How you air your bedroom is the same as you must do with your pillows. You need to air them periodically in the summer and winter, as that will keep the dust mites away. That is valid, especially for those bedroom cushions which are made from natural fibres that are more difficult to wash. You could opt for models made from synthetic fibres, as most people choose as these are cheaper, but their quality is questionable, and their lifespan is shorter. Those made of polyester are another model to consider.