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Wednesday, 15 March 2023

Report says Lagos ranks 133rd in world’s most polluted cities

A 2022 World Air Quality Report conducted by IQAir has ranked Lagos State as the 133 world’s most polluted cities (historical data 2017-2022).

In its 2022 report on most polluted city ranking which, according to IQAir, is based on annual average PM2.5 concentration (µg/m³), Lagos was said to be “experiencing some rather poor quality air with a US AQI figure of 160, which classified it as ‘unhealthy’, according to recommended figures from the World Health Organisation” at the beginning of 2021.

Lagos, with an estimated population of the metropolitan area, was 21 million people as of 2018, has a concentration of its PM2.5 pollutant 73.2 µg/m³.

“With a level such as this,” the report says, “it is recommended that a good quality mask is worn when going outside. Doors and windows should be kept closed to prevent the ingress of polluted air into the home. All types of outdoor exercise should be abandoned until air quality improves.”

“Every day, 227 vehicles clog each kilometre of road. Most of these vehicles are over 15 years old and are not equipped with the latest emission technologies. The fuel they use has a very high sulphur content which is 200 times higher than U.S. standards for diesel,” the report added.

Industrial emissions are the second source of air pollution in the city of Lagos. Industrial and commercial zones such as Apapa, Idumota, Ikeja and Odogunyan, where cement, chemicals, furniture, oil refineries, and steel processing industries are concentrated, have high levels of pollution.

“In Odogunyan, a PM2.5 concentration of 1,770 µg/m³ was recorded in 24 hours,” it noted.

The report also noted that half of Lagos’ total energy needs are supplied by generators which are yet another source of air pollution. The poor combustion of the gasoline and oil used to power the generators pollutes the air and could cause huge health damage.

“The use of energy such as charcoal, wood and kerosene in cooking, makes the problem difficult in rural areas due to limited infrastructure and access to clean energy.”

“According to the report, Nigeria is the 10th most polluted country in Africa, with an air pollution rate of 44.8 per cent, followed by Uganda and Ethiopia,” IQAir stated.

In 2018, as a result of an intense study, it was estimated that over 11,200 premature deaths are the direct result of poor air quality. It was also discovered that 60 per cent of that figure was for children under the age of five years.

“Any type of air pollution is detrimental to health, but the worst type of pollutant is the microscopic PM2.5 particles which can easily penetrate the lungs, due to their small size. This study found the levels in Lagos were over 7 times the target figure suggested by the World Health Organisation,” according to IQAir.

In its recommendations, the report called for regular inspections of automobiles to ensure that older cars are not releasing harmful chemicals into the atmosphere. It adds that Nigeria must remove cars that are toxic to the environment from the road.

It stated: “The introduction of efficient electric energy will decrease the need for generators, which produce unhealthy air in households and work environments. Nigeria has access to sustainable energy resources that are capable of providing power to its citizens. These methods are safer for the environment and their usage of them decreases the use of gasoline-powered generators, thus decreasing pollution.

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