Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Model structure for the best model selected by AQS and fixed site cross-validation for each pollutant and region
| Pollutant | Location | No. of time trends | No. of PLS scores | df/year in time trend | Spatial smoothing | |
|---|---|---|---|---|---|---|
| Long-term average (β0) | Time trend coefficients (βi) | |||||
| NO2 | Los Angeles, CA | 2 | 3 | 4 | Yes | Yes |
| NOx | Los Angeles, CA | 2 | 2 | 8 | Yes | Yes |
| Baltimore, MD | 1 | 2 | 4 | Yes | Yes | |
