air-quality-sensor: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/air-quality-sensor - from package: air-quality-sensor

You may install the required package with command apt-get install {package}

Error in other languages:
air-quality-sensor: bevel nie gevind nie
air-quality-sensor: comandă negăsită
air-quality-sensor: comando não encontrado
air-quality-sensor: commande introuvable
air-quality-sensor: command not found
air-quality-sensor: käsku ei ole
air-quality-sensor: không tìm thấy lệnh
air-quality-sensor: komanda nerasta
air-quality-sensor: Kommando nicht gefunden.
air-quality-sensor: kommandot finns inte
air-quality-sensor: komut yok
air-quality-sensor: nie znaleziono polecenia
air-quality-sensor: níor aimsíodh an t-ordú
air-quality-sensor: no se encontró la orden
air-quality-sensor: no s'ha trobat l'ordre
air-quality-sensor: opdracht niet gevonden
air-quality-sensor: parancs nem található
air-quality-sensor: perintah tidak ditemukan
air-quality-sensor: príkaz nenájdený
air-quality-sensor: příkaz nenalezen
air-quality-sensor: команда не найдена
air-quality-sensor: командата не е открита
air-quality-sensor: 命令找不到
air-quality-sensor: コマンドが見つかりません