In fact, I was involved in the car wash industry for many years and I became sickened by the many car wash owners who hired illegal aliens and equally disgusted by the car wash industry associations that often backed up this practice.
Now then, as an unbiased observer, I have witnessed the over fertilization and over use of lawn chemicals by many landscaping groups - everything from dumping excess Round-Up on weeds to putting 5-10 times the needed chemicals on golf course fairways. Likewise, this happens in gated communities where the HOAs or Home Owners Associations, bid for one landscape company to do all the common grounds.
Most cancers are caused by environmental sources and too many toxins surrounding homes and businesses or schools and playgrounds will do just that. Meanwhile many of the workers doing the landscaping can barely pronounce the chemicals they are using much less know what they are or why they work. Can you see the problem here? Something needs to be done, because healthcare costs are completely outrageous and America simply cannot afford to take these risks.
What can be done? Well there have actually been some studies on this topic, but not enough action has taken place. The amount of chemical that is applied is critical and often very little is needed and yet it is put on in bulk and without knowing it the illegal alien landscapers are killing Americans.
http://www.pesticide.org/RHSLEnvironImpofPs.pdf