Modifiers matching atmosphere:

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

Simple categories matching innocuous:

• ingredient,
• antigen,
• implement,
• substance,
• item,
• component,
• device,
• material,
• trauma,
• object,
• substrate,
• gas,
• atmosphere,
• form,
• compound,
• part,
• thing,
• entity,
• solid,
• machine,
• carrier,
• particle,
• metal,
• document,
• matter,
• event,
• agent,
• fluid,
• liquid,
• organism,
• papers,
• waste,
• procedure,
• diluent,
• appliance,
• product,
• powder,
• article,
• behavior,
• smell,
• medication,
• creature,
• stimulus,
• drug,
• molecule,
• location,