ABS is toxic, PLA have lager than 20nm particle.
http://built-envi.com/wp-content/uploads/2014/02/stephens_aaar2013_3dprinters1.pdf
Consider to use Electrostatic Precipitator (ESP) collection plate, but not sure the efficiency.
http://fredlybrand.com/2013/10/19/filtration-in-the-popular-media-ultrafine-particles-and-3d-printing/
Removing ultrafine particles in indoor air: performance of portable air cleaners using various technologies
http://sentryair.com/blog/health/3d-printing-are-there-particles-how-about-fumes/
Ultrafine Particle Research
http://www.epa.gov/ncer/nano/research/particle_index.html
http://www.sciencedirect.com/science/article/pii/S1352231013005086
http://pubs.acs.org/doi/full/10.1021/acs.est.5b04983
New Study Details Toxic Particles Spewed by 3D Printers
https://box3d.eu/3d-printing-safety-pollution-health/
https://cen.acs.org/materials/3-d-printing/3-D-printer-emissions-raise/96/i13