Significance Nonvolcanic stratospheric aerosols account for 20% of the radiative forcing of the entire atmospheric aerosol system since 1850. The Asian summer monsoon (ASM) effectively pumps Asian pollutants to the upper troposphere and lower stratosphere, leading to enhanced aerosol formation. Our in situ measurements combined with modeling work show that the aerosol formed within the ASM anticyclone is exported to the entire Northern Hemispheric stratosphere. On an annual average basis, we estimate that ∼15% of the Northern Hemisphere column stratospheric aerosol surface area originates from the Asian summer monsoon anticyclone region. This surface area is comparable to the modeled contribution from the sum of the small volcanic eruptions over the period 2000 to 2015.