A more nascent smart city technology area is the field of non-regulatory urban air quality monitoring, which comprises increasingly small and low-cost air quality monitoring devices that can serve as valuable complements to traditional regulatory monitoring stations.
In 2023, the number of such non-regulatory air quality monitoring devices installed in outdoor urban environments amounted to 154,000 units globally and will reach 498,000 units in 2028. The largest of the five covered smart city application areas was meanwhile the smart city surveillance market, which reached a global market value of €12.5 billion in 2023.
