First thing first, get the CABIN AIR FILTER which gets installed behind the glove box in the interior. its a MUST HAVE FILTER which Honda fails to provide it in the car when you buy it.
you can buy the original filter from Honda Dealership, as this filter filters the air coming inside your cabin in shape of air condition.
otherwise you will get diesel and dirt when you are using air condition. its cost is around 2500 rupees. onyl buy it from your Honda Dealership they know where it fits and how necessary it is.