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Culture

Top 10 worst cities for smog

Beijing is covered in smog again, but the Chinese capital isn't the only big city suffering from this problem at the moment. From Asia to the Middle East to the Americas, here's a look at the 10 worst cities for bad air.

  • Smog in Beijing

    Beijing, China

    The Chinese capital has been suffering again from smog this winter with residents forced to wear masks outdoors. But, according to the most recent figures from the World Health Organization (WHO), the megacity doesn't even rank among the top 10 cities for smog. Most of the worst afflicted are smaller cities across the developing world.

  • View of the river in Ahwaz, Iran

    Ahwaz, Iran

    The city of Ahwaz ranks worst on the WHO's list when it comes to smog, making it, officially, the city with the dirtiest air in the world. The reason is the amount of heavy industry in the city, which uses oil, metals and natural gas in its production processes.

  • Ulan Bator, Mongolia

    Ulan Bator, Mongolia

    Ulan Bator is not only one of the coldest capitals on earth, it's also the city with the second worst air pollution worldwide. During the winter months, domestic fireplaces with coal and wood contribute up to 70 percent of the smog in the city.

  • A cyclist cycles through smog in Lahore

    Lahore, Pakistan

    Air pollution is one of Pakistan's main environmental concerns at the moment. The situation is particularly dramatic in the country's second largest city, Lahore. The smog is caused primarily by the high volume of road traffic, rubbish incineration and dust from the surrounding deserts.

  • City traffic in New Delhi

    New Delhi, India

    In the nearly 10 million-strong city of New Delhi, the number of cars has increased from 180,000 to 3.5 million in the last 30 years. Still, it's the city's coal powered plants that are causing the biggest problem. They contribute to around 80 percent of the total air pollution in the city.

  • A sandstorm forms over Riyadh

    Riyadh, Saudi Arabia

    Sandstorms, like here in Riyadh, can contribute to smog forming because they increase the amount of particles in the air. In a place like Saudi Arabia, the intense ultra-violet rays also transform transport and industry emissions into ozone.

  • Skyline in Cairo

    Cairo, Egypt

    The poor air quality in Cairo causes a number illnesses among city residents, like chronic respiratory problems and lung cancer. The reason for the air pollution is an increase in road traffic and the booming industrial sector.

  • Street scene in Dhaka

    Dhaka, Bangladesh

    According to a study by the Max-Planck Institute in Mainz, some 15,000 people die every year in Dhaka due to air pollution. Researchers found the world's highest concentration of sulfur dioxide there.

  • Smog in Moscow

    Moscow, Russia

    Even if it looks the same the world over, smog is different, depending on the city. Smog in Moscow, for instance, is characterized by high amounts of hydrocarbons. The westerly winds which regularly blow across Moscow mean that the western part of the city generally has better air quality.

  • Smog over Mexico city with volcano in the background

    Mexico City, Mexico

    The smog in Mexico City is made worse by the geographical location. The city is surrounded on three sides by mountains. Due to the high levels of sulfur dioxide and hydrocarbons in the air, Mexico City was long considered one of the most polluted cities in the world. The situation is now improving due to new transport policies and certain factories being shutdown.


  • Smog in Beijing

    Beijing, China

    The Chinese capital has been suffering again from smog this winter with residents forced to wear masks outdoors. But, according to the most recent figures from the World Health Organization (WHO), the megacity doesn't even rank among the top 10 cities for smog. Most of the worst afflicted are smaller cities across the developing world.

  • View of the river in Ahwaz, Iran

    Ahwaz, Iran

    The city of Ahwaz ranks worst on the WHO's list when it comes to smog, making it, officially, the city with the dirtiest air in the world. The reason is the amount of heavy industry in the city, which uses oil, metals and natural gas in its production processes.

  • Ulan Bator, Mongolia

    Ulan Bator, Mongolia

    Ulan Bator is not only one of the coldest capitals on earth, it's also the city with the second worst air pollution worldwide. During the winter months, domestic fireplaces with coal and wood contribute up to 70 percent of the smog in the city.

  • A cyclist cycles through smog in Lahore

    Lahore, Pakistan

    Air pollution is one of Pakistan's main environmental concerns at the moment. The situation is particularly dramatic in the country's second largest city, Lahore. The smog is caused primarily by the high volume of road traffic, rubbish incineration and dust from the surrounding deserts.

  • City traffic in New Delhi

    New Delhi, India

    In the nearly 10 million-strong city of New Delhi, the number of cars has increased from 180,000 to 3.5 million in the last 30 years. Still, it's the city's coal powered plants that are causing the biggest problem. They contribute to around 80 percent of the total air pollution in the city.

  • A sandstorm forms over Riyadh

    Riyadh, Saudi Arabia

    Sandstorms, like here in Riyadh, can contribute to smog forming because they increase the amount of particles in the air. In a place like Saudi Arabia, the intense ultra-violet rays also transform transport and industry emissions into ozone.

  • Skyline in Cairo

    Cairo, Egypt

    The poor air quality in Cairo causes a number illnesses among city residents, like chronic respiratory problems and lung cancer. The reason for the air pollution is an increase in road traffic and the booming industrial sector.

  • Street scene in Dhaka

    Dhaka, Bangladesh

    According to a study by the Max-Planck Institute in Mainz, some 15,000 people die every year in Dhaka due to air pollution. Researchers found the world's highest concentration of sulfur dioxide there.

  • Smog in Moscow

    Moscow, Russia

    Even if it looks the same the world over, smog is different, depending on the city. Smog in Moscow, for instance, is characterized by high amounts of hydrocarbons. The westerly winds which regularly blow across Moscow mean that the western part of the city generally has better air quality.

  • Smog over Mexico city with volcano in the background

    Mexico City, Mexico

    The smog in Mexico City is made worse by the geographical location. The city is surrounded on three sides by mountains. Due to the high levels of sulfur dioxide and hydrocarbons in the air, Mexico City was long considered one of the most polluted cities in the world. The situation is now improving due to new transport policies and certain factories being shutdown.


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