According to local weather department officials, the dip in temperature and lesser wind conditions have resulted in the suspension of particulate matter in the air.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/air-likely-remain-hazy-days-ahead
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-chandigarh
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chandigarh
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/punjab
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/haryana
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture