Question

what is known as loo?

Answer 1

The Loo (Hindi: लू, Urdu: لُو‎, Punjabi Gurmukhi: ਲੂ) is a strong, dusty, hot and dry summer windfrom the west which blows over the western Indo-Gangetic Plain region of North India and Pakistan.[1] It is especially strong in the months of May and June. Due to its very high temperatures (45 °C–50 °C or 115 °F–120 °F), exposure to it often leads to fatal heatstrokes.[1]

Since it causes extremely low humidity and high temperatures, the Loo also has a severe drying effect on vegetation leading to widespread browning in the areas affected by it during the months of May and June.
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Answer 2

Loo is hot dusty dry wind, some of them called sandstorms which blow particularly in the month of May and June in the northern plains.