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Yes, depending on the version, the air-⁠Q has one or more free slots for additional sensors. For example, it could be expanded with an additional particulate matter sensor for ultrafine particles or a sensor for methane. You can find all currently available add-on sensors at https://shop.air-q.com/?lang=eng

In principle, the air-⁠Q is designed as a stationary measuring system, since it continuously adapts to its surroundings via automatic calibration. However, using a mobile power source (e.g. USB power bank, rechargeable battery, battery), it can also be used on the go, i.e. wirelessly.

Here are two example calculations for the capacity needed for a given period of time. The figures refer to power banks that state capacity in mAh at 5V:

The power source should supply the air-⁠Q for 24 h. How much capacity is needed?
Calculation: 0.26 A * 24 h = 6.24 Ah = 6240 mAh.

The power source has 25000 mAh — how long will it last?
Calculation: 25 Ah / 0.26 A = ~96 h.

The air-⁠Q is designed for indoor use. Outdoors, splash water or rain can get in and damage the electronics. However, if the device is protected from direct water exposure, it can be used briefly for outdoor measurements as well. Condensing moisture must absolutely be avoided, as it can otherwise irreparably damage the air-⁠Q. Within the scope of its specifications (datasheet) , the air-⁠Q can, for example, be used under a roof.

Note: When measuring outdoors, the electrochemical sensors (such as ozone and nitrogen dioxide) may occasionally deliver inconsistent readings in places, since the strong temperature and humidity fluctuations outdoors affect these sensors due to their measuring principle and require recalibration (--> automatic calibration of the air-⁠Q).