Hey, it seems to have a slight infestation of thrips or maybe mites, I'm not totally sure, I can't see well and I don't have much experience with pests. Still, I would recommend that you research more about these specific pests and determine which one it could be based on the characteristics of your plants. I'm almost sure it's one of those two, don't panic, it seems to be a minor infestation but you should combat it as soon as possible. Look for a product to eliminate them and follow the usage instructions. If I'm not mistaken, you could use neem oil, for example.
You should do a bit of research on what the best option is... cheers!