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Table 3 Ambient air quality standards for substances that may be utilized in solar radiation management

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

Substance U.S Environmental Protection Agency European Environmental Agency World Health Organization
  Limit (μg/m3) Averaging period Limit (μg/m3) Averaging period Limit (μg/m3) Averaging period
Sulfuric acid - - - - - -
Sulfur dioxide 196.5 1 h 350 1 h 20 24 h
    125 24 h 500 10 min
Hydrogen sulfide - - - - - -
Carbonyl sulfide - - - - - -
Nanoparticles - - - - - -
PM2.5 12 1 year 25 1 year 10 1 year
  35 24 h -- -- 25 24 h