example of such sensors is: MQ_2 its able to assess carbon monoxide.

I need one sensor that could do all, and with accurate level of sensing

It is quite hard to measure all with one sensor and with an accurate level!

Or it depends on what you mean by 1 sensors. If it can be a system that embeds several sensors (almost one for each gas for a good accuracy), it could be possible.

But if you want just 1 sensors (like the MQ_2) which gives you a global information, it will be hard, from my point of view to conciliate all the pollutants you have mentioned.

I hope it helps!

Fabien

Thanks Fabien, but still needs links to some sensors to support such answer

I think the answer depends on what you're trying to do and how much you want to spend. The best sensors will be lab grade and quite expensive.

We've been playing with the sensors included in the "Air Quality Egg" and, while I can't vouch for them overall, I can say that they show some promise. The sensors don't cover the range of gases in which you've expressed an interest but there are a few you might want to look at. These are wildly inexpensive and may be worth considering depending on your goals. We want to characterize intrasite variation (something we've done in agriculture) as it could be accomplished by citizens and need to look at inexpensive sensors for that reason.

http://shop.wickeddevice.com/product/air-quality-egg-sensor-shield/

http://shop.wickeddevice.com/product/air-quality-particulate-add-on/

http://shop.wickeddevice.com/product/ozone-o3-sensor-add-on/

http://shop.wickeddevice.com/product/volatile-organics-voc-sensor-add-on/

We've been told by people in the field that the particulate matter sensor is particularly nice at that price point.

We've mostly concerned ourselves with cleaning the data from the CO2 and NO sensors (MICS 5525 and MICS 2710) which arrive uncalibrated. We've been looking at ways to calibrate by (a) running in an uncontrolled environment and modifying the output (blind calibration protocols) and (b) working with folks with labs where output is compared with well calibrated equipment. In both cases, defining a polynomial function to apply to the raw data.

We're hoping that by deploying these closely enough that we can get reasonable interpolation, we can also use the set of data points to help in better understanding the levels in the environment. Outliers in a network like this could point to problems in the environment or with the sensors but we can live with that as the sensors will be deployed in a densely populated area with good access.

Good luck,

Richard

Thanks a lot Beckwith , this is very helpful

You may want to take a look at Photoacoustic Cas Sensing systems. An interesting approach is used when for each gas detection a micro chamber is used filled up with 100% of the gas you need to detect. So it is possible to prepare photoacoustic micro chambers with all the gases you need to detect and it`ll be your custom system...

Thanks Prof. Zaytsev for your kind answer

have you tried MQ-136 Sensor .. its call Air Quality Sensor.. i think this will help you