An air treatment method for removing a contaminant is provided, comprising: providing a for treatment air containing the contaminant; providing a plurality of multi-staged non film forming polymer particles having a core polymer and at least one shell polymer; wherein the core polymer accounts for 1 to 25 wt% of the weight of the non film forming polymer particles provided; wherein the multi staged non film forming polymer particles provided each contain a central void; and contacting the multi-staged non film forming polymer particles and the for treatment air; wherein the contaminant is extracted from the for treatment air producing a treated air depleted in the contaminant.
