Aerosol pH is difficult to measure directly but can be calculated if the chemical composition is known with sufficient accuracy and precision to calculate the aerosol water content and the H+ concentration through ion balance. [2] In practical terms, simultaneous measurements of at least one semi-volatile constitute, e.g. NH3 or HNO3, are required to provide a constraint on the calculation of pH. Long-term records of aerosol pH are scarce due to the limited monitoring of NH3 in conjunction with PM2.5. In this study, 10-year (2007–2016) records of pH of PM2.5 at six eastern Canadian sites were calculated using the E-AIM II model with the input of gaseous NH3, gaseous HNO3 and major water-soluble inorganic ions in PM2.5 provided by Canada's National Air Pollution Surveillance (NAPS) Program.
Original Source [3]
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/sensitivity-pm25-acidity-meteorological-parameters-and-chemical-composition-changes
[2] http://www.indiaenvironmentportal.org.in/files/file/PM2.5-acidity-Canada-city.pdf
[3] https://www.atmos-chem-phys-discuss.net/acp-2019-238/
[4] http://admin.indiaenvironmentportal.org.in/category/author/ye-tao
[5] http://admin.indiaenvironmentportal.org.in/category/author/jennifer-g-murphy
[6] http://admin.indiaenvironmentportal.org.in/category/journal/atmospheric-chemistry-and-physics
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/canada
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/aerosols