Sweat, sugar and pollution: What our wearables could be tracking soon

Most smartwatches and fitness trackers are crammed full of sensors. Take the Apple Watch Series 4 as an example, which has a barometric altimeter to measure altitude, an electrical heart sensor to take ECG readings, an accelerometer to keep tabs on movement, an optical heart sensor to measure your heart rate, a gyroscope to track movement and rotation, and an ambient light sensor to control the brightness of your screen.
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https://www.wareable.com/wearable-tech/5-wearable-sensor-technologies-incoming-7026