Wherever freshly squeezed lemon juice and grated zest are involved, lightness comes into play. Whether in refreshing skin/haircare products, household cleaners, whether the aromas of fish, meat, vegetables and pasta are subtly enhanced, or whether indigestive cakes and desserts are to be counterbalanced. There are almost unlimited possibilities to use the scent and taste.
When it comes to the scent of lemons in particular, very few people react with resistance or even disgust – as you can easily experience with other scents.
Citrus oils differ from other essential oils not only in their acceptance.
They are obtained by cold pressing: the fragrances are retained in their entirety. Otherwise, essential oils are mainly obtained with the help of hot steam – unfortunately, this means that particularly fine odor components are easily lost (as is also known from cooking at home).
The shelf life of citrus essences is lower than that of most other essential oils. They are particularly sensitive to heat and light. With careful storage, however, the shelf life can be extended.

Lemon oil effects, how the essential oil is composed, what these components induce, which citrus fruits are available, interesting research results- you can find all these informations here:

Lemon: Plant, Extraction, Varieties, Citrus
Interesting facts about lemons (use, storage, nutritional value)
Some chemistry: what’s in it and what’s it good for?
lemon in research results