Dear Navya, 

I guess that you need this type of measure in order to study the effect (or impact) of childrens exposure to fine particles (or fine type of atmospheric pollutants). So, I would like to suggest you to consult and read articles of Pr. Rozalina Chuturkova wich I will you add her profile adress in Researchgate.

Good luck in your study

https://www.researchgate.net/profile/Rozalina_Chuturkova 

Also you can discuss with authors in this project, may be they can help you !

https://www.researchgate.net/project/Ultrafine-Particles-from-Traffic-Emissions-and-Childrens-Health-UPTECH

http://aqicn.org/sensor/shinyei/

forget the 2 previous answers

tests in  peer-reviewed publication

http://www.tandfonline.com/doi/full/10.1080/02786826.2015.1100710

Thank you Harry, based on the article, it would be best to go with Sharp GP2Y1010AU0F, based on its high correlation with SidePak readings. Let me know if you have other recommendations.

Naya

You might try a colleague of mine who developed an own cheap sensor at our institute

but I do not know if he has the time to answer

rene Otjes