@misc{indiciae61604e4606f0,
  title = {Atmospheric aerosol: does a background level exist?},
  author = {W M Porch and R J Charlson and L F Radke},
  year = {1970},
  doi = {10.1126/science.170.3955.315},
  url = {https://pubmed.ncbi.nlm.nih.gov/5460032/},
  note = {Source identifier: 5460032}
}