We investigated changes in traffic-related air pollutant concentrations in an urban area
during the COVID-19 pandemic. The study was conducted in a mixed commercial …

Ammoniated aerosols are important for urban air quality, but emissions of the key precursor
NH3 are not well quantified. Mobile laboratory observations are used to characterize fleet …

Particulate black carbon (BC) affects global warming by absorbing the solar radiation, by
affecting cloud formation, and by decreasing ground albedo when deposited to snow or ice …

Vehicle emissions of nitrogen oxides (NO x), carbon monoxide (CO), fine particulate matter
(PM2. 5), organic aerosol (OA), and black carbon (BC) were measured at the Caldecott …

We present field measurement data and modeling of multiple traffic-related air pollutants
during two seasons at a site adjoining Interstate 40, near Durham, North Carolina. We …

Simultaneous day-time measurement (8 am–5 pm) of on-road air quality and emissions
(remote sensing) on an urban road with traffic volumes varying between approximately 400 …

Real-world heavy-duty diesel trucks (HDTs) were found to emit far more excess nitrogen
oxides (NO X) and black carbon (BC) pollutants than regulation limits. It is essential to …

Land use regression (LUR) models have been used to assess air pollutant exposure, but
limited evidence exists on whether location-specific LUR models are applicable to other …

On-road mobile sources of emissions make important contributions to particulate matter
pollution (PM2. 5–PM10) in cities. The quantification of such pollution is, however, highly …

The lockdown measures caused by the COVID-19 pandemic substantially affected air
quality in many cities through reduced emissions from a variety of sources, including traffic …