# Hands On Physics

### Haze

Concepts

HAZE FORMULA

#### AOT = (ln ET - ln signal-((0.139 x m) x (p/1013.25) x m))/m

where,
**ln ET** is the ln of the extraterrestrial constant for the TERC
VHS-1,
**ln signal** is the ln of the signal measured by the TERC VHS-1,
**0.117 **is the AOT caused by Rayleigh scattering in the atmosphere
at 525 nm,
**m** is the air mass, and
**p** is the atmospheric pressure for your location in millibars.

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