Does anyone know of an inexpensive sensor that measures other things than particulate matter? Once I got a PurpleAir, I started to want to measure ozone and ot

Does anyone know of an inexpensive sensor that measures other things than particulate matter? Once I got a PurpleAir, I started to want to measure ozone and other pollutants, but I haven’t found a sensor (or even sensor component) that measures that.