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Table 2 Occupational exposure standards for substances that may be utilized in solar radiation management (Unless otherwise specified, exposure limits are average levels over an 8-h workday)

From: Assessing the direct occupational and public health impacts of solar radiation management with stratospheric aerosols

Substance U.S Occupational Safety and Health Administration (mg/m3)a U.S National Institute for Occupational Safety and Health (mg/m3)a American Conference of Governmental Industrial Hygienists (mg/m3)a
Sulfuric acid 1 1 0.2
Sulfur dioxide 13 5.2 0.7b
  -- 13.1b --
Hydrogen Sulfide 27.9c 13.9c 1.4
  60.7d -- 7.0b
Carbonyl Sulfide - - 12.3
Black carbon 3.5 3.5 3
Aluminum aerosol 15 10 1e
  5e 5e --
Aluminum oxide 15 - -
  5e --  
Barium titanate - - -
  1. a. Computed from standards specified in parts per million
  2. b. Short-term exposure limit (15 minutes)
  3. c. Ceiling limit
  4. d. 10-minute single period exposure limit
  5. e. Respirable fraction