According to a new report by Polaris Market Research, the global outdoor air quality monitoring system market was valued at USD 3.77 billion in 2024 and is projected to reach USD 7.66 billion by 2034, expanding at a CAGR of 7.4% over the 2025–2034 forecast period. Growth is underpinned by rapid expansion of smart city projects and digital infrastructure, tightening government...