Brian Barton
Zabol, an Iranian city near the border with Afghanistan, has been identified as one of the world's most polluted cities. Located in the Sistan and Baluchestan province, Zabol is prone to relentless dust storms during the summer, causing severe air pollution and health issues for its residents. The city's proximity to Lake Hamun and the Helmand River, as well as rapid urbanisation and poor water resource management, have contributed to the high levels of pollution. While real-time air quality data is available, varying measurements make it challenging to determine the exact extent of Zabol's pollution problem.
| Characteristics | Values |
|---|---|
| Population | 137,722 (2011 census) |
| Location | Sistan va blouchestan, Iran |
| Pollution Ranking | Ranked as the world's most polluted city in 2016 by WHO |
| Air Quality Index (AQI) | 82 (Moderate) as of March 2, 2025 |
| Worst AQI in 24 hours | 132 (Poor) at 9:14 AM on March 2, 2025 |
| Best AQI in 24 hours | 72 (Moderate) at 4:14 PM on March 2, 2025 |
| Pollution Causes | Dust storms, drought, rapid urbanization, and poor water resource management |
| Health Impact | More than 500 cases of tuberculosis annually due to dust pollution |
| Economic Impact | Loss of 700,000 job opportunities due to wetland crisis |
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What You'll Learn
- Zabol, Iran, was identified as the world's most polluted city in 2016
- The city's air quality is impacted by dust storms and high temperatures
- Zabol's dust storms have been linked to the drying up of the nearby Hamoun wetland
- More than 500 people are diagnosed with tuberculosis in Zabol annually due to dust pollution
- Rapid urbanisation and poor water resource management have contributed to Zabol's pollution
Zabol, Iran, was identified as the world's most polluted city in 2016
The primary cause of Zabol's pollution is the drying up of Hamoun, a nearby wetland area. This ecological crisis has resulted in the displacement of people from nearly 300 villages in the province. Poor water resource management has also contributed to the issue. The pollution in Zabol differs from that of Tehran or Beijing, which is predominantly linked to industrialization. Instead, Zabol's pollution is characterized by high levels of fine particulate matter with a diameter of less than 2.5 microns, known as PM2.5. These particles are stirred up by wind and vehicle movement, among other sources, and have severe respiratory health implications for the population.
The impact of pollution on human health cannot be overstated. According to a report in the Lancet medical journal, approximately 9 million people died due to pollution in 2015, with 4.2 million of those deaths attributed to ambient air pollution. This figure represents 16% of deaths worldwide, exceeding the death toll from diseases like AIDS, malaria, and tuberculosis combined. Zabol's pollution crisis has not gone unnoticed, with more than 500 cases of tuberculosis reported annually due to dust pollution, an unusually high rate for Iran.
To address the issue of air pollution, the World Health Organization (WHO) has established air quality standards. However, as of 2016, over 80% of people living in urban areas were exposed to poor air quality that exceeded these healthy standards. This issue is more prevalent in low- and middle-income countries, where 98% of cities with populations over 100,000 fall short of meeting the WHO's air quality guidelines. The situation in Zabol exemplifies the deadly consequences of pollution and the urgent need for effective pollution control measures.
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The city's air quality is impacted by dust storms and high temperatures
Zabol, a city in the Central District of Zabol County, Sistan and Baluchestan province, Iran, is one of the world's most polluted cities. The city is near the border with Afghanistan and Lake Hamun, in the endorheic Sistan Basin. The region is irrigated by the Helmand River, and Lake Hamun is a seasonal lake that is often dry.
Every summer, Zabol is struck by what is locally known as "120 days of wind", relentless dust storms from north to south. These dust storms are characterised by strong winds carrying large amounts of dust particles over a wide area, reducing visibility and impacting air quality. Dust storms typically form in arid or semi-arid regions with loose soil or sediment, and they can vary in duration from a few hours to several days. Factors such as drought, desertification, and human activities like agriculture or construction can increase the occurrence of dust storms.
Dust storms can significantly degrade air quality by releasing large quantities of particulate matter into the atmosphere. They can also transport pollutants, allergens, and harmful substances, further compromising air quality. The inhalation of fine dust particles can cause respiratory irritation and increase the risk of respiratory infections, especially for individuals with pre-existing respiratory conditions.
In addition to the direct impact of dust storms, the high temperatures in Zabol during the summer can also affect air quality. Heat waves often lead to poor air quality by increasing the amount of ozone pollution and particulate pollution. Rising temperatures can also lengthen the pollen season and increase pollen production, leading to more allergy-related illnesses. Warmer temperatures can also impact the movement of air and pollutants, with warm air near the ground rising and carrying pollutants to higher altitudes.
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Zabol's dust storms have been linked to the drying up of the nearby Hamoun wetland
Zabol, an Iranian city bordering Afghanistan, is one of the world's most polluted cities. The city is afflicted by relentless dust storms every summer, a phenomenon locally known as "120 days of wind". The dust storms are exacerbated by the low water levels of the nearby Hamoun wetland, which straddles the borders of Iran, Pakistan, and Afghanistan.
Once an oasis in the arid landscape of Central Asia, the Hamoun wetlands have dried up due to irrigation and drought. In May 2008, a dust storm arose from the dry lake beds left behind by the once-moist wetlands. The dust appeared especially thick over Gowd-e Zereh, an impermanent salt lake that is the lowest part of the wetlands.
The drying up of the Hamoun wetlands has been identified as a significant contributor to Zabol's pollution crisis. The wetlands, which are a critical ecosystem in the region, have been desiccated by a combination of factors, including irrigation practices and drought. As a result, the area that was once a lush oasis has transformed into a dust storm hotspot, with Zabol bearing the brunt of the environmental fallout.
The impact of the drying up of the Hamoun wetlands extends beyond Zabol's pollution woes. According to Mohsen Soleymani, the national project manager for the preservation of Iranian wetlands, the crisis has led to the disappearance of over 700,000 job opportunities. Additionally, the Iranian daily reported that the situation has forced people to abandon nearly 300 villages in the province. The health consequences are also dire, with more than 500 people diagnosed with tuberculosis in Zabol each year due to dust pollution, an unusually high rate for the country.
The Iranian government has recognized the severity of the issue, with the governor general of Sistan-Baluchestan, Houshang Nazeri, distributing 5,000 air pollution masks to help residents cope with the hazardous air quality. However, a long-term solution to the complex environmental challenges faced by Zabol and the Hamoun wetlands remains elusive.
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More than 500 people are diagnosed with tuberculosis in Zabol annually due to dust pollution
Zabol, a city in eastern Iran, is one of the windiest, dustiest, and most unhealthy urban environments globally. The city is located near Lake Hamun, in the endorheic Sīstān Basin, and is irrigated by the Helmand River. The lake is a seasonal lake that often dries up, and the region has been facing drought and water management issues.
Every summer, as temperatures rise to 40°C and above, Zabol is struck by what is known locally as "120 days of wind", bringing relentless dust storms from north to south. The drying up of Hamoun is the primary reason behind the high levels of dust pollution in the city. The wetland, which once served as a natural cooler for the area, has now almost disappeared due to drought and climate change.
The dust storms in Zabol have disrupted daily life, forcing the closure of schools and government offices. The air pollution caused by these storms has severe health implications for the residents of Zabol. According to a report published by Iran's Shargh daily, more than 500 people are diagnosed with tuberculosis in Zabol annually due to dust pollution, an unusually high rate for the country.
The dust particles contain biological particles, organic compounds, and metals, which have adverse effects on respiratory health. The intensive use of arsenic-based fertilizers and pesticides in the agricultural lands in the Sistan Basin is a likely source of the high arsenic levels found in the dust. Arsenic and chromium pose cancer risks above the safety threshold through ingestion exposure. The dust also negatively impacts the treatment of tuberculosis, increasing the rate of treatment failure, relapse, and the probability of multi-drug-resistant tuberculosis.
The situation in Zabol highlights the critical intersection of environmental degradation and public health risks. It underscores the urgency of implementing appropriate mitigation strategies to reduce dust pollution and protect the well-being of the city's residents.
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Rapid urbanisation and poor water resource management have contributed to Zabol's pollution
Zabol, an eastern Iranian city on the border with Afghanistan, is one of the world's most polluted cities. The city is plagued by poverty and pollution, with annual dust storms disrupting life and closing down schools and government offices. The primary cause of this pollution is the drying up of the nearby Lake Hamoun, which has been exacerbated by poor water resource management.
Rapid urbanisation and population growth have significantly increased water pollution in Zabol and other developing countries. The exponential increase in population has led to a finite available water resource, with over-pumping of groundwater causing depleted groundwater tables and reduced self-cleansing capabilities. Inadequate urban planning and infrastructure have failed to keep pace with population growth, resulting in a lack of access to basic services such as safe drinking water and sanitation for millions of people. This situation poses a severe health risk, particularly in poorer communities, where unsanitary conditions can lead to disease outbreaks such as cholera.
The impact of urbanisation on water quality and management is a complex issue. The expansion of urban areas poses a significant threat to natural dynamics, resource availability, and environmental quality. Inefficient building materials and drainage infrastructure can also contribute to water runoff and localised pluvial flood risk. Additionally, climate change, in combination with urbanisation and poor water management, is worsening water risks. As climate change advances, the demand for water increases, and effective management of this precious resource becomes even more critical.
Poor water resource management has significantly contributed to Zabol's pollution crisis. The drying up of Lake Hamoun, located near Zabol, has been identified as the main reason for the city's pollution. However, the situation has been exacerbated by past mismanagement of water resources. This mismanagement has resulted in the disappearance of job opportunities and forced people to leave their villages. Furthermore, more than 500 people are diagnosed with tuberculosis in Zabol each year due to dust pollution, an unusually high rate for the country.
To address Zabol's pollution crisis, comprehensive and sustainable water management policies are necessary. These policies should be implemented across all sectors, including climate change adaptation, water management, and disaster risk reduction. By improving water-related knowledge and adopting nature-based solutions, Zabol can work towards mitigating the impacts of rapid urbanisation and poor water resource management on its environment and public health.
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Frequently asked questions
Zabol, Iran, was identified by the World Health Organization as the world's most polluted city in 2016. The city is prone to months of dust storms during the summer, with annual mean concentrations of fine particulate matter higher than in any other city worldwide.
The drying up of Hamoun is the main reason behind Zabol's pollution, according to Kaveh Madani, a senior lecturer in environmental management. Other factors include the bad management of water resources, rapid urbanisation, and the city's proximity to the industrial areas of Tehran.
The pollution in Zabol has been linked to a high rate of tuberculosis, with more than 500 people diagnosed each year. The poor air quality also forces the closure of schools and government offices and disrupts life for the city's residents.
