Be waterproof. Caution: Cables and power supply should also be waterproof. Some sensors might be water resistant, but can get damaged by heavy rain. If your sensor needs to be plugged in, make sure you have a power outlet nearby. If you're installing your sensor outside, it should not be placed close to a source of air contaminants, such as a BBQ, or obstructions (walls or windows) that could affect air flow around your sensor, otherwise your air quality data might not be typical of the air quality in your area.
Be designed to be wearable. Caution: what is the battery life? Does it have a GPS to link your location to the air quality data? Does it need to be linked to a phone/app to record data, and if so, does it need to be near a phone or connected to wi-fi to record data? Is the sensor waterproof?
Automatically upload air quality data to the cloud, so you can access it online, or store data internally for manual downloading. Caution: A sensor that automatically uploads data online might be the most convenient, but it will need a wi-fi connection. A sensor that stores data internally for downloading later ensures that no one else sees or owns your data, but the data can't be viewed remotely or in real-time.
Have an app compatible with your brand of phone. Caution: Some sensors need to stay close to a phone to record data, and not all sensor manufacturers make apps for all brands of phones.
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