Artificial marble, hot weather, smelly. Is there any way to solve it?

This is an artificial stone of poor quality. To put it bluntly, it is a chemical synthesis. Your friend's is still a poor artificial stone. If I'm not mistaken, it's no use using plants or something. After a long time, hot weather will release the taste. You'd better change it. If you can't bear to change it, plant more plants around. Why don't you change it?