Brian Barton
Australia generally enjoys good air quality, but the country still faces significant pollution challenges. Air pollution in Australia is linked to over 3,200 deaths a year, with an estimated cost of A$6.2 billion. The main sources of air pollution in Australia are human-influenced, including vehicle engines, road traffic, industrial processes, power generation, and domestic wood heaters. Natural sources of air pollution include dust storms and wildfires, which are becoming more frequent due to climate change. Fine particulate matter (PM2.5) is a significant pollutant of concern, causing respiratory and cardiovascular issues, especially in vulnerable groups such as children, the elderly, and those with pre-existing health conditions. Australia has taken some steps to improve air quality, but more comprehensive action is needed to address the health, environmental, and economic impacts of air pollution.
| Characteristics | Values |
|---|---|
| Global rank in air pollution | 128/138 |
| Air quality | Generally good |
| Air quality standards | National Environment Protection Measure for Ambient Air Quality (Air NEPM) |
| Number of pollutants in Air NEPM | 7 |
| Pollutants in Air NEPM | Carbon monoxide (CO), lead, nitrogen dioxide (NO2), ozone (O3), particulate matter (PM2.5 and PM10), sulphur dioxide (SO2) |
| Pollutants exceeding Air NEPM standards | Particulate matter, ozone |
| Most hazardous pollutant | PM2.5 |
| AQI on 25 June 2025 | 16 (Good) |
| AQI on 25 June 2025 (worst) | 40 (Good) |
| AQI on 25 June 2025 (best) | 17 (Good) |
| Bushfires impact on air quality | Significant |
| Bushfires impact on health | 429 premature deaths, 3000+ hospitalisations |
| Global carbon footprint | 4.5% of global fossil carbon dioxide emissions |
| Per capita CO2 emissions | Among the world's highest |
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What You'll Learn
- Natural sources of air pollution: dust storms and wildfires
- Human-influenced air pollution: combustion engines, road traffic, industrial processes
- Health impacts: respiratory and cardiovascular issues, increased hospitalisations and deaths
- Government action: NEPM standards, Clean Air Plan for Sydney, reducing pollution sources
- Solutions: switching to cleaner energy, improving efficiency, decreasing vehicle emissions
Natural sources of air pollution: dust storms and wildfires
Australia's air pollution comes from a range of natural and human-made sources. Two important natural sources of air pollution in Australia are dust storms and wildfires.
Dust storms occur when strong winds lift dust and dirt from the ground and carry them high into the atmosphere over a large area. The main sources of dust in Australia are dry lakes and deserts, with the Lake Eyre basin being the primary source. Dust storms can cause health issues for vulnerable groups, such as children, the elderly, and those with pre-existing health conditions. They can also lead to negative impacts due to reduced visibility, such as increased traffic accidents.
Wildfires, often referred to as bushfires in Australia, have been a significant natural source of air pollution in the country. The 2019-2020 wildfire season in southeast Australia was particularly devastating, releasing substantial amounts of carbon dioxide into the atmosphere. These fires burned an estimated 19 million hectares, with 12.6 million hectares of forest and bushland destroyed. The combination of strong winds and wildfires can generate fire whirls, similar to tornadoes, which spread flames and burning debris over vast distances.
Several factors contribute to the occurrence and intensity of wildfires in Australia. A 2001 study found that the disruption of traditional burning practices and unrestrained logging made certain areas more susceptible to wildfires, especially during the dry season. The introduction of non-native grass species, such as gamba grass, has also fueled intense bushfires, leading to long-term environmental damage. Additionally, the country's hot, arid climate, population density, and drought conditions can influence the frequency and severity of wildfires.
The Australian government has implemented the Australian Fire Danger Rating System to communicate fire danger levels to the community effectively. Remote monitoring of wildfires is conducted using satellite data and UAVs to assist firefighting agencies in assessing and managing risks.
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Human-influenced air pollution: combustion engines, road traffic, industrial processes
Australia's air pollution comes from a mix of natural and human-made sources. Human-influenced air pollution is caused by combustion engines, road traffic, and industrial processes.
Combustion Engines
The 19th-century invention of the internal combustion engine revolutionized transportation but has posed, and continues to pose a significant threat to the environment. Internal combustion engines operate through the ignition and combustion of a fuel-air mixture within a confined space. The most common type is the reciprocating, spark-ignited, four-stroke gasoline engine found in most automobiles. Two-stroke engines, on the other hand, have a simplified operational cycle that combines the compression and ignition phases in one stroke and the intake and exhaust in another. This design results in lower fuel efficiency and greater exhaust emissions, including soot, unburned fuel, and pollutants such as hydrocarbons, particulate matter, sulfur dioxide, sulfur trioxide, and carbon monoxide.
Road Traffic
In urban areas, motor vehicles and road traffic are the primary sources of air pollution. Australia has a high rate of private vehicle ownership, with over 90% of households owning at least one registered motor vehicle. Traffic congestion increases vehicle emissions and degrades air quality, with studies showing excess morbidity and mortality for drivers, commuters, and those living near major roads. High traffic volumes and congestion lead to increased emission rates and health risks, particularly for on-road and near-road populations.
Industrial Processes
Industrial pollution refers to the contamination of the air, water, and soil caused by industrial activities, including manufacturing, processing, and extracting raw materials. Refineries, steel mills, mining operations, chemical production facilities, and commercial transportation are all sources of industrial pollution. These activities emit a range of airborne pollutants, such as PM2.5, silica dust, coal dust, methane, carbon monoxide, sulfur dioxide, nitrogen oxides, volatile organic compounds (VOCs), and hazardous air pollutants (HAPs). In Australia, domestic wood heating is a significant contributor to air pollution during winter, accounting for at least 50% of winter ambient particulate matter.
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Health impacts: respiratory and cardiovascular issues, increased hospitalisations and deaths
Air pollution is a pressing issue in Australia, with significant health consequences for the population. The country's air pollution comes from a mix of natural and human-made sources, including vehicle engines, road traffic, industrial processes, power generation, and domestic wood heaters. The health impacts of this air pollution are wide-ranging and include respiratory and cardiovascular issues, increased hospitalisations, and even premature deaths.
Respiratory issues caused by air pollution are a major concern in Australia. Air pollution increases the risk of respiratory infections such as influenza and COVID-19 and may also increase their severity. It can also lead to decreased lung function and increased respiratory symptoms. The elderly, children, and people with pre-existing health conditions are especially vulnerable to these respiratory issues.
Cardiovascular disease (CVD) is another leading cause of illness and death in Australia, and air pollution is a significant contributing factor. The harmful mix of solid particles and gases in the air can lead to heart conditions, strokes, and an increased risk of CVD. According to the World Health Organization, nearly 45% of air pollution-associated deaths worldwide are due to CVD, highlighting the severe impact of air pollution on cardiovascular health.
The impact of air pollution on health extends beyond respiratory and cardiovascular issues. It can also worsen communicable diseases and increase the risk of non-communicable diseases such as dementia, type 2 diabetes, lung diseases, and cancer. Additionally, air pollution can have detrimental effects on the growth, development, and overall health of unborn babies.
The economic costs of air pollution-related health issues are substantial. In Australia, the annual mortality costs of fine particulate matter (PM2.5) air pollution are estimated at A$6.2 billion. Furthermore, the World Bank estimated the global economic cost of air pollution-related deaths at US$225 billion in lost labour income and more than US$5 trillion in welfare losses.
While Australia has air quality standards in place, known as the National Environment Protection Measure for Ambient Air Quality (Air NEPM), air pollution continues to pose a significant risk to the health of Australians. To mitigate these risks and reduce the health, environmental, and economic impacts of air pollution, urgent national action and effective policy measures are needed.
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Government action: NEPM standards, Clean Air Plan for Sydney, reducing pollution sources
Australia's air pollution comes from a range of natural and human-made sources. Human-influenced sources include combustion in vehicle engines, road traffic, industrial processes, power generation, and domestic wood heaters. Natural sources include dust storms and wildfires.
To combat this, Australia has implemented the National Environment Protection Measure for Ambient Air Quality (Air NEPM), which sets standards for seven pollutants: carbon monoxide (CO), lead, nitrogen dioxide (NO2), ozone (O3), particulate matter (PM2.5 and PM10), and sulphur dioxide (SO2). While most of these pollutants meet the NEPM standards, particulate matter and ozone often exceed the 24-hour exposure limits.
In recognition of the health impacts of air pollution, which include decreased lung function, increased respiratory symptoms, and an increased risk of cardiovascular disease, lung cancer, shortened life expectancy, and premature death, the Australian government has taken several actions to improve air quality.
The National Environmental Science Program, funded by the Australian Government's Department of the Environment and Energy, supports air quality research. The National Environment Protection Council (NEPC) has also approved variations to the Ambient Air Quality NEPM standards to strengthen the standards for ozone, nitrogen dioxide, and sulfur dioxide, reflecting the latest scientific understanding of the health risks associated with particle pollution.
Additionally, the Clean Air Plan for Sydney aims to address air quality issues in New South Wales. This research is also funded by the National Environmental Science Program.
Furthermore, the Australian government encourages facilities to use cleaner production techniques to reduce substance emissions and waste through initiatives like the National Pollution Inventory (NPI). The NPI provides data to governments to assist with environmental planning and management, helping to identify and prioritise actions to improve air quality.
To reduce pollution sources, the government promotes the use of public transportation and active travel, such as cycling or walking, to lower air pollution emissions from private vehicles. They also work with states and territories to improve air quality and reduce people's exposure to air pollution under the National Clean Air Agreement.
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Solutions: switching to cleaner energy, improving efficiency, decreasing vehicle emissions
Australia's air pollution comes from a range of natural and human-made sources. Human-influenced sources include combustion in vehicle engines, road traffic, industrial processes, power generation, and domestic wood heaters. In urban areas, motor vehicles and road traffic are the main sources of air pollution. Australia has one of the world's highest rates of private vehicle ownership, with over 90% of households owning at least one registered motor vehicle. The transport sector accounts for 16% of Australia's greenhouse gas emissions, with light vehicles contributing the largest share of 10%.
To decrease vehicle emissions, Australia can focus on improving the efficiency of its light vehicle fleet. Smaller vehicles are generally more fuel-efficient than larger vehicles, and increasing the proportion of smaller cars in the fleet is likely to decrease emissions. Improvements in vehicle technology and fuel efficiency are key to reducing emissions, as highlighted by the Climate Change Authority. Additionally, encouraging the use of public transport, active travel such as cycling or walking, and the adoption of electric vehicles can help reduce vehicle emissions.
To improve efficiency and reduce pollution, individuals can make conscious choices in their daily lives. This includes opting for fuel-efficient vehicles, using energy-efficient appliances, and reducing energy consumption by turning off electrical appliances when not in use. Industries can also play a role by adopting cleaner production techniques, improving manufacturing processes, and reducing waste.
Switching to cleaner energy sources is crucial for reducing pollution. Australia has made significant progress in this area, with renewables accounting for nearly 40% of the country's total electricity supply. The Clean Energy Council is working to accelerate the energy transition and bring the benefits of renewables to all Australians. The country aims to achieve an ambitious target of 82% renewables by 2030, showcasing its commitment to becoming a renewable energy superpower.
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Frequently asked questions
Australia generally experiences good air quality. However, air pollution is linked to more than 3,200 deaths a year in the country, and it is estimated that exposure to air pollution results in 4,880 premature deaths annually.
Air pollution in Australia comes from both natural and human-made sources. Natural sources include dust storms and wildfires, while significant human-influenced sources include combustion in vehicle engines, road traffic, industrial processes, power generation, and domestic wood heaters.
Air pollution in Australia has been linked to an increased risk of various health conditions, including heart disease, stroke, dementia, type 2 diabetes, lung diseases, and cancer. It can also worsen respiratory infections such as influenza and COVID-19. Additionally, air pollution can affect the growth, development, and overall health of unborn babies.
There have been calls for coordinated national leadership and a new approach from the government to reduce air pollution in Australia. Some specific measures suggested include decarbonising energy and transport systems, greening cities, improving urban and housing design, and implementing bushfire prevention strategies.
In 2019, Australia ranked as the 10th cleanest country out of 98 countries included in IQAir's World Air Quality Report. However, during the "Black Summer" bushfires of 2019-2020, the air pollution in Australia was 15 times worse than levels considered safe by the World Health Organization (WHO).
