A thick blanket of haze enveloped the National Capital on Sunday and the Air Quality Index (AQI) recorded "very poor" levels.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/after-brief-respite-delhi-again-turns-breathless
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/daily-news-analysis-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-index-aqi
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-pollution-control-board-cpcb
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rspm-pm-10