Severe winter fog has disrupted transport in Delhi on Monday, with more than 70 trains delayed and 25 flights delayed or cancelled. Fog is a severe problem in the Indo-Gangetic Plain every winter, leading to travel disruption across northern India, Nepal and Pakistan. The problem is exacerbated by atmospheric pollution from traffic and heavy industry, which turns natural fog into choking smog. Read more: timesofindia.indiatimes.com
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