Almost every conversation about sun protection is a conversation about leisure. It assumes a beach, a holiday, a choice about whether to be outside. For people whose work is outdoors, none of those assumptions apply. Exposure is not a decision, it is a condition of employment, and it happens on the days with the highest ultraviolet as readily as on the days with the lowest, because roofs, roads, boats, farms and building sites do not observe the UV index.
This file is about that exposure. It is not medical advice and it is not employment advice. It is a description of the conditions and of the strategies that survive a working day.
The conditions, set out plainly
A working day outdoors, spring to autumn
Conditions block- UV load
- Whatever the day gives, taken from morning to late afternoon including the hours around solar noon, five or six days a week, for months.
- Water exposure
- Variable by trade. Groundworks, roofing and marine work all add wet hands and washing.
- Sweat
- High and sustained under workwear and personal protective equipment.
- Friction
- High. Gloves, harnesses, tool belts, collars, hard hat straps and constant hand washing.
- Typical duration
- Eight to ten hours daily, repeated. This is the defining feature.
- What fails first
- Everything, by mid morning, because a single application cannot cover a working day and reapplication competes with the job.
- Protection strategy
- Clothing and scheduling first: long sleeves, a brimmed or flapped hat under or with a hard hat, and shade or task rotation around the middle of the day. Sunscreen for the face, ears, neck and hands, kept in a pocket rather than a van.
Why cumulative dose is the point
A holidaymaker might take fourteen days of intense exposure a year. Someone laying kerbs, thatching a roof, crewing a boat or working a farm takes a moderate to high dose most working days from April to September, year after year. The total is not comparable, and it accrues on a predictable set of sites: the face, the ears, the back and sides of the neck, the forearms, and the backs of the hands. Cancer Research UK's public information on sun, UV and cancer is the right general reference for why cumulative exposure matters.
There is also an asymmetry that recreational exposure does not produce. Drivers, plant operators and anyone working consistently facing one way accumulate more on one side of the face, one forearm and one side of the neck. It is worth knowing where your own asymmetry is, because that is where to look when you check your skin.
The reapplication clock
Reapplication clock: A working day, 0730 to 1700
The distinguishing feature of occupational exposure is not intensity, it is repetition. This rail is one day of many. Mechanism only.
A strategy that survives a working day
Build it into what you already wear
A long sleeved work shirt, a collar, and a hat that covers the ears and the back of the neck do more for an outdoor worker than any product, because they require no decisions during the day and do not degrade. Many trades already have long sleeve requirements for other reasons. Where a hard hat is worn, brim attachments and neck flaps designed to fit them exist. Textile protection is a rated property with published test standards, discussed in our note on UPF clothing.
Schedule around the middle of the day where the work allows
Not always possible. Where it is, moving the most exposed tasks away from the hours around solar noon is the single most effective control, because it reduces the dose rather than trying to block it.
Keep the sunscreen on your person
In a pocket, not in a van, not in a site office. The distance between a person and their sun protection determines how often it is used far more than any intention does.
Protect the hands deliberately
Hands are washed repeatedly, gloved and ungloved, and abraded all day. They are also the site people apply to last and least. If there is one deliberate addition to a working routine, it is the backs of the hands and the wrists.
Lips and ears
Both are consistently missed and both take a lot of sun on someone working outside. Our note on scalp, ears and lips covers why these sites keep being skipped.
Personal protective equipment cuts both ways
A hard hat shades the top of the head and nothing else. A harness abrades the shoulders. Gloves protect the palms and leave the backs of the wrists exposed. Safety glasses may or may not be ultraviolet rated, and the standard that governs sunglasses is a different one from the standard that governs impact protection. It is worth checking whether the eyewear you are given is rated for ultraviolet at all. Our note on eyes and lips sets out the standard.
What the label will and will not tell you
Once a day
What it certifies
Nothing that a UK or EU regulator has endorsed. In the UK and EU, claims implying that a single application provides protection for a whole day are the kind of claim regulators and advertising codes have long treated as problematic, because they invite people to skip reapplication. The European Commission recommendation underpinning sunscreen labelling advises against claims conveying all day protection.
What it does not
It does not certify that protection survives a working day, and no immersion, abrasion or wear procedure supports it. Anything that rubs, sweats, washes or wipes removes the film regardless of what the front of the pack suggests.
Claims implying whole day protection are exactly the sort of thing the advertising codes exist to police. The CAP and BCAP codes, enforced by the Advertising Standards Authority, require that objective claims be substantiated, and the general framework for cosmetic product claims in retained UK law requires evidence to support them. Our standards note on who regulates sunscreen in the UK maps out who does what.
What is not verifiable
We cannot tell you the dose any particular trade receives, because we have measured nothing and we will not repeat figures we cannot stand behind. We are not going to publish an occupational risk statistic. What we can describe is the mechanism, the pattern of exposure and the controls that reduce it, and point you to the institutions that publish the evidence.
Checking, and when to get something looked at
People who work outdoors have the strongest reason to make skin checking routine, and the least prompting to do it. The NHS publishes guidance on sun safety, and on when to see a GP about a change to the skin. We do not offer diagnostic guidance, we do not describe what any particular mark means, and we would rather you took an unremarkable thing to a GP than sat on a remarkable one. Our note on checking your skin sets out how to build the habit.