Hi Neil

Oh the deep joys of enthusiastic residents!  

There have been a number of studies looking at the differences between indoor/outdoor air pollutants, and there is a long bibliography here - https://www.ncbi.nlm.nih.gov/books/NBK138707/ which may serve as a useful starting point?

I agree with Peter though, sometimes a resident armed with a diffusion tube is a dangerous thing.  I have been accused on many occasions of hiding an air quality problem because the Council doesn’t monitor at (X) location precisely where (X) location is generally on a roundabout where no one lives because people do not grasp the concept of NO2 reducing in concentration with distance from the source.

Perhaps offer to undertake a proper study for him at his property to allay the fears?  Although I have had one case where a similarly enthusiastic resident declined my offer, presumably on the basis they might be proven wrong and take away what appeared to be their main occupation...

Good luck!

Phil Mason MSc, MIEnvSc, MCIEH, AMIOA
Environmental Consultant (Air Quality, Noise, Contaminated Land) – Infrastructure
Urban Vision Partnership Ltd

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