The image and captions convey the literal toxicity of PM2.5 and its effects on the body. The use of an image with a colonial era monument in the backdrop further complicates the image's representation of toxicity.
I think that the image itself is powerful and does invoke an understanding of air polution and its effects.
This is a found image that was retreived from a right-wing media outlet. What is notable is that it helps to convey the layers of toxicities the author is drawing out beyond the literal relation to the body.
I think the toxicities of colonial/postcolonialism can be drawn out more in how they relate to the message you are trying to convey through the use of this image. Perhaps also elaborate more on what PM2.5 is and its effects.
The image is powerful, but it is the caption which helps to extend its ethnographic insight, relating to toxic histories of colonialism as well as issues of environmental activism and justice. The image helps to convey "the grappling with toxicity that is not molecular," materializing Pm2.5 in its connection with the body.