Kiera Jefferson
Beijing is one of the most air-polluted cities in the world. In 2013, the city's PM2.5 (particulate matter smaller than 2.5 micrometers in size) levels were nearly 1,000 μg per cubic meter, which had a detrimental impact on people's health, especially during the cold seasons. The air pollution in Beijing is caused by car emissions, and it is made worse by wind, which prevents the minuscule particles from settling on the ground. However, the situation has been improving in recent years, with Beijing experiencing its lowest PM2.5 on record in August 2019, and the city is on track to drop out of the top 200 most polluted cities.
| Characteristics | Values |
|---|---|
| Time of year | Winter is mentioned as a time of worse pollution. |
| Time of day | No clear indication, but real-time air quality measurements are available. |
| Yearly trends | Pollution levels have been decreasing over the years, with a notable drop during the 2020 coronavirus pandemic quarantine. |
| Health effects | Air pollution can cause itchy skin, burning lungs, teary eyes, and respiratory issues. |
| Actions taken | Beijing has switched homes and businesses from coal to natural gas, implemented afforestation measures, and invested in electric cars. |
| Recommendations | Sensitive individuals should reduce heavy outdoor exertion during poor AQI levels. |
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What You'll Learn
Beijing's air quality is improving, but it's still poor
Beijing's air quality has improved significantly in recent years, but it still falls below health standards. In 2013, Beijing's PM2.5 levels (fine particulate matter smaller than 2.5 micrometers in size) were recorded at nearly 1,000 μg per cubic meter, which had a severe impact on people's health, especially during the cold seasons.
Since then, Beijing has implemented various measures to improve its air quality. For example, millions of homes and businesses have switched from coal to natural gas, and afforestation measures have been put in place. Beijing also shut down coal-burning steel factories in surrounding cities, restricted the use of charcoal, and banned farmers from burning straw during late autumn. These efforts led to a 33% reduction in PM2.5 concentrations from 2013 to 2017 and a further 10% reduction between 2017 and 2018. In August 2019, Beijing experienced its lowest PM2.5 levels on record, with a reading of 23 micrograms per cubic meter.
However, despite these improvements, Beijing's air quality still does not meet reasonable health standards. In 2022, particle pollution levels were six times greater than the World Health Organization guidelines. Beijing's air pollution is often influenced by sources outside the city, and it continues to experience episodes of poor air quality.
The city's air quality improvements can be attributed to a combination of factors, including the adoption of cleaner technologies, stricter emissions controls on vehicles, and the increased production of electric cars. Beijing's experience serves as a model for other cities struggling with air pollution, demonstrating that significant improvements can be achieved through a combination of policy initiatives, technological advancements, and behavioural changes.
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Particulate matter (PM2.5) is a major concern for health
Beijing has long been known as one of the most polluted cities globally, and particulate matter (PM2.5) is a significant health concern. PM2.5 refers to particulate matter with an aerodynamic diameter of 2.5 micrometres or less. These tiny particles can be inhaled and are known to have adverse effects on human health.
In 2012, Beijing's PM2.5 levels were brought into sharp focus when the city experienced a severe haze episode in January. The highest recorded level of PM2.5 was nearly 1,000 μg per cubic meter, far exceeding the standards of the World Health Organization, the US EPA, and the Chinese EPA. This episode sparked worldwide concern and highlighted the need for stricter air pollution monitoring.
The sources of PM2.5 in Beijing are diverse and include coal combustion, vehicular emissions, and regional transportation. Coal combustion, in particular, has been a major contributor to PM2.5 levels, with its reduction leading to substantial health benefits. However, attention must still be paid to controlling emissions from coal combustion and heavy-duty diesel vehicles in the future.
The health impacts of PM2.5 exposure are significant. Numerous studies have demonstrated strong evidence for the association between PM2.5 and various human illnesses, particularly cardiovascular and respiratory diseases. The wavelet approach has been used to explore the potential link between PM2.5 and influenza in Beijing, suggesting a delay in the occurrence of influenza cases by approximately 1-2 months.
While Beijing has made notable progress in reducing PM2.5 levels, with concentrations falling by 33% from 2013 to 2017 and further improvements since then, it is clear that particulate matter remains a critical health issue. Continuous efforts and investments are necessary to combat this pressing problem and safeguard the well-being of Beijing's residents.
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Car emissions are a significant contributor
Vehicle emissions are a significant contributor to Beijing's air pollution. The combustion of gasoline or diesel fuel in vehicle engines produces harmful chemical emissions, including carbon monoxide (CO), nitrogen oxides (NOx), hydrocarbons (HC), and particulate matter (PM). High traffic flow, particularly in downtown Beijing, exacerbates this issue. Small passenger vehicles dominate central Beijing's traffic, and while the vehicle mix is better than in other regions, with 72% of vehicles meeting "National V" or higher emission standards, there is still room for improvement.
Beijing has implemented several measures to address vehicle emissions. Since 2000, China has upgraded from China I to China V emission standards, with Beijing-Tianjin-Hebei, Yangtze River Delta, and Pearl River Delta achieving the China V fuel standard by the end of 2015. Beijing has also adopted the "one car and one license number" policy to control the number of vehicles by limiting auto licensing. Additionally, the city has explored the concept of zero-emission or ultra-low-emission zones for motor vehicles to improve air quality.
Despite these efforts, Beijing still faces challenges in reducing vehicle emissions. The contribution of motor vehicle emissions to downtown Beijing's air pollution is becoming increasingly significant, with the level of ambient air pollutants in this area higher than in other regions. Further reducing vehicle emissions is necessary to achieve higher air quality goals. Implementing comprehensive policies that consider local conditions, such as the freight transportation structure optimization (FTO) policy, can help mitigate vehicle pollution in Beijing and improve the city's air quality.
It is worth noting that Beijing's air quality has shown signs of improvement in recent years. In August 2019, Beijing experienced its lowest PM2.5 levels on record, and the city is on track to drop out of the list of the top 200 most polluted cities. This improvement can be attributed to various factors, including the switch from coal to natural gas, afforestation measures, and China's position as the world's largest producer of electric cars. However, there is still work to be done to ensure that Beijing's air is safe to breathe for its residents and visitors.
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Beijing's pollution reaches as far as California
Beijing's pollution problem is well-documented. In 2013, the city's municipal government recorded PM2.5 (fine particulate matter smaller than 2.5 micrometers in size) levels of nearly 1,000 μg per cubic meter. These particles, consisting of K+, Ca2+, NO3−, and SO42-, have severe impacts on human health, especially during colder seasons.
While Beijing's air quality has improved in recent years, with PM2.5 concentrations dropping by 33% from 2013 to 2017, the city still faces significant pollution challenges. As of September 3, 2025, Beijing's overall air quality index was 122, with a PM2.5 AQI of 122, indicating that the air quality remains a concern.
The effects of Beijing's pollution extend beyond the city itself. According to the Journal of Geophysical Research, pollution from mainland China reaches as far as Los Angeles, California, in the United States. This long-range transport of pollutants, including sulfur dioxide and nitrogen oxides, contributes to acid rain in cities like Seoul, South Korea, and Tokyo, Japan.
The international reach of Beijing's pollution highlights the global nature of air quality issues. While the Chinese government has implemented measures to reduce pollution, such as investing significant sums to combat urban air pollution, the impacts of these efforts can be felt across borders. As Beijing continues to address its pollution problem, the benefits will likely be experienced not only by its citizens but also by those in distant regions like California.
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The Chinese government is investing in reducing pollution
Beijing's air pollution is notoriously poor, and while the city has seen clearer skies in recent years, it still has a long way to go. The Chinese government has recognised the severity of the problem and is investing in reducing pollution.
In 2013, China's Academy for Environmental Planning pledged $277 billion to combat urban air pollution. This investment has helped China reduce its PM2.5 by 47% between 2005 and 2015, and in 2019, Beijing experienced the lowest PM2.5 on record—a low of 23 micrograms per cubic meter. This is a significant improvement, but China's annual average concentration of PM2.5 in 2017 was still nearly six times higher than the World Health Organisation's acceptable limit.
The Chinese government has also introduced a raft of measures to tackle the problem, including better regulation of polluting activities, relocating factories from populated areas, and providing subsidies to farmers to discourage agricultural burning. In addition, millions of homes and businesses are switching from coal to natural gas, and afforestation measures are being implemented.
The World Bank has also been working closely with the Chinese government to reduce pollution and mitigate climate change. The Innovative Financing for Air Pollution Control Program has supported China's efforts to reduce carbon dioxide emissions by 2.5 million tons per year, and the World Bank has also helped mainstream green financing in financial institutions like Huaxia Bank.
Furthermore, the Chinese government has recognised the importance of technology and big data in tackling air pollution. A pilot project in Cangzhou City aims to harness big data through a platform that detects air pollution hotspots and sends information to enforcement officers via an app.
President Xi Jinping has pledged that China will be carbon neutral by 2060, and the country's actions on air pollution demonstrate its commitment to tackling climate change and creating a more sustainable future.
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Frequently asked questions
Beijing's pollution is caused by car emissions, construction, and industrial activity. While it can vary depending on the season and wind conditions, Beijing's air quality is generally poorest during the colder months.
In 2011-2012, Beijing's air pollution was so severe that the World Health Organization (WHO) had to upgrade their air quality scale. During this period, the air quality index (AQI) exceeded 500, and residents could not see more than 10 meters in front of them.
Beijing's pollution has been described as the "worst air I ever inhale," causing burning lungs, teary eyes, and itchy skin. The high levels of PM2.5, consisting of K+, Ca2+, NO3-, and SO42-, pose significant health risks to residents, especially during the colder seasons.
Beijing has implemented measures to improve air quality, including switching homes and businesses from coal to natural gas and afforestation initiatives. As a result, Beijing's overall pollution levels have decreased, and the city is on track to drop out of the top 200 most polluted cities.
