Smog events

Laki () or Lakagígar (, Craters of Laki) is a volcanic fissure in the western part of Vatnajökull National Park, Iceland, not far from the volcanic fissure of Eldgjá and the small village of Kirkjubæjarklaustur. The fissure is properly referred to as Lakagígar, while Laki is a mountain that the fissure bisects. Lakagígar is part of a volcanic system centered on the volcano Grímsvötn and including the volcano Þórðarhyrna. It lies between the glaciers of Mýrdalsjökull and Vatnajökull, in an area of fissures that run in a southwest to northeast direction.

1952 air pollution event in London, England

series of natural disasters in Russia

layer of air pollution that recurrently covers the northern Indian Ocean, India, and Pakistan

Major Pennsylvania air pollution incident

Epidemic of asthma caused by air pollution in Japan

air-pollution event in New York City that occurred from November 23–26

1930 natural disaster