You’re right. My mother-in-law lives next to a farm. When we go visit my car is filthy within a day from the dust that blows in from the fields.
Somehow I don’t think the food is “free”. These farms tend to charge the same prices as a supermarket. I’ve never found any bargins.
The peaches in northeast Washington state are sold in local farmers markets in NE WA and North Idaho. In late August, they are at perfection ripeness! You cannot get a peach perfectly tree ripened in any supermarket.