Sunset clouds near the refinery have a weird orange-brown tint now

I take cloud pictures every evening from my back porch. For the past few weeks, the clouds over the refinery look muddy orange, not clean red. It reminds me of smog pictures I saw online. I'm starting to think it's from all the plant smoke mixing with the air. Has anyone else noticed cloud colors shifting near big pollution sources? I want to learn if this is a sign of bad air quality. How can I use my photos to show this change to others?