Modifiers matching atmosphere:

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

Simple categories matching clean:

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