Neither are very toxic but ...
Published by Joseph Cotruvo, President at Joseph Cotruvo & Associates, Water , Environment and Public Health
Neither are very toxic but they are flammable and VOCs, so inhalation should be avoided. How frequent would you need to sample? If you have access to a lab, a simple GC analysis using retention time would be quick and sufficient to quantify. No need for GC/MS, There are also wet kits on the market for acetone and toluene sampling. Your NPDES permit would specify.