Interesting - good to know that particular generation of Corolla in your region had a pollen filter.
Here in the North American market - they didn\'t run pollen filters until the 2003 model year, 9th generation Corolla. Those models, the pollen filter sits horizontally over the top of the blower (air pulled down through the filter). Same deal - two spring clips on the side, right behind the glovebox opening.
2002 Corolla S, Silverstream, 1.8L 1ZZ-FE (VVT-i)
2003 Matrix XRS, Cosmic Blue, 1.8L 2ZZ-GE (VVTL-i) - RIP
2009 Matrix XRS, Blue Streak, 2.4L 2AZ-FE (VVT-i)