This morning, Dhaka ranked as the fourth most polluted city globally in terms of air quality.

At 9:06 AM today, Dhaka was listed as the fourth most polluted city globally, recording an Air Quality Index (AQI) score of 181.

This statement indicates that Dhaka has been classified as the fourth most polluted city globally based on its Air Quality Index (AQI) score, which was recorded at 181 at 9:06 AM this morning. The AQI is a measure of air pollution levels, with higher scores indicating poorer air quality. Dhaka’s high AQI score suggests significant pollution levels in the city at that particular time.

Dhaka’s air quality was assessed as “unhealthy” by the air quality index.

Dhaka’s air quality fell into the category labeled “unhealthy” according to the Air Quality Index (AQI). The AQI is a numerical scale used to measure and communicate how polluted the air is, with different ranges corresponding to different health risks. In this case, Dhaka’s AQI score of 181 categorizes its air quality as “unhealthy,” indicating that prolonged exposure could have adverse effects on people’s health.

Senegal’s Dakar, Pakistan’s Lahore, and Nepal’s Kathmandu ranked first, second, and third on the list, respectively, with AQI scores of 196, 183, and 181.

When the AQI value falls within the range of 101 to 150 for particle pollution, air quality is categorized as “unhealthy for sensitive groups”; between 150 and 200, it is labeled “unhealthy”; from 201 to 300, it is described as “very unhealthy”; and a reading exceeding 301 is deemed “hazardous”, presenting significant health hazards to residents.

The AQI tells people how clean or dirty the air is in a city each day and what health problems it could cause.
The Air Quality Index (AQI) serves as a daily report card, informing individuals about the cleanliness or pollution levels in the air of a particular city and alerting them to potential health risks associated with the air quality.

In Bangladesh, the Air Quality Index (AQI) is calculated by considering levels of five pollutants: particulate matter (PM10 and PM2.5), NO2, CO, SO2, and ozone.

In Dhaka, the air often becomes dirty and harmful to breathe, especially in winter. But when the rainy season comes, the air usually gets cleaner and healthier.

Dhaka, the capital city of Bangladesh, has faced longstanding challenges regarding air pollution. These issues arise primarily from various sources such as vehicular emissions, industrial activities, construction dust, and biomass burning. During the winter months, typically from November to February, Dhaka experiences severe air pollution episodes. This period is characterized by stagnant weather conditions, low wind speeds, and temperature inversions, which trap pollutants close to the ground, leading to the accumulation of harmful substances in the air.

The pollutants, including particulate matter (PM10 and PM2.5), nitrogen dioxide (NO2), sulfur dioxide (SO2), carbon monoxide (CO), and ozone (O3), reach hazardous levels during this time, significantly impacting air quality. As a result, the air quality deteriorates, often reaching unhealthy or even hazardous levels, posing serious health risks to the residents of Dhaka.

Conversely, during the monsoon season, which typically occurs from June to September, Dhaka experiences a notable improvement in air quality. The monsoon brings heavy rainfall, which helps to cleanse the atmosphere by washing away pollutants and dust particles from the air. Additionally, increased wind speeds and improved dispersion of pollutants contribute to the overall enhancement of air quality during this period.

However, despite the temporary relief brought by the monsoon, Dhaka’s air pollution remains a persistent and pressing issue throughout the year. Addressing this challenge requires comprehensive measures, including stricter regulations on emissions, promotion of cleaner technologies, sustainable urban planning, and public awareness campaigns to mitigate the adverse impacts of air pollution and safeguard the health and well-being of Dhaka’s residents.

According to the World Health Organization (WHO), approximately seven million people across the globe lose their lives each year due to air pollution. This staggering number primarily stems from heightened mortality rates associated with various health conditions such as stroke, heart disease, chronic obstructive pulmonary disease (COPD), lung cancer, and acute respiratory infections.

These conditions are exacerbated by the inhalation of polluted air, which contains harmful substances like particulate matter, nitrogen dioxide, carbon monoxide, sulfur dioxide, and ozone. The detrimental impact of air pollution underscores the urgent need for concerted efforts to reduce emissions and improve air quality worldwide to safeguard public health.

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