Helena Joyce
Shanghai, China, is a city that has experienced issues with air pollution. The air quality is generally acceptable, but sensitive groups may experience symptoms such as throat irritation and difficulty breathing. The main pollutant is often PM2.5, which is produced by human activities such as combustion processes and the conversion of gas pollutants. In 2022, Shanghai had a moderate air quality rating, with a US AQI reading of 97. The World Health Organization suggests a target figure of 5 µg/m³, while Shanghai's PM2.5 level was 34 µg/m³, almost seven times higher than the recommended level.
| Characteristics | Values |
|---|---|
| Main Pollutant | PM2.5 |
| PM2.5 Level | 34 µg/m³ (June 2022) |
| WHO Target Figure for PM2.5 Level | 5 µg/m³ |
| Air Quality Index (AQI) | 106 (Poor) |
| Real-time AQI Level | 138 (Poor) on 9 April 2025 |
| Real-time PM2.5 Level | 37µg/m³ |
| Real-time PM10 Level | 63µg/m³ |
| Real-time Temperature | 19°C |
| Air Quality Map Colour | Dark Yellow (Moderate) in Q2 2022 |
| Sources of PM2.5 | Anthropogenic emissions, combustion of fossil fuels, biomass, waste incineration, gaseous pollutants, road dust, construction dust, industrial dust, kitchen fumes, natural sources |
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What You'll Learn
- The main pollutant is PM2.5, which is almost seven times higher than the WHO's recommended level
- Industrial zones and power stations are areas of high pollution
- Natural processes, such as forest fires, produce PM2.5
- Human activity, such as combustion of fossil fuels, emits PM2.5
- Shanghai's air quality is unhealthy for sensitive groups, who should reduce time spent outside
The main pollutant is PM2.5, which is almost seven times higher than the WHO's recommended level
Shanghai's air pollution is mainly caused by PM2.5, or fine particulate matter, which are tiny particles or droplets in the air that are 2.5 micrometres or less in width. To put this into perspective, the average human hair is about 70 micrometres in diameter, making a single PM2.5 particle 30 times smaller. These particles are so small that they can be inhaled and cause serious health problems. They can get deep into your lungs, and some may even enter your bloodstream.
PM2.5 particles are primarily produced by anthropogenic emissions, such as the combustion of fossil fuels (coal, gasoline, diesel), biomass (straw, firewood), and waste incineration. They are also emitted from construction sites, unpaved roads, fields, smokestacks, and fires. Additionally, certain gas pollutants, such as sulphur dioxide, nitrogen oxides, ammonia, and volatile organic compounds, can be converted into PM2.5 in the air under the influence of ultraviolet light.
The health risks associated with PM2.5 exposure are significant. Short-term exposures have been linked to premature mortality, increased hospital admissions for heart or lung-related issues, acute and chronic bronchitis, asthma attacks, respiratory symptoms, and restricted activity days. Long-term exposure to PM2.5 has been associated with reduced lung function growth in children and an increased risk of premature death, particularly in individuals with pre-existing heart or lung diseases.
In June 2022, Shanghai's air quality was rated as "Moderate," with a US AQI reading of 97. The main pollutant was PM2.5, which recorded a level of 34 µg/m³. According to the World Health Organization (WHO), the recommended target figure for PM2.5 is 5 µg/m³. This means that Shanghai's PM2.5 levels were almost seven times higher than the recommended level. Such high pollution levels can have adverse effects on the health of residents, particularly those sensitive to poor air quality.
To protect themselves from the harmful effects of PM2.5 pollution, residents are advised to stay indoors with doors and windows closed to prevent dirty air from entering their homes. Sensitive individuals should also limit their time spent outdoors until air quality improves.
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Industrial zones and power stations are areas of high pollution
Shanghai's air quality is impacted by industrial zones and power stations, which are areas of high pollution due to their emissions and the nature of their activities. These zones contribute to the overall pollution levels in the city, which are a concern for the health and well-being of residents.
Shanghai's air quality is monitored through an index that measures various pollutants, including PM2.5 (fine particulate matter), PM10 (respirable particulate matter), NO2 (nitrogen dioxide), SO2 (sulfur dioxide), CO (carbon monoxide), and O3 (ozone). In May 2025, Shanghai's overall air quality index was 61, with the main pollutant being PM2.5, which had a level of 34 µg/m³. This level is significantly higher than the WHO's recommended target of 5 µg/m³.
Industrial zones and power stations are significant contributors to the high levels of pollution in Shanghai. The activities and processes within these areas release various pollutants into the air, including those measured by the air quality index. For example, combustion processes and fossil fuel usage, common in industrial zones and power stations, emit PM2.5 and gaseous pollutants such as nitrogen oxides and sulfur dioxide.
Additionally, China's overreliance on coal as an energy source contributes to the pollution levels in Shanghai and the country as a whole. Coal-fired power plants are the largest contributor to CO2 emissions, and they also produce sulfur dioxide, which leads to acid rain. The increase in the construction of coal-fired power plants, as reported by news sources, indicates that this issue may persist or worsen without significant changes.
The pollution from industrial zones and power stations has tangible health impacts on Shanghai's residents. Air pollution has been linked to various diseases, including stroke, heart disease, lung cancer, chronic obstructive pulmonary disease, and respiratory infections. It is a leading cause of death, with approximately 2 million deaths attributed to air pollution in China annually.
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Natural processes, such as forest fires, produce PM2.5
While air pollution in Shanghai is largely attributed to anthropogenic emissions, natural processes also play a role in producing PM2.5, or fine particulate matter. These natural sources include wind-blown dust, volcanic ash, forest fires, floating sea salt, pollen, fungal spores, and certain bacteria.
Forest fires, in particular, are a significant contributor to PM2.5 levels. Wildfires emit fine particulate matter that adversely affects human health, with research indicating that wildfire smoke impacts respiratory health more severely than fine particles from other sources. Toxicological studies suggest that wildfire particulate matter may be more toxic than equal doses of ambient PM2.5, leading to increased respiratory hospitalizations.
The health risks associated with PM2.5 exposure are well-documented. Long-term exposure to outdoor fine particulate matter is the largest environmental risk factor for human health, with an estimated 4.1 million attributable deaths worldwide in 2019. Older adults with chronic heart or lung disease, children, and asthmatics are the most vulnerable to the adverse health effects of PM2.5. Children's developing lungs are particularly susceptible, with reduced lung growth and smaller lungs at age 18 observed in children exposed to high levels of PM2.5.
In addition to forest fires, natural processes such as wind can disturb dust, volcanic ash, and sea salt, contributing to PM2.5 levels. Volcanic ash, in particular, can be carried over long distances and reach high altitudes, potentially impacting air quality in downwind regions.
While natural processes contribute to PM2.5 levels, it is important to recognize that anthropogenic activities, such as combustion processes and industrial activities, are significant drivers of air pollution in Shanghai and other urban areas. The interaction between natural and anthropogenic sources of PM2.5 influences the overall air quality and can have varying impacts on human health.
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Human activity, such as combustion of fossil fuels, emits PM2.5
Shanghai's air pollution is largely attributed to human activity, particularly the combustion of fossil fuels, which emits PM2.5 (fine particulate matter). This includes the burning of coal, gasoline, and diesel, which contributes to the city's poor air quality. While natural processes also produce PM2.5, human-made sources are a significant concern. Direct emissions from combustion processes, such as fossil fuel usage, are a primary source of PM2.5 in Shanghai.
The impact of human activity on Shanghai's air quality is evident from the data. In May 2025, Shanghai's PM2.5 levels were recorded at 61 on the Air Quality Index (AQI), exceeding the World Health Organization's (WHO) recommended target of 5 µg/m³. This level is considered unhealthy, particularly for sensitive groups, who may experience symptoms such as difficulty breathing and throat irritation. To put this into perspective, the US AQI reading for Shanghai in June 2022 was 97, with PM2.5 levels at 34 µg/m³, almost seven times higher than the WHO's target.
Fossil fuel combustion is not the only human activity contributing to Shanghai's air pollution. Other anthropogenic sources of PM2.5 include road dust, construction dust, industrial dust, and kitchen fumes. These sources, combined with fossil fuel emissions, have led to Shanghai's air quality being consistently ranked as "Moderate" or worse on air quality maps. Industrial zones and power stations, in particular, are often associated with high levels of pollution due to the nature of their activities.
To address the issue of air pollution in Shanghai, it is crucial to reduce emissions from fossil fuel combustion and other anthropogenic sources. This may involve transitioning to cleaner energy sources, implementing stricter emission controls, and promoting sustainable practices in industrial and power generation sectors. Additionally, individuals can contribute by reducing their personal fossil fuel usage, such as opting for electric vehicles and energy-efficient appliances, and by advocating for policies that prioritize clean air and public health.
Overall, human activity, including the combustion of fossil fuels, plays a significant role in Shanghai's air pollution. By understanding the sources of PM2.5 and taking collective action, it is possible to improve the city's air quality, creating a healthier environment for all residents and reducing the impact of human activities on the atmosphere.
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Shanghai's air quality is unhealthy for sensitive groups, who should reduce time spent outside
Shanghai's air quality is often unhealthy for sensitive groups, who should reduce the time they spend outside. The city's air pollution is caused by a range of factors, including industrial zones, power stations, combustion processes, road dust, construction dust, and kitchen fumes.
For example, in April 2025, Shanghai's Air Quality Index (AQI) was 106, classified as "poor". The main pollutant was PM2.5, with a level of 37 µg/m³. The World Health Organization (WHO) suggests a target figure of 5 µg/m³, so Shanghai's level was seven times higher than recommended. With such high pollution levels, sensitive groups should limit their time outdoors and stay inside with the windows closed.
In June 2022, Shanghai's air quality was also described as "moderate," with a US AQI reading of 97. Again, the main pollutant was PM2.5, with a level of 34 µg/m³—almost seven times higher than the WHO's recommended level. At this time, those sensitive to poor air quality were advised to restrict their time outdoors.
Shanghai's air pollution levels have been monitored by various organizations, including Plume Labs, AccuWeather, and IQAir, which provide real-time data and maps of the city's air quality. These maps typically use colours to indicate the level of air pollution, ranging from pale green for good air quality to dark maroon for hazardous air quality.
The air pollution in Shanghai has been a persistent issue, with annual PM2.5 air pollution levels recorded from 2013 to 2023. Sensitive groups should be particularly aware of the air quality levels and take appropriate measures to protect their health when necessary.
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Frequently asked questions
There are many factors that contribute to air pollution in Shanghai. Some of the main sources of air pollution include industrial zones, power stations, combustion of fossil fuels, waste incineration, road dust, construction dust, industrial dust, and kitchen fumes.
The main pollutant in Shanghai is often PM2.5, which is a fine particulate matter that can be directly emitted by humans or formed from other gas pollutants under ultraviolet light.
The AQI in Shanghai varies and can fluctuate daily. On April 8, 2025, the AQI was recorded to be 106, which is considered "Poor".
When the AQI is poor, it is recommended to limit outdoor activities, stay indoors with doors and windows closed, and use an air purifier to clean indoor air. Sensitive groups may experience symptoms such as difficulty breathing or throat irritation and should take extra precautions.
There are several sources that provide real-time air pollution data for Shanghai, including the Shanghai Environment Monitoring Center, the China National Urban Air Quality Real-time Publishing Platform, and the U.S. Consulate Shanghai Air Quality Monitor. Additionally, there are air quality maps and plugins available online that provide real-time data and can help identify areas of high pollution.
