Dust storms drag New Delhi air quality back to dangerous levels

Air quality in New Delhi plummeted to unhealthy levels on Thursday, putting residents at risk, mainly due to dust storms from western parts. PM level had crossed dangerous level, leading quality of air to drop down to "unhealthy" category. Air quality has worsened in New Delhi in recent years. Authorities warned the dusty conditions are likely to prevail for another 3-4 days and advised people to avoid staying outdoors for long hours.