Keep cats indoors One of the primary ways to help cats with seasonal allergies is to control the occurrence of allergens in their immediate environment. To control pollen allergies, you will likely need to start by keeping your cat inside during the day to decrease his exposure. Running your air conditioners won't remove any significant amounts of pollen from the air indoors, but it will start to control the amount of pollen in your home because you'll be keeping windows and doors shut. If your cat has mould allergies, you'll have to be extra careful to keep mould growth down in your basement and attic. Spraying fungicides and allowing for adequate ventilation will help.
Houseplants are often good places for moulds to grow.
If you can't get rid of the plants, putting charcoal, the kind you get for aquarium filters-on the soil will help inhibit mould growth. Pillows and mattresses get mouldy, too. Change the bed often and switch to fibre-filled pillows instead of feathers or down ones. Allergies to mould spores are particularly bad in the autumn, when leaves cover the ground and are gathered in clumps outside windows. Moulds grow in damp leaves and cause problems until a long-term cold spell occurs.