Modifiers matching impurity:

• interfering,
• off,
• chemical,
• physical,
• airborne,
• coarse,
• microscopic,
• nonpolar,
• heterogeneous,
• volatile,
• common,
• particulate,
• separate,
• sticky,
• initial,
• mobile,
• organic,
• harmless,
• undesired,
• foreign,
• gaseous,
• stubborn,
• mechanical,
• out,
• insoluble,
• homogeneous,
• atmospheric,
• inorganic,
• smaller,
• small,
• minor,
• anionic,
• ionic,
• suspended,
• mental,
• random,
• heavier,
• residual,
• fine,
• colloidal,
• lighter,
• unavoidable,
• little,
• up,
• micro,
• environmental,
• polar,
• light,
• biological,
• dilute,
• active,
• hazardous,
• reactive,
• visible,
• desirable,
• absorptive,
• lightweight,
• natural,
• unwanted,
• corrosive,
• fluid,
• possible,
• soluble,
• minute,
• ordinary,
• dissolved,
• damaging,
• harmful,
• solid,

Simple categories matching atmospheric:

• phenomenon,
• condition,
• science,
• temperature,
• medium,
• property,
• track,
• process,
• material,
• exposure,
• contamination,
• gas,
• interference,
• aggregate,
• boundary,
• particle,
• stuff,
• storm,
• contaminant,
• electricity,
• lifetime,
• event,
• particulate,
• surface,
• feature,
• debris,
• deposit,
• quantity,
• discharge,
• pollutant,
• variable,
• effect,
• connection,
• radiance,
• constituent,
• issue,
• influence,
• energy,
• oxidizer,
• instrument,
• evolution,
• oscillation,
• quality,
• salt,
• research,
• elements,
• nitrogen,
• atom,
• air,
• state,
• compound,
• structure,
• study,
• change,
• wave,
• situation,
• pollution,
• disturbance,
• pressure,
• hazard,
• water,
• component,
• entity,
• region,
• precipitation,
• force,
• aerosol,
• action,
• substance,
• motion,
• circulation,
• agent,
• cyclone,
• characteristic,
• composition,
• input,
• impurity,
• object,
• aspect,
• environment,
• sound,
• control,
• molecule,
• layer,
• movement,
• topic,
• turbulence,
• weather,
• activity,