Modifiers matching particulate:

• nonmetallic,
• airborne,
• unhealthy,
• natural,
• inorganic,
• suspended,
• fine,
• charged,
• heavy,
• crystalline,
• abrasive,
• unwanted,
• solid,
• smaller,
• metal,
• coated,
• tiny,
• pathogenic,
• supplemental,
• sharp,
• powdered,
• ambient,
• floating,
• small,
• coarse,
• large,
• size,
• larger,
• gross,
• soft,
• dry,
• diverse,
• inert,
• available,
• atmospheric,
• toxic,
• secondary,
• dustlike,
• hazardous,
• foreign,
• liquid,
• indoor,
• insoluble,
• fibrous,
• ceramic,
• hard,
• micro,
• organic,
• biological,
• crustal,
• allergenic,
• silver,
• chemical,
• conductive,
• microscopic,

Simple categories matching gross:

• change,
• abnormality,
• property,
• solid,
• contamination,
• anomaly,
• disorder,
• contaminant,
• measure,
• alteration,
• pollutant,
• error,
• particulate,
• lesion,
• matter,
• material,
• aberration,
• recovery,
• condition,
• mutation,
• pathology,
• day,
• event,
• feature,
• form,