It's not just poverty, but education about pollution and a common view in the post-communist countries that the common good (clean air in this case) isn't so important. It's the same with things like noise or graffitis for instance.

In Latvia you commonly see rich people with BMW SUVs behaving like this. My friends see no problem with having coal barbecue or very heavy music in the center of Riga. We often have to remind new tenants in our building the benefits of sorting waste - and they are not poor.