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This means identifying the wider area where a city's pollution is produced -- its so-called "airshed."

"A significant portion of air pollution stems from sources outside city limits, which requires a shift from city-specific to region-specific emission reduction targets. The establishment of an airshed will be a critical tool for effective air quality management and planning."

According to the World Bank, a regional airshed management policy would involve countries agreeing to set common air quality targets and measures that everyone can implement, meeting regularly to share their experiences and, if possible, setting common air quality standards.

“Everyone started realizing that airshed management is essential if we want to actually solve the problem,” Singh said.

Lahore is in an airshed, an area where pollutants from industry, transportation and other human activities get trapped because of local weather and topography so they cannot disperse easily.