NPACTNational Public Affairs Center for Television
NPACTNational Professional Association Coalition on Tuition
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(2013) for the full data description and exploratory analyses.] To align with NPACT's 2-week average integrated samples, we computed averages of daily CSN/IMPROVE data for the corresponding 2-week periods centered on every other Wednesday.
We focused on spatial coverage, filter analysis protocol, and sampling protocol as factors that may influence data comparability among the CSN, IMPROVE, and NPACT networks.
Monitoring sites in the CSN and IMPROVE networks are located far from each other and typically comprise only one or a few sites in a city, whereas the NPACT monitoring sites were densely located within each MESA city region.
The NPACT, CSN, and IMPROVE networks operated on different sampling schedules and used different sampling hardware.
We compared pairs of daily average EC measurements during the overlapping time period using two methods at the six core CSN sites co-located with NPACT fixed sites.
Given that NPACT collected 2-week average measurements and CSN and IMPROVE collected 24-hr samples every third or sixth day, it was not clear whether CSN and IMPROVE data could reliably estimate 2-week averages and temporal trends.
The NPACT exposure prediction model aimed to predict 2-week average concentrations of [PM.sub.2.5] components at participant addresses by adopting the spatiotemporal modeling framework developed for the MESA Air study.
First, we considered the full spatiotemporal model directly using all available [PM.sub.2.5] component data from the regulatory and NPACT monitoring networks as in Keller et al.
Table 1 summarizes important characteristics of the [PM.sub.2.5] component monitoring data across the NPACT, CSN, and IMPROVE networks.
Data compatibility between CSN, IMPROVE, and NPACT networks.
Smoothed temporal patterns for 2-week averages of silicon based on CSN data collected at four sites co-located with NPACT fixed sites generally did not vary greatly when based on data collected every sixth day versus every third day at the same site, although a few local differences were evident (Figure 3).
Approach 1: Full spatiotemporal models combining the CSN/IMPROVE and NPACT data.