Exposure to toxins can be by inhalation, skin contact, eyes and ingestion. The diagram(by agro-industry) at the top of the page gives the very misleading impression that spray falls neatly onto the crop, and nothing else. Nothing could be further from the truth. The spray is blasted high into the air, above tree canopies, and the vapour can be inhaled by people many hundreds of yards outside the perimeter of the orchard. This is actually the best scenario- if there is a wind the distance can be miles. Sprayed fields/orchards are a hazard to people using adjacent lanes or main roads, either on foot, cycling or in cars.
It is not safe to enter the orchard for four days after spraying, this is a defra regulation. -but unbelievably public footpaths, under council jurisdiction, often run through orchards. The government has refused to respond to the recommendation of the latest 'Royal Commission for the Environment' report, for on-site notices to warn walkers of spraying. Although it is obvious to any rational person that spraying poses a threat to the health of people who live close to sprayed crops, the government refuses to acknowledge this fact.