It definitely looks like you have some spider mites marching around on the plant surfaces. They feed by piercing and sucking out the  cellular contents on your plants including the chlorophyll which is why you see all this white speckling instead of nice green leaves.  They like hot, dry environments like you might see on a balcony in the sun. If in containers and the plants go dry frequently, with more air movement and heat--they are in my droughty conditions-also an attractant. 

In this case overhead watering with some spray force will help dislodge them. 

Insecticidal soap can be used as long as the temps aren't hitting 85 degrees and up and plants shouldn't be sitting in the sun when applying it--they'll scorch. Also make sure they are well watered ahead. You may want to do a test as some plants are sensitive and will curl up-- in which case rinse the soap off off.   You could try 1 TB  plain liquid castile soap per quart of distilled/purified water (avoid using known hard water).