Although the gas sensor market is in constant development, proposing specific solutions for various niches might be challenging, as there are a lot of gases and markers, which require fast, sensitive and reliable solutions. In this paper, a metal-oxide based thin film of zinc oxide doped with silver particles is proposed as a potential solution for hydrogen, formaldehyde and even UV detection at specific ranges. Registered responses are shown as UV/gas to dark/air ratio. For gas detection, obtained results show relatively fast response and recovery for hydrogen, with a response value, up to ~2.5, at operating temperatures of 350–400 ° C. In case of formaldehyde, the response value has been registered at 250–300 ° C, up to ~1.7 and a better selectivity. UV photo-detection properties showed the best sensitivity towards the 280 nm wavelength, with the up to ~160. Formaldehyde is regarded as an inhalation hazard, which could provoke cancer if maintaining a certain concentration in lungs, thus it is important to have measurement tools for concentration in various work environment, especial medical one. On the other hand, hydrogen being studied as both energy carried and biomarker for certain diseases, offers a promising direction for gas sensing manufacturers. While UV sensors are necessary to monitor harmful outdoor radiation, they also play a vital role in controlled environments by supporting crop cultivation and improving semiconductor production.