Modifiers matching atmosphere:

• inert,
• protective,
• carbonaceous,
• dry,
• isolated,
• saturated,
• innocuous,
• extraneous,
• cool,
• rarefied,
• rich,
• explosive,
• chemical,
• dense,
• flammable,
• harmful,
• wet,
• active,
• single,
• solar,
• surrounding,
• outer,
• alkaline,
• working,
• indoor,
• corrosive,
• hazardous,
• severe,
• controlled,
• diffusing,
• smoky,
• special,
• inexpensive,
• gaseous,
• neutral,
• planetary,
• closed,
• heavy,
• reactive,
• qualified,
• industrial,
• pure,
• vital,
• warm,
• tropical,
• molecular,
• thick,
• oxidative,
• bad,
• outdoor,
• dynamic,
• dangerous,
• clean,

Simple categories matching clean:

• particle,
• facility,
• surface,
• item,
• property,
• stone,
• comestible,
• tubing,
• container,
• dressing,
• material,
• sand,
• runoff,
• industry,
• area,
• vessel,
• liquid,
• technology,
• object,
• procedure,
• service,
• metal,
• part,
• supply,
• location,
• substrate,
• production,
• fuel,
• equipment,
• ingredient,
• vegetable,
• article,
• corpus,
• work,
• semiconductor,
• linen,
• veggie,
• garment,
• territory,
• gemstone,
• lake,
• waterway,
• uniform,
• abrasive,
• matter,
• aggregate,
• piece,
• tool,
• debris,
• string,
• building,
• substance,
• design,
• solvent,
• fiber,
• salt,
• solid,
• apparel,
• cylinder,
• conduit,
• machine,
• feature,
• atmosphere,
• fish,
• club,
• hay,
• business,
• stain,
• fun,
• floor,
• space,
• food,
• organs,
• gem,
• amp,
• extra,
• jar,
• bedding,
• laundry,
• seed,
• deposit,
• receptacle,
• residue,
• air,
• sport,
• audio,
• plate,
• product,
• gutter,
• cloth,
• furniture,
• environment,
• pollutant,
• medium,
• inside,
• loan,
• clothing,
• thing,
• mixer,
• effort,
• jewel,
• appliance,
• textile,
• screen,
• aroma,
• meat,
• fluid,
• brush,
• sample,
• paper,
• activity,
• line,
• component,
• bones,
• waste,
• system,
• electricity,
• animal,
• source,
• gas,
• device,
• room,
• artifact,
• bird,
• structure,
• fixture,
• hydrocarbon,
• utensil,
• fabric,
• drape,
• green,
• board,
• contaminant,
• water,
• energy,
• sediment,
• bottle,
• wastewater,
• ground,
• grain,
• place,
• instrument,
• lettuce,
• soil,