Lahore World's Most Polluted City as Smog Worsens

Key takeaways

Lahore topped IQAir’s major-city ranking on Wednesday morning, October 28, with an AQI of 296 at 10am — “very unhealthy”. Punjab’s environment agency is stepping up monitoring, dust suppression and enforcement as colder weather and easterly winds worsen smog.

Conceptual illustration of a city skyline blurred by thick grey-orange smog, with a pale sun behind the haze — Illustration: WHAT TODAY?

Lahore was ranked the world’s most polluted major city on Wednesday morning as smog thickened with the onset of colder weather. According to the live ranking published by Swiss air quality monitoring platform IQAir, the city recorded an Air Quality Index (AQI) of 296 at 10am on October 28, putting it ahead of every other major city on the list at that hour.

Cairo ranked second with an AQI of 289, followed by Delhi at 272. Tashkent stood fourth at 186, while Karachi ranked fifth at 173. Under the United States AQI scale, readings from 201 to 300 are classed as “very unhealthy”, a level at which the risk is greatest for children, older people and those with respiratory or heart conditions. Because IQAir’s ranking is live, positions and readings shift through the day, so Wednesday morning’s top spot is a snapshot at 10am rather than a full-day average.

The worsening air coincided with colder early-morning conditions, when smog reduced visibility in Lahore. Residents were advised to limit prolonged outdoor exertion while pollution levels remain high, particularly those with asthma and other respiratory conditions.

What is driving the smog

Smog in Lahore is a seasonal, multi-source problem, attributed mainly to industrial emissions, vehicular pollution, stubble burning and air movement. It typically intensifies as winter approaches and cooler, stiller air traps pollutants close to the ground.

Environment Protection Agency spokesperson Sajid Bashir told Dawn that authorities were monitoring industries and had installed devices to record pollution levels, and that measures were being taken to prevent stubble burning. Easterly winds had been consistently pushing polluted air from India’s border regions into Lahore, worsening conditions across central Punjab, he said, while development work in the province’s cities was also contributing.

The official response

The government is procuring and installing 30 more modern fog cannons mounted on electric trucks, Bashir said. Anti-smog guns are being deployed first in areas with higher pollution readings, particularly where levels of PM10, the coarser form of particulate matter, are elevated, to suppress dust on roads and in surrounding areas.

Punjab Climate Watch is working in three shifts to monitor industries in Lahore, with teams inspecting for violations, registering cases and imposing fines. Bashir cautioned, however, that measures were being taken to combat smog but “the process would take time”.

Why it matters

Wednesday’s ranking is not an isolated spike. Last week Lahore again ranked as the world’s most polluted city, with its air quality classified as “hazardous”. On October 2 it also topped IQAir’s list, with an AQI of 167, classified as “unhealthy”. And on October 1, an analysis by the European Union’s Copernicus Climate Atmosphere Monitoring Service ranked Lahore among cities whose ozone levels were “extremely poor”.

That pattern is why a single morning’s ranking matters beyond the headline number: the test each year is whether enforcement, dust control and curbs on burning can keep readings from climbing further into the hazardous band as temperatures fall.

What’s next

The immediate question is whether Lahore’s readings stay in the very unhealthy range or climb higher, and whether the new fog cannons and stepped-up inspections make a measurable difference in the worst-affected areas.

For now, the advice remains practical: limit time outdoors when the air is thick, keep exertion indoors on the worst days, and take extra care of children, older relatives and anyone with a breathing or heart condition.