Legal Standard EPA Spray Drift Management Regulations

Surface Temperature Inversion

Statutory Definition:

A meteorological condition occurring when a layer of warm air aloft traps cooler, denser air near the ground surface, suppressing vertical thermal convection.

Practical Exam Application:

Extremely hazardous for pesticide spraying: fine aerosol droplets (<150 microns) become trapped in suspended clouds and can drift laterally for miles with light drainage winds.

Official Practice Exam Questions Testing This Concept (1)

What micrometeorological condition occurs during a surface temperature inversion, creating extreme danger of off-target pesticide vapor and fine droplet drift? View Legal Rationale →

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