R: Binned aerosol mass to number concentration conversion

m2n.bin {heR.IndoorAir}

R Documentation

Binned aerosol mass to number concentration conversion

Description

Function to convert binned aerosol mass concentrations to binned aerosol number concentrations.

Usage

m2n.bin(mass=10, limits=c(0.1,0.2), density=1, factor=1, method=1)

Arguments

`mass`	a vector of binned mass concentrations in micrograms per cubic meter
`limits`	the particle diameter limits for each bin
`density`	the particle density in grams per cubic cm
`factor`	a factor to multiply by each number concentration
`method`	an integer equal to 1, 2, or 3 specifying the method of calculation, see below

Details

Note: Aerosol = airborne particulate matter.

The methods of calculation are as follows:

1. The particle mass distribution inside each bin is assumed to be uniform with respect to the logarithm of the particle diameter
2. The particle mass distribution inside each bin is assumed to be uniform with respect to the particle diameter
3. The midpoint of each bin is assumed to represent all the particles in each bin

This function assumes that particles are spherically shaped.

Particle number concentration is in counts per cubic centimeter.
Particle density is in grams per cubic centimeter.

Value

A vector of aerosol number concentration for each specified bin in units of counts per cubic centimeter

Author(s)

Neil E. Klepeis
nklepeis@uclink.berkeley.edu
http://socrates.berkeley.edu/~nklepeis