Abstract
Atmospheric ozone was monitored in Michigan during the late 1880's using Schoenbein's test paper. A conversion chart was constructed to relate the Schoenbein ozone scale at various relative humidifies to ozone levels indicated by a Dasibi ozone monitor. Average monthly ozone values were highest during the spring months and lowest during the winter season.
Highest recorded ozone levels accompanied southwest wind flow into Michigan. Ozone level increased with time as an air mass passed over Michigan and dropped immediately after frontal passage. These patterns are similar to patterns observed in today's data. These results strongly suggest that anthropogenic nitrogen emitted by actively growing green plants and soils is the major source of photochemical ozone precursors in earth's boundary layer.
