Why in the News?

Lahore was declared the world’s most polluted city by air quality monitor IQAir, with an Air Quality Index (AQI) of 394, considered hazardous by global standards.
- Delhi ranks 2nd, recording an AQI of 204, also classified as “very unhealthy.”
- Lahore’s AQI value exceeds the World Health Organisation (WHO) guideline by over 55.6 times.

Primary Causes of Lahore’s Severe Air Pollution:

Stubble Burning: Farmers in Punjab (India and Pakistan) burn crop residue, especially after rice harvesting, during winter to prepare fields for wheat cultivation.
Vehicular Emissions: The rise in the number of vehicles in Lahore, along with the use of low-quality fuel, results in high levels of PM2.5 emissions, a major contributor to air pollution.
Industrial Pollution: Factories and brick kilns in and around Lahore emit harmful pollutants, including particulate matter, adding to the city’s poor air quality.
Geography and Weather Conditions: Lahore’s location in a low-lying region and its geography, surrounded by hills, leads to temperature inversion during the winter, trapping pollutants near the surface and preventing their natural dispersal.
Coal-Fired Power Plants: Large power plants, such as the 1320MW Sahiwal coal-fired power plant in Punjab, part of the China-Pakistan Economic Corridor (CPEC), emit sulphur and other pollutants, significantly contributing to smog and air pollution.

Who Ranks the Most Polluted Cities of the World and How?

IQAir, a Swiss air quality monitoring company, ranks the most polluted cities based on real-time air quality data.
The rankings focus on the concentration of PM2.5 particles, which are small enough to penetrate the lungs and pose serious health risks.
Cities are ranked using the AQI scale (0-500), with AQI above 300 indicating hazardous pollution levels.
IQAir uses data from government agencies, monitoring stations, and low-cost sensors across various regions.
Real-time monitoring allows IQAir to provide up-to-date information about air pollution levels in cities around the world.
The data is compared with WHO standards, which recommend PM2.5 levels below 5 micrograms per cubic meter for healthy air quality.

PYQ:

[2021] Describe the key points of the revised Global Air Quality Guidelines (AQGs) recently released by the World Health Organisation (WHO). How are these different from its last update in 2005? What changes in India’s National Clean Air Programme are required to achieve revised standards?

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Why in the News?

Primary Causes of Lahore’s Severe Air Pollution:

Who Ranks the Most Polluted Cities of the World and How?

PYQ:

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