Category 2 Smoke allows burning between what hours?

Category 2 Smoke allows burning between what hours?

• A. 0900-1700 EST
• B. 0900-1600 EST
• C. 0700-1300 EST
• D. 1000-1800 EST

Answer: (B)

Category 2 Smoke window is designed to balance smoke dispersion with safe, daylight burn operations. The 9:00 a.m. to 4:00 p.m. EST period is chosen because, during these hours, atmospheric mixing is typically better, helping to dilute smoke and reduce ground-level concentrations. Morning inversions can trap smoke near the surface, and late afternoon or evening conditions often have lower mixing heights and shifting winds, which can cause smoke to linger or move unpredictably. Operating in the 9–4 window keeps smoke more manageably dispersed, supports visibility and safety for crews, and aligns with monitoring and regulatory guidelines.

Category 2 Smoke window is designed to balance smoke dispersion with safe, daylight burn operations. The 9:00 a.m. to 4:00 p.m. EST period is chosen because, during these hours, atmospheric mixing is typically better, helping to dilute smoke and reduce ground-level concentrations. Morning inversions can trap smoke near the surface, and late afternoon or evening conditions often have lower mixing heights and shifting winds, which can cause smoke to linger or move unpredictably. Operating in the 9–4 window keeps smoke more manageably dispersed, supports visibility and safety for crews, and aligns with monitoring and regulatory guidelines.