

Published: 2018-05-01

Everything You Need To Know

1

What specific types of vehicles contribute the most to air pollution, according to the Shijiazhuang study?

The Shijiazhuang study identifies small cars as major contributors to air pollution. These vehicles, representing approximately 85% of the total traffic volume, are responsible for a significant portion of key pollutants. For example, small cars account for roughly 68% of Carbon Monoxide (CO) emissions, 74% of Hydrocarbons (HC), 77% of Nitrogen Oxides (NOx), and 77% of Particulate Matter (PM10). Medium-sized vehicles and trucks also contribute to the overall emissions, though to a lesser extent than small cars.

2

How does the growth of vehicle numbers impact air quality, and what evidence supports this, specifically referencing the city of Shijiazhuang?

The growth of vehicle numbers directly correlates with the degradation of air quality. Shijiazhuang provides a clear example of this. With an annual growth rate of 20% in vehicle numbers, the city's air quality faces significant challenges. By August 2017, Shijiazhuang had over 2.6 million vehicles. The study analyzes traffic data and utilizes the Emissions and Dispersion Modeling System (EDMS) to understand the relationship between vehicle types and overall air pollution levels, thus highlighting the impact of increasing vehicle numbers.

3

What are the key pollutants emitted by small cars, and what percentages of the total emissions do they represent, according to the Shijiazhuang study?

The Shijiazhuang study pinpoints several key pollutants emitted by small cars. These vehicles contribute significantly to Carbon Monoxide (CO), Hydrocarbons (HC), Nitrogen Oxides (NOx), and Particulate Matter (PM10) emissions. Specifically, small cars are responsible for about 68% of total CO emissions, 74% of HC emissions, 77% of NOx emissions, and approximately 77% of PM10 emissions. This data underscores the substantial impact of small cars on air pollution.

4

Beyond identifying pollution sources, how can cities utilize the findings from studies like the one in Shijiazhuang to improve air quality?

Cities can use the findings from studies like the one in Shijiazhuang to develop targeted strategies for reducing vehicle emissions. By understanding the specific contributions of different vehicle types, cities can implement effective policies. These policies could include road pricing, which can discourage the use of high-emitting vehicles, and limitations on the number of motor vehicles allowed in certain areas or during specific times. These measures can help improve air quality and create healthier urban environments.

5

What specific methods did the Shijiazhuang study use to analyze the impact of different vehicle types on air quality?

The Shijiazhuang study employed several methods to analyze the impact of different vehicle types on air quality. The researchers analyzed traffic data collected from key roads, such as Heping East Road and Yuhua East Road. They also utilized the Emissions and Dispersion Modeling System (EDMS). This system helped them to assess the specific contributions of various vehicle types to pollution levels. This combination of traffic data analysis and the use of a sophisticated modeling system allowed the researchers to understand the relationship between vehicle types and air quality.

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