The growing spate of greenhouse gas and pollutant emissions from gasoline and diesel vehicles (termed vehicular motor emissions, VME) has raised concerns about their impacts on human health and the environment. VME research has also provided insights into the transportation sector's impact on global warming and climate change. According to the Scopus database, VME research has produced over 60,000 documents. Given the significant data, conducting a systematic review of the published documents is imperative to present current and future researchers with critical information and a comprehensive understanding of research developments and scientific growth in the field. Therefore, this paper systematically reviews the publication trends, significant stakeholders, emerging developments, and research landscape on VME from 2007 to 2021 using VOSviewer. The results showed that the number of published documents on VME research increased from 159 in 2007 to 551 in 2021, indicating an enormous 246.54% increase over the last 15 years. The field's most preferred document type and journal sources are "articles" (62.2%) and SAE Technical Papers. The field's most prominent researcher is Ye Wu, with 53 documents, whereas Tsinghua University is the most prolific affiliation. The analysis of the emerging developments and research landscape on VME examined by systematic literature review showed that VMEs comprise nano/ultrafine particulate matter (PM), oxides of carbon (COx), nitrogen (NOx), sulphur (SOx), secondary organic aerosols (SOA), and polyaromatic hydrocarbons (PAH), among others. Hence, studies have recommended designing, developing, and deploying control systems (comprising oxidation catalysts, particulate filters, and selective catalytic reduction), innovative technologies, and sustainable strategies to mitigate VMEs worldwide.