Los Angeles Basin's air quality transformation: a long-term investigation on the impacts of PM regulations on the trends of ultrafine particles and co-pollutants.

ABSTRACT: This study investigates the long-term trends of ambient ultrafine particles (UFPs) and associated airborne pollutants in the Los Angeles Basin from 2007 to 2022, focusing on the indirect effects of regulations on UFP levels. The particle number concentration (PNC) of UFPs was compiled from previous studies in the area, and associated co-pollutant data, including nitrogen oxides (NO_x), carbon monoxide (CO), elemental carbon (EC), organic carbon (OC), and ozone (O₃), were obtained from the chemical speciation network (CSN) database. Over the study period, a general decrease was noted in the PNC of UFPs, NO_x, EC, and OC, except for CO, the concentration trends of which did not exhibit a consistent pattern. UFPs, NO_x, EC, and OC were positively corre

SUBMITTER: Badami MM 

PROVIDER: S-EPMC10783618 | biostudies-literature | 2024 Feb

REPOSITORIES: biostudies-literature