It’s not uncommon to get minor headaches or deal with sniffles when spraying agricultural chemicals. If the cab of your tractor or self-propelled sprayer is well-sealed, and the problem isn’t simply due to air leaks, then activated charcoal cab air filters might be a solution.
A seed corn company in my area that sprays herbicides or pesticides all summer long had problems with its sprayer operators complaining of headaches and sinus problems. They switched the cab air filters in all their self-propelled sprayers from standard paper elements to activated charcoal elements, and those complaints went away. Their rule of thumb for their sprayer operators is now: “If you start to smell chemicals in the cab, change the [activated carbon] air filter.” (Overtime activated charcoal filters become “saturated” and lose their ability to absorb annoying fumes.)
Several mainline self-propelled sprayer manufacturers offer optional activated charcoal air filters through their parts system. Otherwise, do an internet search for “activated charcoal air filters for tractors/sprayers” and several options will appear.
