In your question you shared with us that your father works as carpenter and you want to protect him from the health related issues caused by hardwood dust.
first of all, I would like to share with you the information related to health problems created by hardwood dust: These invisible particles get inhaled and cause tiny wounds and scarring to our lungs, each time this happens, it causes a very small amount of irreversible damage. The immediate effect is unnoticeable, but over long periods of time, this can result in significantly decreased lung capacity.
The most common way that wood dust affects a woodworker that it can irritate our skin, our eyes, and our lungs. This can mean reactions such as itching, sneezing, coughing, runny nose, rashes, and asthma-like breathing problems.
To protect your father from all those health problems, there are some safety measures which you can ask him to do while working:
Wear good quality dust mask to reduce the chances of respiratory problems such as asthma, lungs disease etc.
Use protective clothing and gloves to reduce skin exposure.
Keep tools and blades sharp. As tools dull, they may release more dust into the air.
Be aware that significant exposure can happen when cleaning (e.g., emptying dust bags) or maintaining equipment.
Practice good housekeeping. Keep surfaces and floors clear.
Use cleaning methods that reduce re-introducing the dust into the air. Use wet clean-up methods (e.g., wipe surfaces with a wet rag or mop).
Go for regular medical checkups and follow the safety guidelines prescribed by your doctor. In case you need assistance for where to go for free checkups you can visit government hospital near you like lok Nayak, AIIMS, Safadarjung or you can check this list of NGOs
You can go and visit nearby Mauhalla Clinic, which provide free primary health checkup.
Practice good personal hygiene (e.g., wash or shower to remove dust from skin). Wash hands and face when finished a task, and before eating, drinking or smoking. Clean clothes by washing.
https://wwc.wastematters.earth/2018/10/08/in-processfurniture/