"Ultrafine particle emissions from desktop 3D printers" by Dr. Brent Stephens is generally the paper people refer to when discussing this.

Different studies show that ABS emits about 10 times more fumes than PLA.
Also people worry about the volatile monomers such as styrene in both ABS and HIPS. Though no studies show definitive answers to its impact on our health, I bet it all does have an effect on our bodies and we can best be the safest we can be. With PLA generally you are good on emissions, check the datasheets though for additives. For glow-in-the-dark check for heavy metal contents (strontium, copper, zinc, molybdenum, chromium, arsenic have been found in filaments).