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air pollution

Posted inFeatures

Urbanization and Air Pollution: Then and Now

by D. D. Parrish and W. R. Stockwell 8 January 201528 October 2022

Analysis of decades of mitigation efforts in Los Angeles demonstrates that air quality in megacities can be greatly improved.

Posted inNews

High Smog Levels Seen in Mecca During the Annual Pilgrimage

by J. Urton 18 December 201424 November 2025

Surveys of air quality show that smog and other pollutants in Islam’s holiest city during the Hajj are among the worst in the world, prompting the Saudi government to look for ways to clear the air.

Posted inFeatures

Crop Residue Burning: A Threat to South Asian Air Quality

by R. P. Singh and D. G. Kaskaoutis 16 September 201420 October 2021

Smoke from the residues, burned during October and November to ready fields for next year’s planting, emanate from Punjab, a region spanning northwestern India and eastern Pakistan.

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