Learn about the role of vehicle emissions in pollution, along with key legislation and best practices to mitigate its environmental effect.
Vehicle emissions generally refer to the gases and particles released into the air from the exhaust systems of motor vehicles. These emissions are the byproducts of burning fuel, such as gasoline or diesel, and include pollutants like carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbons (HC), particulate matter (PM), and carbon dioxide (CO₂).
Vehicle emissions have a considerable impact on the environment, as carbon dioxide is considered a greenhouse gas that drives climate change. The US Environmental Protection Agency (EPA) reports that the average passenger vehicle puts out about 4.6 metric tons of carbon dioxide every year, which is only compounded by the volume of vehicles being used for personal use, transportation, and other uses.
The United Nations also cites that the global transport sector is responsible for approximately one quarter of greenhouse gas emissions. There have since been major calls to control and mitigate emissions, especially with routine vehicle inspections, since air pollution presents negative effects on health and the environment.
In response to the findings about the effects of vehicle emissions, a number of standards and regulations have been implemented to control emissions across the globe. Here are a few to take note of:
The United Nations Global Technical Regulations (UN GTRs) aim to harmonize vehicle safety, environmental, and performance standards across different countries to facilitate global trade and improve road and environmental safety. UN GTRs include technical provisions for vehicle emissions, fuel efficiency, electric vehicles, and other automotive systems.
The Euro standards are a set of regulations established by the European Union (EU) to limit emissions from new vehicles sold within the region. These standards set strict limits on pollutants such as nitrogen oxides (NOx), carbon monoxide (CO), hydrocarbons (HC), and particulate matter (PM). Each progressive level imposes tighter restrictions, driving technological advancements in cleaner engines and exhaust treatment systems.
Enforced by the EPA, the Clean Air Act is a federal law designed to regulate air emissions from stationary and mobile sources within the US. It authorizes the EPA to set National Ambient Air Quality Standards (NAAQS) and establish emission standards for vehicles and fuels. It plays a key role in controlling smog, soot, and other pollutants harmful to public health and the environment.
In California, the Corporate Average Fuel Economy (CAFE) Standards govern the mileage vehicles must achieve on a single gallon of fuel. While focused on improving fuel economy, these standards indirectly reduce greenhouse gas emissions by encouraging manufacturers to produce more efficient vehicles.
Modeled after the Euro standards, Bharat Stage norms are emission regulations instituted by the Indian government to control air pollution from vehicles. India is one of the leading countries with significant levels of air pollution, and the government has developed policies that include strict limits on NOx, PM, and HC emissions.
Another nation that has experienced significant levels of air pollution is China, which prompted it to implement its own series of emission regulations. These rules govern the maximum allowable emissions from both light-duty and heavy-duty vehicles. China VI, the most recent, introduces stringent controls on NOx and PM, especially for diesel vehicles, aiming to curb the country’s significant air pollution challenges.
In response to the growing concerns over vehicle emissions, there has been a significant rise in the number of people opting for electric vehicles to decrease their carbon footprints. However, it is important to know that buying new vehicles is not necessarily the solution, and most businesses can benefit from building a more sustainable fleet through practices such as the following:
Ensure Regular Vehicle Maintenance: Ensure timely servicing, including oil changes, air filter replacements, and engine tune-ups, to keep vehicles running efficiently and reduce harmful emissions. Use maintenance checklists to streamline the inspection and document maintenance activities.
Provide Driver Training Programs: Educate drivers on fuel-efficient driving habits such as smooth acceleration, avoiding idling, and maintaining proper tire pressure to reduce fuel consumption and emissions.
Implement Fleet Telematics: Use GPS and telematics systems to monitor fuel usage, route efficiency, idling times, and vehicle performance for data-driven emission reduction strategies.
Optimize Route Planning: Use route optimization software to reduce travel distances and time, lowering fuel use and emissions from unnecessary driving.
Track and Report Emissions: Monitor fleet emissions regularly and maintain accurate records using smog checklists to identify high-emission vehicles, set reduction goals, and comply with regulatory requirements.
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