There is even Si-Ware FTIR MEMS sensor. It is quite pricey (more then 1K USD) and resolution is not that great, but pricey will drop eventually and it might be

There is even Si-Ware FTIR MEMS sensor. It is quite pricey (more then 1K USD) and resolution is not that great, but pricey will drop eventually and it might be good enough for some applications.