Baseline PM2.5 exposure in Hämeenkyrö

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Baseline PM2.5 exposure in Hämeenkyrö describes existing PM2.5 exposure in Hämeenkyrö. Annual average exposure concentration.


Fine particulate matter is a mixture of solid particles and liquid droplets in the air. PM2.5 is particulate matter that is 2.5 micrometers or smaller in size. PM2.5 exposure route is inhalation and the level of exposure dependents on level of PM2.5 consentartion in the air and the length of time spent indoors and outdoors. Personal exposure of individuals can be calculated using air pollution levels from environment, which are weighted with the time-activity pattern.

Exposure to ambient-generated particles (Eag) is dominated by home ventilation and are estimated from ambient concentrations (Ca) multiplied by the fraction of time spent outdoors (Fo) and the fraction of time spent indoors (Fi) modified by the particle infiltration efficiency (Finf).(WHO, 2006.)

Mean personal daytime exposure in Helsinki were 8-11 ug/m3 (Koistinen 2002). In Europe average fairly uniform rural background concentrations were 11-13ug/m3,15-20 ug/m3 in urban background and 20-30 ug/m3 at traffic sites (WHO, 2006.). Urban US highest PM2.5 concs 20-30 mikrog/m3, concentration in Helsinki over several years 8-11 mikrog/m3, non-urban US concs 1-6 mikrog/m3 (Koistinen 2002). Thus, small Finnish town: maybe 7 mikrog/m3?



Based on expert judgement.


Inputs R↻

Eag = Ca * (Fo + Fi x Finf)






See also