French farmers do have less cancers and less blood cancers than the non farmer population...

http://cancerspreventions.fr/wp-content/uploads/2014/12/AGRICAN.pdf

It is highly improbable, due to the large use of glyphosate, that this molecule increases the rate of NHL and/or other cancers.

But there are pieces of evidence linking waste incinerators and their byproducts in the increased rate of NHL.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2587460/

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6720705/

Pesticides? rather improbable even in other countries
https://www.mdpi.com/1660-4601/11/4/4449/htm