Category Day (CD) For Smoke Management

CD Ventilation Rate Guideline

  • I <14,500 No Burn
  • II 14,500 โ€“ 29,000 No burn until Inversion has Lifted
  • III 29,000 โ€“ 58,000 Daytime only
  • IV 58,000 โ€“ 117,000 Anytime
  • V >117,000 Excellent smoke dispersion

Calculations for Category Day

Multiply mixing height X transport speed.

Example:
Mixing height = 6,000
Transport speed = 8 mph
6,000 X 8 = 48,000 = Category III
Daytime burning only.