Assertion: singlet oxygen | /r/AtLocation | the troposphere
Facets:
value: as a source of active oxygen
type: PURPOSE
value: by light of short wavelength
type: OTHER
value: by the photolysis of ozone
type: MANNER
Source sentences:
text: It is also produced in the troposphere by the photolysis of ozone by light of short wavelength, and by the immune system as a source of active oxygen.