Up till not too many years ago a high percentage of fertilizer had substantial amounts of lead in them. To check the exhaust a CO2 inexpensive monitor will do the job nicely. If the lead is a result if the fertilizer just remember that you will not absorb it through the skin. You can ingest it. WASH YOUR HANDS BEFORE EATING OR SMOKING and you will be fine. This is an OSHA requirement for occupations with lead exposure such as battery making.

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