R: Binned aerosol number to mass concentration conversion

n2m.bin {heR.IndoorAir}

R Documentation

Binned aerosol number to mass concentration conversion

Description

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

Usage

n2m.bin(number=10, limits=c(0.1,0.2), density=1, factor=1, method=1)

Arguments

`number`	a vector of binned number concentrations in counts per cubic cm
`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 mass concentration for each specified bin in units of micrograms per cubic meter

Author(s)

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