Why the next iPhone and Apple Watch should have a hygrometer

Humidty can be extremely important for your well being

For the dummies out there, hygrometer is an instrument (or a sensor) to measure humidity in the atmosphere. It costs a few bucks (or cents) and surely could be embedded inside an iPhone or Apple Watch with no serious technical, financial (BOM) or battery constraints. The benefits would be great:

1. Coupled with a barometer (which the iPhone already has) and a thermometer (hello Samsung Galaxy 4), a hygrometer would give users a much more precise weather forecast. Next time you ask Siri, it would reply to you collecting the data from your smartphone or a crowdsourced sample.
2. It would help you to stay healthier. It is well known that low humidity levels are bad for your skin and body. A hygrometer could help you to maintain healthy humidity levels at home or at work and save you from a doctor visit due to a bleeding nose, insomnia or a sore throat (conditions agravated by low humidity).
3. A hygrometer could even help you to exercise better. Running in a very low or high humidity environment can be damaging to your health and affect your performance. Check out this article: http://www.runnersworld.com/hot-weather-running/tips-for-running-in-humidity
4. It would help to preserve stuff. High humidity levels favor the growth of mildew and dust mite which are bad for your photos, musical instruments, documents, paintings, etc. If you could be able to measure the humidity levels of your storage places, you would do something about it.

Older Android smartphones used to have a hygrometer, barometer and a thermometer, so I don't understand why their manufacturers dropped the sensors or why Apple has not caught up with the competition yet. With the power of a large iOS installed base, this could really make a difference for customers interested in fitness,weather forecast and staying healthy.

My 2 cents.