Modifiers matching impurity:

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

Simple categories matching atmospheric:

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