Poor air quality (AQ) caused 9 million premature deaths in 2015 globally. Furthermore, health problems related to poor air quality produce annual economic costs of €1.2 trillion, and a further €202 billion in lost income. Thus, improving air quality is a major global concern, from both an economic perspective and an environmental one. However, air quality in cities is typically monitored by a limited number of reference stations that produce insufficient data. Without detailed information about local variations it is difficult to develop and implement efficient measures to minimize air pollution. In recent years small sensors have gained interest and momentum, as they would allow the creation of networks that produce comprehensive air quality data for a city. Unfortunately, currently available sensors are not reliable enough, due to the variation of their signal with external conditions (i.e. temperature, pressure, humidity) and low sensitivity. At Insplorion we are developing InAir, a small, efficient, robust, stable and multi-gas monitor that would allow measurement of ambient air quality. At the moment we have a single-gas monitor for NO2, which has already been introduced to the market. We are now taking a step forward by developing a monitor that measures several gases simultaneously that will meet the market demand.