Maybe a way to connect it more clearly to the geographical site of your ethnography.
It says that petrochemical-related toxicity is part of a global business.
I understand this image is part of a bigger project, and it really works for introducing the global scale of the petrochemical activities.
It was unclear to me the meaning of each number on the petrochemical sites, also I was wondering which of those is your fieldsite.
The answer that comes to my mind is ‘scale’, this image and caption introduce nicely the idea that the local ethnography is part of a global problem. One then wonders what is the scale of the environmental damage behind each of those petrochemical plants.