Karachi has become the second most polluted city in the world today, followed closely by Lahore in third place, as both of Pakistan’s largest cities face worsening air quality ahead of the winter season. The Indian capital, New Delhi, tops the list with an Air Quality Index (AQI) reading of 252.
Karachi’s AQI stands at 198, while Lahore’s is recorded at 192, marking a troubling trend of rising pollution levels in the region. The AQI measures air pollution on a scale, with ratings between 151 and 200 deemed unhealthy, 201 to 300 is more harmful, and anything above 300 is classified as extremely hazardous.
According to environmental experts, air pollution worsens during winter as colder air traps pollutants closer to the ground, creating a dense layer of harmful particles, including carbon and smoke.
Experts explain that emissions from factories and burning coal, garbage, and tires contribute significantly to pollution. As winter approaches, this smoke becomes more concentrated, creating a toxic atmosphere that lingers until the season ends.
In Karachi, the situation is somewhat mitigated by the southwestern winds from the sea, which act as a natural air filter. However, these winds weaken during winter, reducing their ability to clear the air.
In a related development, Punjab authorities have recently announced changes in school timings due to the worsening smog conditions in Lahore. The adjustment comes as a precautionary measure to protect students from the harmful effects of pollution, particularly during peak hours when air quality is at its worst.