Pakistan’s cultural capital, Lahore, has once again been ranked the most polluted city in the world, according to global air quality monitoring data, with air quality levels reaching hazardous concentrations that pose serious health risks for residents. The city’s Air Quality Index (AQI) was recorded in the 400s on Wednesday, well above the threshold considered dangerous for human health.
The ranking comes amid a winter smog season that routinely blankets much of Punjab province, trapping pollutants near the ground and exposing millions to toxic air. Karachi also featured among the more polluted major cities globally, though at significantly lower levels than Lahore.
What the Air Quality Numbers Mean
Air quality is measured on a scale called the Air Quality Index (AQI), which reflects concentrations of fine particulate matter (PM2.5) and other harmful pollutants. An AQI reading above 300 is considered “hazardous,” meaning the air is extremely dangerous to breathe and can aggravate health conditions in people of all ages.
In Lahore’s case this week, the AQI reached 452, placing it at the top of global pollution rankings. This indicates a severe build-up of particulate matter in the air, which can penetrate deep into the lungs and bloodstream.
Winter smog is a recurring problem in the region: farmers often burn crop residue after harvest, while heavy traffic, industry emissions, and construction dust add to the pollution load. Cold weather can also trap pollutants close to ground level, making the air quality much worse than in warmer months.
Health Risks and Public Advisories
Experts and environmental monitoring systems are advising citizens to reduce their time outdoors, close their windows during peak pollution hours, and if possible, use air cleaners in their homes. Masks, especially those designed to filter particulates, are being recommended for citizens forced to go outside.
These groups include children, the elderly, and people with respiratory conditions like asthma and bronchitis. Prolonged exposure to unhealthy air increases the risk of developing conditions like wheezing, coughing, and shortness of breath and contributes to cardiovascular and lung diseases.
Why Lahore’s Situation Keeps Worsening
Lahore regularly ranks high in daily air pollution lists during the winter. Earlier months had already seen the city among the worst in the world, with average AQI levels fluctuating well into the “very unhealthy” range.
Major contributors include:
- Vehicular emissions from millions of cars, trucks, and motorbikes
- Industrial pollution from factories and power plants
- Stubble burning in nearby agricultural areas
- Construction dust and open burning of waste
- Weather conditions that trap pollutants close to population centers
Long-term studies show Lahore’s air pollution routinely exceeds World Health Organization guidelines many times over, a trend shared with other South Asian cities struggling with rapid urbanization.
What’s Being Done
Measures have been taken by the authorities in the past to overestimate the smog problem, for example, anti-smog campaigns through water-spraying trucks, crackdowns on burning of crop residue, among other awareness campaigns. All these actions would result in reduced emissions if done in the right manner by addressing the root cause.
Every year, the city and provincial governments repeat the warnings concerning the consequences of smog, but the cycle of the smog phenomenon seems to repeat itself when the weather turns cold.
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