The best replacement for ppm is ppb.

The best alternatives to ppm are rated as following:
★★★★★  ppb
★★★★  mg l
★★★★  pcm
★★★  percent
★★  ec
★★  pwm
★★  mg/l
★★  ipm
★  mg kg
★  percentage
★  dpmo
★  tds
★  ppmv
★  mg/kg
★  ppt
★  cpk
★  mg m3
★  ppm
★  gpg
★  mg liter
  mg/m3
  parts per million
  grains per gallon
  mg\/kg
  ug/l
  lel
  conductivity
  ec meter
  vu
  mg litre
  mg\/l
  orp
  tds meter
  wt
  cpan
  epm
  iso ppm
  vpm
  mg\/liter
  pmo
  ntu
  business plan
  subscription agreement
  mg ml

Your alternative for ppm is not listed? Suggest!
Speaking about ppm, one probably shouldn't forget about molarity.

Other search terms related to ppm and their ratings are:
★★★★★ molarity
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ppm
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