They need some new tech on exhausts of vehicles to capture these hazardous ultra fine exhaust particles. You exhaust filters don’t really do much to capture these fine particles
The data showed a steep decline in larger particles. Black carbon, for example, declined by 81% between 2014 and 2021. This is a clear indication that there has been a positive impact from the introduction of exhaust filters.
In contrast, however, the number of particles described as “ultrafine” — smaller than 100 nanometres — reduced by only 26%. The smallest group of particles, measuring less than 30 nanometres, did not reduce at all, giving a clear indication that filters are not effective against these types of particle. WHO guidelines define concentrations of ultrafine particles above 10,000 per cubic cm as “high”and concentrations measured at the Marylebone Road site were around twice this level.
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They need some new tech on exhausts of vehicles to capture these hazardous ultra fine exhaust particles. You exhaust filters don’t really do much to capture these fine particles
https://cleantechnica.com/2023/04/03/vehicle-exhaust-filters-do-not-remove-ultrafine-pollution-new-study/
The data showed a steep decline in larger particles. Black carbon, for example, declined by 81% between 2014 and 2021. This is a clear indication that there has been a positive impact from the introduction of exhaust filters.
In contrast, however, the number of particles described as “ultrafine” — smaller than 100 nanometres — reduced by only 26%. The smallest group of particles, measuring less than 30 nanometres, did not reduce at all, giving a clear indication that filters are not effective against these types of particle. WHO guidelines define concentrations of ultrafine particles above 10,000 per cubic cm as “high”and concentrations measured at the Marylebone Road site were around twice this level.
Edited by BOHICA