Neil
I like the term " enthusiastic local resident" by the way. However you might want to see them as just a ""frightened local resident" who is worried by media reports and frightened of something they do not understand. In my time I have dealt with a number of enquiries from residents who are convinced that their AQO is not listening and is trying to confuse them with science. Often my reply to them has been to explain that their AQO is unlikely to be doing the job for the money and is just overwhelmed with a workload. Once I get both sides talking , the issue seems to go away but getting over the initial suspicion can be an issue.
Regards
Peter Fleming
07958 205920
Skype: petermfleming
-----Original Message-----
From: Air quality <[log in to unmask]> On Behalf Of Neil Scott
Sent: Friday, 21 September 2018 18:16
To: [log in to unmask]
Subject: Outdoor versus indoor NO2 levels
Hi
I've an enthusiastic local resident that has obtained some diffusion tubes and measured NO2 outside and inside his house simultaneously. The resident has measured 56 ug/m3 outdoors and 46 ug/m3 indoors. From what I can tell the house facade is some 5 m from the kerbside, I don't have details of monitoring locations or exposure periods.
Whilst his house is near an existing AQMA (breach of annual NO2 only) there is a junction which reduces the traffic flow past his property by about 30% when compared to that within the AQMA. Our highest measured levels within the AQMA are above the annual target value but less than 50ug/m3. His property is not in a street canyon and is no nearer the kerb than other dwellings that are inside the AQMA. Our monitoring location (lamppost) nearest his dwelling doesn't show a breach of the annual target level at that end of the AQMA nearest his property.
Can anyone point me in the direction of robust studies that have looked at the relationship between outdoor and indoor NO2 in the UK, particularly where dwellings are located by the roadside? And on 'typical' levels of NO2 likely to be encountered inside houses?
Apologies for the somewhat vague nature of my enquiry however my respondent has decided that tweeting his data and concerns about air pollution levels to the Council Leader direct is more appropriate than speaking to me on the phone.... What joy.
I'm aware that there are lots of confounding issues here, not least uncertainties around data collection, exposure periods and the 'misuse' of a single months exposure results to draw conclusions about annual air pollution levels locally. And whether these results are worth the time to right this post. I know from experience that gas cookers and fires can have a significant impact on indoor air pollution (NOx) levels. However I'd appreciate direction toward any useful references about the indoor / outdoor air pollution relationship to help me explain to my resident and Councillors!
Any suggestions about studies, or constructive comments welcomed!
regards
Neil Scott
Senior Specialist - Pollution
Eastleigh Borough Council
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