LOGIN TO YOUR ACCOUNT

Username
Password
Remember Me
Or use your Academic/Social account:

CREATE AN ACCOUNT

Or use your Academic/Social account:

Congratulations!

You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.

Important!

Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message

CREATE AN ACCOUNT

Name:
Username:
Password:
Verify Password:
E-mail:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Muncaster, Gary M.
Languages: English
Types: Doctoral thesis
Subjects:
Individual carbon monoxide and hydrocarbon emissions were monitored from passing vehicles using the Fuel Efficiency Automobile Test at four survey sites (Bounds Green Road, \ud Haringey (site A); Dixons Bank, Middlesborough (site B); Abbey Street, Southwark (site C); Uppingham Road, Leicester (site D)}. The remotely measured emissions data is described \ud in terms of fleet emissions, model year emissions and model year contribution to fleet emissions. It was found that there were a large majority of low emitting vehicles contributing little to fleet emissions and a small minority of high emitting vehicles contributing significant proportions to fleet emissions. Model year analysis suggested a low association between \ud vehicle age and mean emissions prior to 1983 but a much improved relationship after 1983. Analysis of model year contributions to fleet emissions shows new gross polluters to be the largest contributors and older vehicles playing only a minor role.\ud The concentrations of carbon monoxide and nitrogen oxides in air were monitored, in conjunction with the FEAT measurement, at various distances from the road (roadside (on the kerb), kerbside (3 metres from the road), 7.5 metres and 15 metres from the road). A decrease of carbon monoxide and nitric oxide concentrations with distance from the road was noted for all sites with the exception of site D where meteorological parameters exerted a greater influence upon air quality than did distance from the road. The expected increase of NO2 concentration with distance from the road, as NO is oxidised to NO2, did not occur. Moreover, NO2 concentrations decreased with distance from the road. However, the production of NO2 by oxidation of NO can be inferred in two ways. Firstly, a much more gradual decline in concentrations with distance from the road was noted for NO2 compared to CO and NO, possibly due to NO2 production counteracting the reduction in concentration caused by dispersion. Secondly, an analysis of the change of ratios between nitrogen dioxide and nitric oxide with distance from the road reveals a relative increase of NO2 with distance.\ud The air quality data were compared with the remotely measured vehicle emissions data, wind speed and wind direction. A statistical examination of the data was undertaken on a halfhourly and five minute basis (no wind data was available on a five minute basis). The halfhourly analyses for both CO and NOx produced positive correlations between vehicle emissions data and air quality, and predominantly negative correlations between wind speed and air quality. Both positive and negative correlations were observed between wind direction and CO/NOx air quality . Regression analyses were undertaken where the results were statistically significant at a 0.1 level. This reduced the sample size for CO to data collected on eight individual sampling days and to only two days for NOx• All the analysed CO sampling days recorded r2 values of greater than 0.5, such that for each sampling day at least half the variation in CO air quality is explained by the variation in on-road vehicle emissions, wind speed and wind direction. The two analysed NOx sampling days recorded r values of approximately 0.8. The five minute analyses produced were less statistically significant giving only a low degree of correlation between CO and NOx air quality and on-road vehicle emissions. Regression analyses were undertaken for only two days for CO and only one day for NOx.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • 2.1B Remote sensing sampling locations (Zhang et ale 1995) . . . . . . . . . . . . . ..
    • 2.2 Remote sensing CO emission data summaif (Zhang et al. 1995) . . . . . . . . ..
    • 2.3 Remote sensing HC emission data summai f (Zhang et ale 1995) . . . . . . . . ..
    • 4.29 Relationship between mean annual hydrocarbon emissions, with error bars calculated using a 95 % confidence interval, and model yearfor site B (Dixons Bank, Middlesborough) (r = 0.09). . . . . . . . . . . . . . . . . . . . . . . . .
    • 4.30 Relationship between mean annual hydrocarbon emissions, with error bars calculated using a 95% confidence interval, and model year for site C (Abbey Street, Southwark) (r = 0.09). . . . . . . . . . . . . . . . . . . . . . . . . . . .
    • 4.31 Relationship between mean annual hydrocarbon emissions, with error bars calculated using a 95% confidence interval, and model year for site D (Uppingham Road, Leicester) (r = 0.26). . . . . . . . . . . . . . . . . . . . .
    • 4.32 Relationship between mean annual hydrocarbon emissions, with error bars calculated using a 95% confidence interval, and model years, 1983-1993,for site A (Bounds Green Road, Haringey) (r = 0.82). . . . . . . . . . . . . . ..
    • 4.33 Relationship between mean annual hydrocarbon emissions, with error bars calculated using a 95% confidence interval, and model years, 1983-1993,for site B (Dixons Bank, Middlesborough) (r = 0.30). . . . . . . . . . . . . . . .
    • 4.34 Relationship between mean annual hydrocarbon emissions, with error bars calculated using a 95 % confidence interval, and model years, 1985-1995, for site C (Abbey Street, Southwark) (r = 0.91). . . . . . . . . . . . . . . . . . .
    • 4.35 Relationship- between mean annual hydrocarbon emissions, with error bars calculated using a 95% confidence interval, and model years, 1985-1995,for site D (Uppingham Road, Leicester) (r = 0.96). . . . . . . . . . . . . . . . .
    • 4.36 Hydrocarbon quintile emissions for site A (Bounds Green Road, Haringey). .
    • 4.37 Hydrocarbon quintile emissions for site B (Dixons Bank, Middlesborough). ..
    • 4.38 Hydrocarbon quintile emissions for site C (Abbey Street, Southwark). . . . . .
    • 4.39 Hydrocarbon quintile emissions for site D (Uppingham Road, Leicester). . . .
    • 5.1 Plan view of sampling site A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
    • 5.2 Plan view of sampling site B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
    • 5.3 Plan view of sampling site C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . , 5.4 Plan view of sampling site D . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
    • 5.5 (A-D) Time series plots ofraw datafor CO at kerbside, 7.5 metres and 15 metres from the road at site A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
    • 5.6 (A-D) Time series plots offive minute CO means at kerbside, 7.5 metres and 15 metres from the road at site A . . . . . . . . . . . . . . . . . . . . . . . . . . ..
    • 5. 7 Hourly carbon-monoxide concentrations at site A . . . . . . . . . . . . . . . . . .
    • 5.8 UK automated air quality monitoring sites: December 1995 (DoE 1995). . . ..
    • 5.9 (A-D) Comparison of one hour mean CO levels at Site A (0), at kerbside, 7.5 metres and 15 metres from the road, to thosefound at AUN sites WL (T) BEX (e) CRD (v) and CU2 (0). . . . . . . . . . . . . . . . . . . . . . . . . . . . .
    • 5.10 (A-C) Time series plots of raw datafor CO at kerbside and 7.5 metres from the road at site B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ., 5.11 (A-C) Time series plots offive minute means for CO at kerbside and 7.5 metres from the road at site B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
  • No related research data.
  • No similar publications.

Share - Bookmark

Cite this article