Yes. Where you are working can also have a big impact. There is a big difference between working outside and in a small enclosed space. When painting outside, the constant fresh air is usually enough to stop harmful levels of vapours building up.
The more enclosed a space is, however, the worse the vapour build up is likely to be and the better the controls needed. This is particularly important if you are working with high solvent, toxic and flammable coatings. An enclosure can take many forms. It could be a permanent structure such as a small room in a building, the inside of a tank or within ductwork. However, temporary enclosed spaces can also be created, for example by using sheeting to seal off an area on scaffolding, within a building or around an object
In some situations, you could end up working in a confined space. This is an enclosed area where there could be an immediate risk to your health and safety. This could be because substances, such as solvents, within the coatings could create a fire / explosion risk or cause you to lose consciousness / suffocate. However, you need to be aware that even if the coating(s) you are using are safe, the space where you are working may not be. For example, there could be a dangerous lack of oxygen or build up of fumes.
[b]Confined spaces are highly dangerous and people have died in them. Special measures to protect you are needed and must be used![/b] – for information see [Confined spaces](http://www.hse.gov.uk/confinedspace/).