It is good to see some sensible replies on this topic, it is not a Police matter as someone suggested.
I used to be a Sprayer operator applying pesticides and fertilisers, i have always suffered from asthma ever since i was a child, i have never had a reaction to any chemical or fertiliser im not saying this isnt possible. The one thing that really aggrevates my chest is cigarette smoke. Years ago when animal testing was the norm nicotine,bleach and flouride were more harmful to rats than the most commonly used agricultural pesticides.
Nitrates are a problem to water courses due to leaching from the soil, theyre not toxic unless ingested or used in bomb making [nitrogen oxide] modern machines for applying chemicals and fertilisers are very accurate pieces of equipment and chemicals and fertilisers are F expensive so it makes no sense to waste them.
All the worst chemicals were banned years ago, the only chemicals that get banned nowadays are done so on environmental reasons traces entering the water courses through leaching, the water companies find them expensive to clean from water. Alot of phosphates enter the water through detergents, but its easier to blame the largest user.