The California Office of Environmental Health Hazard Assessment (OEHHA) has proposed an Inhalation Unit Risk (IUR) Factor of 7.9 × 10–4 (µg/m3).  Put another way, the risk from acrolein is estimated to be 1,300 excess cancer cases in a million. So, what does that mean?  For agriculture this will be a big deal. First, acrolein can be found in many places, but primarily as a product of combustion. It can also be found in tobacco smoke, wildfire smoke, pesticides and food processing. More importantly, the level of the IUR is the concern. At the proposed level, the risk is 10 times higher than that of benzene and is in the same range as diesel exhaust in total. If adopted as is, more pressure would be put on mobile sources to convert to electric. It should be noted that there are large uncertainties associated with the draft proposal and the Association is part of a large coalition digging into the proposal and pushing back on the lack of information and suspect data used to make the proposed determination. This is one everyone should monitor closely in the coming months.