Fields of Beautiful Mexico.
the smoke is from someone at a distance burning tires to cause rain.
rural crops, farming and growning area, along highway 15, Sonora, Mexico
From these fields come much of what the US eats ... thousands of miles of fields, corn, wheat, potatos, and other fruits and vegetables.
A Mexican French chef I met said it is very important to wash all fruits and vegetables before eatting especially for vegetarians due to the paracites that one can not see on unwashed foods.