Lahore is currently the world's most polluted city, with an AQI of 394, according to air quality monitor, IQAir. IQAir measures air quality based on PM2.5 particle concentration, which poses health risks. Lahore's AQI is 55.6 times above WHO’s safe air quality guideline. An AQI over 100 is unhealthy, while over 150 is deemed ‘very unhealthy.’ WHO air quality guidelines suggest PM2.5 limits of 5 µg/m³ annually and 15 µg/m³ daily, and PM10 limits of 15 µg/m³ annually and 45 µg/m³ daily. These guidelines help governments set air quality standards but are not legally enforceable.
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