Gas sensors Air pollution 1 Air pollution index 1 Air quality measurement 1 Chemical detection 1 Chemical sensors 1 Composites material 1 Core-shell composites 1 Gas detectors 1 Gas sensing electrodes 1 Gases 1 II-VI semiconductors 1 Internet of things 1 Linear transformations 1 Metal-organic frameworks 1 Metalorganic frameworks (MOFs) 1 Nano metal oxide 1 Nanorods 1 Organometallics 1 PM2.5 1 Phase interfaces 1 Raspberry Pi 1 Remote monitoring 1 Situ transformation 1 Volatile organic compounds 1 ZIF-8 1 Zinc oxide 1 Zinc oxide particles 1 Zn 2+ 1 ZnO 1