Air quality

This is very area ranging from level of O2 CO2 to level of poisson gasses like CO and other gasses.
The prices for a sensor range from maybe 30 dkk to several 1000 KK

MQ sensors

In the bottom is link to a unified library which handles all the mq sensors shown her

Disclaimer : I have not tested it - but it looks nice.


Arduinotech has a long list of mq sensors here

Robocraze.com has more information here

Purpose/Type of gasses

Many of the sensors has a sensitivity graph. Please note that y-axis i logaritmic

Other

A nice project about air quality SPG40 sensor

Other from Sparkfun:

A unified sensor library - for MQ2, MQ3, MQ4, MQ5, MQ6, MQ7, MQ8, MQ9, MQ131, MQ135, MQ303A, MQ309A.



SOME THING TO NOTE

  • energy consumption

  • time to warm up when switched on until first measurement is valid

  • Qality of data

    • accuracy

    • range: PPM: parts pr million



Always under construction