Kiera Jefferson
Mexico City has long suffered from poor air quality, caused by industrialisation, urbanisation, and a population boom. In 1992, the United Nations named Mexico City the most polluted city in the world. While the Mexican government has since implemented policies to reduce air pollution, the city still experiences high levels of smog and harmful pollutants, with air quality alerts issued in 2022. The pollution has severe health, economic, and quality-of-life impacts on residents, and is a particular concern for lower-income communities.
| Characteristics | Values |
|---|---|
| Population | 22 million |
| Air Quality | Ranked 917th most polluted city in the world in 2021 |
| Air Quality Index (AQI) | 55 (Moderate) |
| Primary Pollutants | Carbon Monoxide, Sulfur Dioxide |
| Secondary Pollutants | Ozone, Sulfate |
| Health Effects | Coughing, Shortness of breath, Bronchitis, Respiratory infections, Heart problems, Early death, Reproductive health issues |
| Causes of Pollution | Vehicle emissions, Industrial emissions, Fossil fuel combustion, Population growth, Poor air circulation |
| Measures to Reduce Pollution | Driving restrictions, Incentives for cleaner vehicles, Public transport improvements, Bicycle infrastructure, Closure of polluting factories, Emissions testing, Clean indoor air |
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What You'll Learn
Population growth and industrialisation
Mexico City's population grew rapidly in the 20th century, with industrialization bringing thousands of migrants from across the globe. The population increased from 500,000 in 1900 to 3.1 million in 1950 and 5.5 million in 1960. By 1980, the population had skyrocketed to 14 million, and by the early 21st century, the metropolitan area had a population of around 20 million. This growth was fuelled largely by domestic migration, with people seeking better economic opportunities and escaping poverty in rural areas. The city's role as a major centre for manufacturing and industrialization in Mexico also attracted migrants, with the capital accounting for nearly one-third of the country's manufacturing output in 1940 and half of it by 1960.
The industrialization and population growth in Mexico City went hand in hand, with the city's expanding economy creating more jobs and drawing more people to the area. However, this rapid growth had negative consequences, with the city becoming severely polluted. The proliferation of vehicles, the use of carbon-based fuels, and the emissions from industrial activities all contributed to poor air quality. The topography of Mexico City, located in a basin, also meant that air pollutants were trapped, exacerbating the problem.
The Mexican government has implemented various measures to combat air pollution, including requiring gasoline reformulation, closing or relocating polluting factories, and restricting vehicle use through the "Hoy No Circula" program. These efforts have shown results, with Mexico City dropping to the 917th most polluted city in the world in 2021, according to IQAir. However, the city still faces environmental challenges, and the annual rate of growth of the Metropolitan Area of Mexico City continues to contribute to the problem.
The population growth in Mexico City has also resulted in urban expansion, with the city spreading outwards into neighbouring states. This expansion has led to the development of peri-urban zones, which are transition areas between rural and urban landscapes. These peri-urban zones are characterized by high urban growth rates and the establishment of informal settlements by poor residents, contributing to the overall population growth and industrialization of the region.
In summary, the population growth and industrialization of Mexico City were closely intertwined, with economic opportunities and industrialization drawing migrants to the city. However, the rapid growth and industrialization also led to severe pollution problems, which the government has been working to address. While improvements have been made, the continued population growth and urbanization pose ongoing challenges for the environment and the city's development.
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Vehicle emissions
Mexico City's air pollution was once so severe that in 1992, the United Nations declared it the "most polluted city on the planet". A range of factors contributed to this, including the proliferation of vehicles, rapid industrial growth, and a population boom. The number of vehicles in Mexico City has been steadily increasing, with 124 cars and light-duty trucks per 1000 residents in 1980, rising to 267 per 1000 residents in 2010. This increase in vehicles has had a significant impact on air quality, with vehicles emitting various pollutants directly into the environment, such as carbon monoxide and nitrogen dioxide.
To address these issues, the Mexican government implemented several measures. These included requiring the reformulation of gasoline, closing or relocating polluting factories, and prohibiting drivers from using their cars one day a week ("Hoy No Circula"). Additionally, there has been an expansion of public transportation and a push for energy efficiency in motor vehicles. Mexico City has also set goals for future emissions reduction, such as implementing a low-emission zone and accelerating the transition to battery-electric vehicles.
Despite these efforts, air pollution remains a concern in Mexico City. The latest reports show that light-duty vehicles (LDVs), such as passenger vehicles and taxis, are still a key source of transport emissions, contributing to high levels of ozone and fine particulate matter. The implementation of inspection and maintenance programs and the expansion of incentives to replace high-emitting taxis with lower-emitting models are recommended to further reduce emissions. Ensuring new vehicles have low emissions and improving fuel efficiency are also crucial to combating the city's air pollution crisis.
Overall, while Mexico City has made significant progress in reducing air pollution, vehicle emissions continue to be a challenge. The implementation of policies targeting high-emitting vehicles and the promotion of low-emission technologies are crucial steps towards improving the city's air quality and protecting the health of its residents.
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Poor air quality and health issues
Mexico City's poor air quality has had a significant impact on the health of its residents, and it was once labelled the "most polluted city on the planet" by the United Nations in 1992. The city's rapid industrialization, population growth, and proliferation of vehicles have contributed to high levels of air pollution, with primary and secondary pollutants filling the air.
Primary pollutants, such as carbon monoxide and sulfur dioxide, are emitted directly into the environment, primarily from vehicle emissions and the combustion of fossil fuels. Inhalation of these pollutants can have serious health consequences, including dizziness, brain dysfunction, respiratory issues, and even death. Secondary pollutants like ozone are formed through chemical reactions in the atmosphere and have been linked to respiratory, cardiovascular, and central nervous system problems, as well as reproductive health issues and early death.
The severity of air pollution in Mexico City has had detrimental effects on public health. In 2019, it was ranked as the 48th dirtiest city out of 98, and the poor air quality in the country is estimated to cause about 17,000 deaths annually, including 1,680 children under the age of five. Prolonged exposure to polluted air can lead to permanent health issues, such as accelerated ageing of the lungs, reduced lung capacity, and shortened life expectancy, especially for those with pre-existing heart conditions, pregnant women, children, and the elderly.
To address the health risks associated with poor air quality, the Mexican government has implemented various measures. These include requiring gasoline reformulation, closing or relocating polluting factories, prohibiting driving one day a week, and expanding public transportation. The "Hoy No Circula" policy, introduced in 1989, mandates emissions testing for all vehicles in Mexico City and the state of Mexico every six months, with underperforming vehicles prohibited from being driven on certain days. While these efforts have led to notable improvements in air quality, with Mexico City dropping to the 917th most polluted city in the world in 2021, more work remains to be done to ensure the health and well-being of its citizens.
Additionally, public awareness and education about air quality and monitoring tools are crucial in mitigating the health impacts of air pollution. Surveys have been conducted to assess the level of awareness among residents, and behavioural modifications, such as avoiding outdoor exercise or strenuous activity during periods of poor air quality, can help reduce exposure to harmful pollutants.
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Government policies and initiatives
Mexico City has implemented a range of policies and initiatives to combat air pollution, which was once so severe that birds were found dead due to the toxicity of the air. Recognising the severity of the problem, the Mexican government began developing and implementing comprehensive air quality management programs in the 1990s that combined regulatory actions with technological change. Here are some key government policies and initiatives that have been implemented to address the issue:
Government Policies
- Removal of lead from gasoline and the implementation of catalytic converters in automobiles.
- Reduction of sulphur content in diesel transportation fuel.
- Substitution of fuel oil in industry and power plants with natural gas.
- Reformulation of liquefied petroleum gas used for heating and cooking.
- Implementation of "No-Drive Days" or "Hoy No Circula", which prohibits drivers from using their vehicles one weekday per week (this was later changed to include Saturdays as well).
- Closure of polluting factories or relocation outside the city.
- Improvement of fuel quality for both diesel and gasoline.
- Implementation of an air quality forecasting system to alert the public to high pollution events 24 hours in advance.
Initiatives
- Mexico City has joined the global Breathe Cities initiative, which aims to reduce air pollution by providing cities with access to air quality data and supporting the development of tailored policies and local activities.
- ProAire, which is now in its fourth iteration, ProAire IV, addresses eight themes: reduction of energy consumption, promotion of public transport, technology shift and emissions control, environmental education and sustainability, culture and citizen participation, green areas and reforestation, institutional capacity building, and strengthening of health protection.
- Efficient mass transit, including upgrading high-capacity, low-emission transport systems and improving the maintenance and inspection program for private vehicles.
- Improved solid waste management, including the potential use of landfill gas recovery to supply clean energy, as well as new trash and recycling regulations for residents.
- Energy-efficient buildings, with an intensive program to replace lamps with better technology and a project to convert four public buildings to efficient energy usage.
- Reduced burning of agricultural waste through fire prevention workshops, treatment of controlled burns, and the creation of a buffer zone between agricultural and forest areas.
- Expansion of the city's subway network and bike-sharing initiatives to decrease public reliance on vehicles.
- Implementation of climate change strategic programs, including the use of green energy (e.g. solar panels), energy efficiency programs for public buildings, and sustainable development of natural resources and biodiversity.
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Meteorological factors
Mexico City was once named the world's most polluted city by the United Nations in 1992. The metropolis has since dropped to the 917th most polluted city in the world as of 2021, according to IQAir, a Swiss company that monitors air quality globally. This improvement is attributed to various factors, including governmental initiatives and meteorological conditions.
Mexico City's high altitude of 7382 feet (2250 meters) above sea level contributes to its air quality issues. This altitude results in a 25% decrease in oxygen levels, causing incomplete combustion of carbon-based fuels. The city's topography, situated in a basin, further exacerbates the problem as air pollutants tend to get trapped.
The climate in Mexico City also plays a role in air pollution, particularly during the spring season. The hot and dry weather creates favourable conditions for the formation of ground-level ozone, a primary air pollutant. Ground-level ozone is produced through the interaction of nitrogen oxides (NOx) with volatile organic compounds (VOCs), accelerated by ultraviolet (UV) radiation from the sun.
In addition to the meteorological factors mentioned above, the lengthening of automobile trips due to urban sprawl and the increasing number of vehicles in the city annually contribute to the air pollution issue in Mexico City.
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Frequently asked questions
Mexico City was once named the world's most polluted city by the United Nations in 1992. In 2021, it was ranked as the 917th most polluted city in the world. Its concentration of airborne particles (PM 2.5) exceeds the World Health Organization's guidelines.
The poor air quality is caused by a combination of industrial emissions, vehicle emissions, and unfavourable meteorological conditions. The topography of Mexico City, located in a basin, also traps air pollutants.
Exposure to pollutants such as ozone, nitrogen oxides, and PM 2.5 can cause irritation to the eyes, nose, and throat, as well as coughing, shortness of breath, bronchitis, respiratory infections, and heart problems. Air pollution is estimated to cause about 5.9% of all deaths in the country.
The government has implemented policies such as driving restrictions, incentives for cleaner vehicles, investments in public transport, the creation of bike lanes, and the closure or relocation of polluting factories.
Individuals can limit their time outdoors when air quality is poor, use air purifiers indoors, and follow recommendations from sources like the Air Quality Index (AQI) to protect their health. Using public transportation or opting for cleaner vehicles can also help reduce air pollution.
