Which role do ultrafine particles play in dirty air? a) they contribute to less than 13,000 premature deaths a year. b) they can worsen symptoms for people with breathing difficulties. c) they are easily removed from the air when people see them floating. d) they are constantly filtered by the nose, which prevents lung absorption

The UFPs or the ultrafine particles refers to the particulate matter of nanoscale size, that is, less than 0.1 micrometer or 100 nanometers in diameter. The ultrafine particles are mainly obtained from the vehicular discharges and are found in the greatest amount on the freeways.  

It has been shown that the ultrafine pollution particles may result in an essential function in stimulating supplementary pathways or inflammation, which elevates the condition of asthma. The ultrafine particles discharged by vehicles and other sources of combustion are enveloped with a layer of organic chemicals, which can be discharged into the lungs.  

These chemicals produce free oxygen radicals that stimulate the immune system in the lung via a cell-tissue destructing procedure called oxidation. Oxidation aggravates the allergic inflammation in the lungs of the individuals suffering from asthma.  

Hence, the correct answer is option B, that is, they can worsen the symptoms for the people with breathing issues.

According to E202, the correct answer to this question is the second choice. They can worsen symptoms for people with breathing difficulties.

answer; i believe is(b)converging