An air treatment article, comprising: a semipermeable barrier and a plurality of non-film forming polymer abatement particles; wherein the non-film forming polymer abatement particles provided are multi-staged particles comprising: a core polymer and at least one shell polymer; wherein the core polymer accounts for 1 to 25 wt% of the non-film forming polymer abatement particles; wherein the core polymer comprises, as polymerized monomer units, 50 to 100 wt%, based on the weight of the core polymer, of at least one type of monoethylenically unsaturated core monomer containing a single carboxylic acid group; wherein the at least one shell polymer comprises, as polymerized monomer units: 10 to 50 wt%, based on the weight of the at least one shell polymer, of at least one type of multiethylenically unsaturated shell monomer; and 50 to 90 wt%, based on the weight of the at least one shell polymer, of at least one type of monoethylenically unsaturated shell monomer; wherein the non-film forming polymer abatement particles provided each contain a central void, wherein the non-film forming polymer abatement particles provided have an average void fraction of 1 to 70 vol%; wherein the semipermeable barrier is disposed between an air atmosphere and the non-film forming polymer abatement particles; wherein the semipermeable barrier impedes passage therethrough by the non-film forming polymer abatement particles; wherein the semipermeable barrier permits passage therethrough by a for-treatment air containing a contaminant such that the for-treatment air can make contact with the non-film forming polymer abatement particles; wherein the non-film forming polymer abatement particles have an affinity for the contaminant, wherein the contaminant comprises at least one of acetaldehyde, d-limonene, an aromatic, a pyridine, a pyrazine, 1-octen-3-ol, 3-methylfuran, 2-pentanol, 2-hexanone, 2-heptanone, 3-octanone, 3-octanol, trans-2-octen-1-ol, cis-2-octen-1-ol, 1-octene, 2-pentanone, 2-nonanone, borneol, geosmin, 1-butanol, 3-methyl-1-butanol, 3-methyl-2-butanol and thujopsene; and wherein the non-film forming polymer abatement particles are a free flowing powder. a semipermeable barrier and a plurality of non-film forming polymer abatement particles; wherein the non-film forming polymer abatement particles provided are multi-staged particles comprising: a core polymer and at least one shell polymer; wherein the core polymer accounts for 1 to 25 wt% of the non-film forming polymer abatement particles; wherein the core polymer comprises, as polymerized monomer units, 50 to 100 wt%, based on the weight of the core polymer, of at least one type of monoethylenically unsaturated core monomer containing a single carboxylic acid group; wherein the at least one shell polymer comprises, as polymerized monomer units: 10 to 50 wt%, based on the weight of the at least one shell polymer, of at least one type of multiethylenically unsaturated shell monomer; and 50 to 90 wt%, based on the weight of the at least one shell polymer, of at least one type of monoethylenically unsaturated shell monomer; wherein the non-film forming polymer abatement particles provided each contain a central void, wherein the non-film forming polymer abatement particles provided have an average void fraction of 1 to 70 vol%; wherein the semipermeable barrier is disposed between an air atmosphere and the non-film forming polymer abatement particles; wherein the semipermeable barrier impedes passage therethrough by the non-film forming polymer abatement particles; wherein the semipermeable barrier permits passage therethrough by a for-treatment air containing a contaminant such that the for-treatment air can make contact with the non-film forming polymer abatement particles; wherein the non-film forming polymer abatement particles have an affinity for the contaminant, wherein the contaminant comprises at least one of acetaldehyde, d-limonene, an aromatic, a pyridine, a pyrazine, 1-octen-3-ol, 3-methylfuran, 2-pentanol, 2-hexanone, 2-heptanone, 3-octanone, 3-octanol, trans-2-octen-1-ol, cis-2-octen-1-ol, 1-octene, 2-pentanone, 2-nonanone, borneol, geosmin, 1-butanol, 3-methyl-1-butanol, 3-methyl-2-butanol and thujopsene; and wherein the non-film forming polymer abatement particles are a free flowing powder.