rsp_us_ functions are quick access wrappers to commonly
requested SPECIATE subsets.
rsp_us_gas()
rsp_us_other()
rsp_us_pm()
rsp_us_pm.ae6()
rsp_us_pm.ae8()
rsp_us_pm.cr1()
rsp_us_pm.simplified()rsp_us_ functions typically return a respeciate
data.frame of the requested profiles.
For example:
rsp_us_gas() returns all gaseous profiles in SPECIATE
(PROFILE_TYPE == 'GAS').
rsp_us_pm returns all particulate matter (PM) profiles in SPECIATE
not classified as a special PM type (PROFILE_TYPE == 'PM').
The special PM types are subsets profiles intended for special
applications, and these include rsp_us_pm.ae6 (type PM-AE6),
rsp_us_pm.ae8 (type PM-AE8), rsp_us_pm.cr1 (type
PM-CR1), and rsp_us_pm.simplified (type PM-Simplified).
rsp_us_other returns all profiles classified as other in SPECIATE
(PROFILE_TYPE == 'OTHER').