Modifiers matching allergen:

• familiar,
• perennial,
• common,
• inhalant,
• airborne,
• systemic,
• allergic,
• relevant,
• active,
• unique,
• indoor,
• identifiable,
• environmental,
• outdoor,
• new,
• microscopic,
• strong,
• unhealthy,
• rare,
• major,
• seasonal,
• typical,
• harmful,
• animal,
• size,
• home,
• harmless,
• american,
• reactive,
• large,
• special,
• potential,
• dietary,
• natural,
• single,
• particular,
• outside,
• additional,
• cutaneous,
• out,
• possible,
• respiratory,
• cereal,
• nasty,
• important,
• individual,
• organic,
• fine,

Simple categories matching airborne:

• unit,
• compound,
• material,
• particle,
• contaminant,
• disease,
• abrasive,
• gas,
• hydrocarbon,
• bacteria,
• substance,
• microorganism,
• thing,
• platform,
• illness,
• toy,
• feeder,
• sound,
• particulate,
• infection,
• insect,
• allergen,
• impurity,
• pm,
• pathogen,
• constituent,
• contagion,
• pest,
• image,
• trauma,
• pollutant,
• condition,
• aldehyde,
• contamination,
• agent,
• conveyance,
• bug,
• hazard,
• aerosol,
• armament,
• germ,
• metal,
• system,
• component,
• prey,
• object,
• vessel,
• pollution,
• event,
• predator,
• debris,
• animal,
• item,
• organism,
• waste,
• craft,
• dust,
• creature,
• sensor,
• matter,
• virus,
• fiber,
• seed,
• chemical,
• medium,
• device,
• vehicle,