Fumigation is done with a variety of chemicals - too numerous for me to mention. They all have the potential to cause skin, eye and lung problems. It is therefore never a good idea to be in the fumigated area immediately after the fumigation is done for the reasons mentioned above. My suggestion is that you close the windows when fumigation is done outside your house and then open them 5-10 minutes later. You may still smell the chemicals, but I doubt they will cause problems at that time. An alternative is to use a mosquito repellent directly on your skin according to the instructions on the container.