This is the Guardian.

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I turned up in Osiek, I guess maybe 10 o'clock on a weekday evening, having just sat on a train from Zagreb that was baking, like really horrendous

horrendous heat.

That's Agit Naranjan.

He's the Guardian's new Europe environment

correspondent, and he's been investigating

a troubling anomaly in Croatia and getting hot in the process.

The air condition I hadn't worked properly and so I was in a carriage of people just sweating buckets.

On the surface, Osieck isn't any different to other Mediterranean cities.

It's a nice pretty eastern Croatian city. It's in the Slovenia region.

Very near the border with Serbia, it's very agricultural, lots of buildings

built in the Austro-Hungarian Empire times.

So it's a very charming little place to go visit. I mean for a city break I could

absolutely recommend it. But there is one thing that distinguishes Osiek.

One of the studies I came across trying to work out how much heat had really

silently been killing people over the last two decades. And the scientists had

kind of managed to also find a particular location that was the worst affected but it didn't know it.

And what I kind of found was that everyone I was speaking to kept giving me more factors that would indicate

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