The book "Existence of Carbonaceous Nano-Particles in the Indoor Air Environment" by Bireswar Paul addresses the issue of indoor air pollution caused by the combustion of cooking fuels in developing countries. It demonstrates that the type of fuel used is heavily dependent on the socioeconomic conditions of the population. The burning of these fuels leads to the emission of volatile and semi-volatile compounds as well as various oxides that are present in indoor air. The emitted particles are particularly hazardous, especially polycyclic aromatic hydrocarbons (PAHs) and ultrafine particles that are smaller than 100 nm. These ultrafine particles, some of which are even below 10 nm, are especially carcinogenic due to their chemical structure. The book provides a comprehensive analysis of the health risks associated with these emissions and highlights the challenges of transitioning to cleaner cooking methods.