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LONG-TERM CONTINUOUS MEASUREMENTS OF AIR POLLUTANT CONCENTRATIONS, METEOROLOGY AND TRAFFIC ON A RURAL MOTORWAY AND A MODEL VALIDATION
SMHI, Forskningsavdelningen, Luftmiljö.ORCID-id: 0000-0001-6713-5741
1994 (engelsk)Inngår i: Science of the Total Environment, ISSN 0048-9697, E-ISSN 1879-1026, Vol. 147, s. 365-375Artikkel i tidsskrift (Fagfellevurdert) Published
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Abstract [en]

Air concentrations of carbon monoxide (CO), nitrogen oxide (NO) and nitrogen dioxide (NO2) were continuously monitored at a rural motorway site in Sweden for the period February-December 1990. In addition, local meteorology and traffic parameters were measured in order to validate a dispersion model. Even close to the motorway, the concentrations of CO and NO2 were well below Swedish air quality guidelines. For long-term averages the regional background contributed significantly to the downwind levels. The atmospheric reaction between primary emitted NO and background ozone (O3) tends to be a major source of downwind NO2, also fairly close to the road (10 m from the road shoulder), where the average NO2/NO(x) ratio was approximately 0.4. The validated model employs a percentile analysis on the basis of the HIWAY-2 and CALINE4 models and a separate emission model. The agreement between measured and modelled data, as refered to the 98th percentile, was good for NO2 but moderate for CO. This is probably partly caused by uncertainties in emission factors for CO for heavy vehicles. Since a good agreement was observed between measured and calculated NO(x) concentrations, problems in adequately modelling NO2 are probably associated with uncertainties as to NO2/NO(x) ratios in the exhaust, or the modelling of the O3 reaction.

sted, utgiver, år, opplag, sider
VBB VIAK,S-21618 MALMO,SWEDEN. SWEDISH METEOROL & HYDROL INST,S-60176 NORRKOPING,SWEDEN., 1994. Vol. 147, s. 365-375
Emneord [en]
AIR POLLUTANTS, LONG-TERM MEASUREMENT, RURAL MOTORWAY, DISPERSION MODEL, CARBON MONOXIDE, NITROGEN OXIDE, NITROGEN DIOXIDE
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Miljö
Identifikatorer
URN: urn:nbn:se:smhi:diva-1664ISI: A1994NN06400047OAI: oai:DiVA.org:smhi-1664DiVA, id: diva2:897317
Konferanse
4th International Symposium on Highway Pollution, MAY 18-22, 1992, MADRID, SPAIN
Tilgjengelig fra: 2016-01-25 Laget: 2015-12-22 Sist oppdatert: 2017-11-30bibliografisk kontrollert

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