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Aravalli Degradation Increases Dust Storm Exposure: 31 of 128 Hills Gone, Delhi Records 2.5 Storm Days in June

Target:UPSC GS-IIIMPSCTeachingSSC GAPrelims HighMains Medium
31 May 2026
~2 min
Source: Indian Express
Key Data:31 hills lost of 1282.5 dust storm days (Delhi, June)0.89 to 1.55 dust-storm days (NW India)35-40 kmph wind threshold
Bodies:Forest Survey of India (FSI)India Meteorological Department (IMD)Wildlife Institute of India (WII)Centre for Ecology Development and Research (CEDAR)Skymet Weather ServicesNASA
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What This Article Covers

1.The Aravalli range intercepts dust-laden winds from the Thar Desert, protecting the Indo-Gangetic plains from severe dust storms.

2.Degradation of the range, including loss of 31 hills and vegetation, is weakening this shield, allowing dust to reach northern plains with lower wind speeds.

3.This has direct implications for disaster management, air quality, and climate vulnerability in North India, linking physical geography with environmental policy.

The Big Picture
Prelims · HighMains · Medium

The Aravalli range acts as a natural barrier, intercepting dust from the Thar Desert before it reaches the Indo-Gangetic plains. However, degradation from mining and deforestation is weakening this shield, leading to increased dust transport to regions like Delhi and worsening air quality, as evidenced by a major storm in Churu, Rajasthan.

Exam Lens

Quick Exam Facts From News

Aravalli Hills Lost (Rajasthan)31 out of 128 (FSI 2018)
Delhi's Dust Storm Days (June)2.5 days (Highest in India)
Dust Storm Frequency (NW India)0.89 to 1.55 days (IMD Atlas)
Critical Wind Speed Threshold35-40 kmph (Now carries dust to plains)

1-Minute Revision

  • ›Aravalli Hills Lost (Rajasthan): 31 out of 128 (FSI 2018)
  • ›Delhi's Dust Storm Days (June): 2.5 days (Highest in India)
  • ›Target this Data: 31 out of 128 Aravalli hills in Rajasthan have disappeared (FSI 2018).
  • ›Target this Nodal Body: Forest Survey of India (FSI) and Wildlife Institute of India (WII) for assessment studies.
  • ›Target this Report: IMD's Climate Hazards and Vulnerability Atlas of India (1981-2010 normals).

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Q1Static LinkageEasy

Which institution's assessment found that 31 out of 128 Aravalli hills in Rajasthan had disappeared?

Q2Statement-basedHard

Consider the following statements regarding the Aravalli range and dust storms:

1. The Aravallis intercept dust-laden westerly winds from the Thar Desert, protecting the Indo-Gangetic plains.

2. According to the IMD's Climate Hazards Atlas, parts of Northwest India average between 2.5 to 3.5 dust-storm days annually.

3. A 2009 study by the Wildlife Institute of India identified 12 critical gaps in the Aravalli range that have expanded due to degradation.

Which of the statements given above is/are correct?

Q3Data-centricMedium

According to the IMD's Climate Hazards Atlas cited in the article, what is the dust-storm frequency range (in days) for the highest frequency class in parts of northwest India?

Q4Application/ImpactMedium

What is a primary consequence of the degradation of the Aravalli range, as highlighted in the news article?

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