Good Day! I am planning on creating an ambient / outdoor air quality monitoring system and i am going to monitor sulfur dioxide, nitrogen dioxide, ground-level ozone, and carbon monoxide gases. Can i use the MQ Series Sensors for outdoor application? They are the most common available sensors in my place.
Check them up for their IP classification.
I rather suspect that you will find the "MQ" sensors far too insensitive for measuring low-level pollution. 
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