Something to consider.... there have been a couple of decades of increasingly stringent emissions standards, resulting in the levels of airborne pollution reducing over time, so if their hypothesis that airborne pollution is responsible for an increase in heart attacks, then you should be able to see a drop in the rate of heart attacks as the levels of NO and PM10 pollution decrease.

This is for UK, but should be similar for other Western European locations: https://pic8.co/sh/dXDxvK.png

Given that data, there should be a noticeable down trend in heart attacks since the mid '90s when air pollution levels peaked.

TL:DR; The hypothesis that pollution is causing the current sudden increase in heart attacks is not supported by reality.

Scientists and doctors seem baffled a lot these days - I wonder what could be causing this?

That's brilliant! They get to explain away unexpected heart attacks - and push to get rid of gasoline vehicles, at the same time! It's a twofer!

i'm not vaxxed and just with the way everyone is driving these days, i am much more likely to have a heart attack while driving just from pure rage sparked by the stupid shit i am forced to witness.

every day i get onto an active freeway where the onramp merges directly onto the freeway (65 mph) and every day i am behind someone who thinks it's okay to merge at 30 mph. the onramp of a freeway is a runway to get up to speed, you stupid fucking cunts.