This guide explains how to make your own soldering fume extraction unit, using a PC fan and some charcoal filter.
You will need access to a laser cutter.
This document is a guide to making a portable device which can be used to monitor the air, in terms of PM2.5.
These tiny particles can come from a variety of sources and could be harmful. This device will indicate when the relative number of particulates in the air is high. It could be used to monitor the air in a workshop.