Hazardous material protocol (small-scale)

Conducting a controlled aerosol experiment requires handling and dispersing a small quantity of sulfur dioxide (SO₂) or other sulfur precursors — materials that pose health and environmental hazards if not managed carefully. The quantities of SO₂ needed are larger than what most atmospheric research groups have previously handled, and the injection methodology (direct release into the stratosphere from aircraft) is novel. Safety protocols must be developed to protect personnel, prevent accidental releases during ground handling and transport, manage potential exposure scenarios, and ensure compliance with environmental regulations.

Establishing rigorous, evidence-based safety protocols before experimentation begins is essential for conducting this research responsibly and for maintaining public confidence in the research program.

This activity involves adapting industry-standard safety protocols for ground-based SO₂ handling across the range of scales anticipated for an aerosol experiment. Additionally, it involves developing protocols for in-flight operations, as well as methods for other sulfur precursor materials, as required. The work includes:

1. Hazard characterization: characterizing hazards associated with handling, transport, and release of SO₂ at the required scales.
2. Ground operations procedures: establishing safe handling procedures for ground operations, including storage, loading, transport, and pre-flight preparation.
3. Emergency response: developing emergency response procedures for accidental releases or exposure scenarios.
4. Risk analysis: conducting hazard assessments and risk analyses specific to the aircraft-based injection methodology.
5. Regulatory compliance: ensuring protocols comply with applicable occupational safety, environmental protection, and aviation regulations.

Safety protocols must be developed in consultation with occupational safety experts, environmental health specialists, and regulatory agencies. The scope includes field testing and validation of proposed procedures at appropriate scales before the aerosol microphysics experiment. Documentation should include standard operating procedures, safety training materials, emergency response guidance, and regular updates as the research program gains experience and scientific understanding improves. This is a foundational activity that must be completed and validated before aerosol microphysics experimentation can proceed, and it will be revisited and updated continuously, including ahead of an aerosol evolution and transport experiment.