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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