Table 1 Data records for each study year.
Year | Cities | Months | Indirect emission items | Direct emission items | Indirect emission data records | Direct emission data records | Total data records |
|---|---|---|---|---|---|---|---|
2011 | 51 | 12 | 495 | 4 | 302,940 | 2,448 | 305,388 |
2012 | 51 | 12 | 495 | 4 | 302,940 | 2,448 | 305,388 |
2013 | 52 | 12 | 495 | 4 | 302,940 | 2,496 | 311,376 |
2014 | 52 | 12 | 495 | 4 | 308,880 | 2,496 | 311,376 |
2015 | 52 | 12 | 512 | 4 | 319,488 | 2,496 | 321,984 |
