I haven't read them all, but the article links to a few of them (some are paywalled, unfortunately. Anna's archive might have them, I haven't checked):

1 - Impact of noise and air pollution on the cardiovascular system through the brain–heart axis
2 - The combined effect of air and transportation noise pollution on atherosclerotic inflammation and risk of cardiovascular disease events
3 - A review of the auditory-gut-brain axis
4 - Recent Advancements in Understanding the Gut Microbiome and the Inner Ear Axis
5 - Gut Resistome and Hearing Loss in Young Adults: A Preliminary Study on the Interplay Between Microbial Resistance and Auditory Health
6 - Oxidative stress and inflammation contribute to traffic noise-induced vascular and cerebral dysfunction via uncoupling of nitric oxide synthases
7 - Homo sapiens, industrialisation and the environmental mismatch hypothesis

You can also have a look at this meta analysis of another 22 articles that met their criteria and further dive into each of them:

The relationship between noise pollution and cardiovascular diseases: an umbrella review on meta-analyses

Tagging @Broken_Orange_Juice@lemmy.world as they also showed interest

Yeah I wanna see the paper to see if they controlled for this