The CairClip is an autonomous pollution sensor that monitors low levels (ppb for most) within 1 min. intervals. Cairclip can be purchased to monitor any of the following pollutants: Ozone and Nitrogen Dioxide, Nitrogen Dioxide, Carbon Monoxide, Hydrogen Sulfide and Mercaptans, Ammonia, Sulfur Dioxide, Formaldehyde, Non-methane Volatile Organic Compounds, Carbon Dioxide, or Particulate Matter