i own a swift Dzire 2012 (new shape). i surprised to found that there is no AC cabin filter installed when car come from showroom. its a very important thing if you drive in a city like Delhi & Gurgaon that have lot of dust & pollution.
i have purchased a new MGP AC Cabin filter from market @ Rs 350.
Open glove box & remove everything from it to make it empty.
now in open position hold it tight & pull it up. it will detach from dashboard.
Now open the cabin filter cover by opening clips from both side as in red square in pic.
now insert filter as per given marks on the filter (have arrow direction upwards ).
& now again fit filter cover & glove box.
Now you can enjoy outside air without dust & pollution.