BHP Correction Factor (\(K_d\)):

\[ K_d = \left(\frac{1013}{P_b}\right)^{0.65} \times \left(\frac{T + 273}{293}\right)^{0.5} \]

Where:

• \(K_d\) is the BHP correction factor.
• \(T\) is the ambient air temperature, °C.
• \(P_b\) is the total atmospheric pressure, mb.