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The eruption of Mount Pinatubo in the Philippines deposited large amounts of particulate matter into the atmosphere, enough to lower global temperatures by about 0.5 °C (0.9 °F).
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Mount Pinatubo
Active stratovolcano in Luzon, Philippines
Mount Pinatubo is an active stratovolcano in the Zambales Mountains in Luzon in the Philippines. Located on the tripoint of Zambales, Tarlac and Pampanga provinces, most people were unaware of its eruptive history before the pre-eruption volcanic activity in early 1991. Dense…Source: Wikipedia (CC BY-SA)
Particulate matter
Microscopic solid or liquid matter suspended in the Earth's atmosphere
Particulate matter (PM) or particulates are microscopic particles of solid or liquid matter suspended in the air. An aerosol is a mixture of particulates and air, as opposed to the particulate matter alone, though it is sometimes defined as a subset of aerosol terminology.…Source: Wikipedia (CC BY-SA)