SOT 2019: Q&A with Dr. Marisa Kreider

Posted on Behalf of  Marisa Kreider

Please read below for more information from Dr. Marisa Kreider on her SOT presentation.

1.       What was the title of your presentation?  

“Evaluation of Tire and Road Wear Particles (TRWP) in Air in Delhi, India”

2.       What was the scope of your research?

The purpose of this study was to understand TRWP concentrations and contributions to ambient particulate matter in a developing country with well-established challenges associated with ambient air particulate.  Air samples were collected at sites around the city and evaluated for the presence of TRWP using a unique marker for tire tread to understand this contribution.

3.       What did you find?

Like in other cities, TRWP are ubiquitously detectable in air samples throughout Delhi, but represented a minor contributor to overall ambient air particulate, representing only 0.40%, 0.58%, and 0.50% of PM2.5, PM10, and total suspected particulate, respectively.  Absolute concentration of TRWP in Delhi, however, was higher than in cities in developed countries.  Though the causes for this are unknown, potential contributors could include higher traffic volume or differences in road surfaces or tires.

4.       What are the next steps / what other research is needed?

This research is useful for understanding the potential for adverse health effects associated with TRWP in ambient air in developing countries, when combined with research on the toxicity of TRWP.

For more information, please contact Dr. Marisa Kreider at