Please see here for details about the calibration improvements made since Phase 2. The average level recorded for all three sites for Thursday was the highest in Phase 3 so far at 460 ppm. Although pre-dawn peaks were notably higher, so were the minimum values in the afternoon. We have reported various data collection methods in these posts – satellites, aircraft, flux-towers, sensors on vehicles and light-rail, as well as fixed location sensors. Today’s second chart illustrates a truly unusual method. Scientists at La Sapienza University in Rome collected data with 12 carrier pigeons wearing lightweight CO2 sensors, GPS and temperature, relative humidity and pressure sensors in flights over the city. Although just a test of the methods, they reported “The results show that the CO2 concentration varies considerably according to the level of urbanization, underlining the positive impact of green urban areas on air quality”.
Daily Averages – Phase 3
For reference, latest monthly average (August 2023) from CSIRO for Kennaook/Cape Grim in NW Tasmania was 417.1 ppm. (Note – these are provisional values, subject to revision folllowing sensor re-calibrations and other checks.)
Date | Petrie Terrace | Chapel Hill | Bellbird Park |
28-12-2023 | 445 ppm | 466 ppm | 469 ppm |
27-12-2023 | 435 ppm | 448 ppm | 446 ppm |
26-12-2023 | 435 ppm | 439ppm | 434 ppm |
25-12-2023 | 429 ppm | 441 ppm | 441 ppm |
24-12-2023 | 432 ppm | 442 ppm | 437 ppm |
23-12-2023 | 421 ppm | 436 ppm | 443 ppm |
22-12-2023 | 430 ppm | 432 ppm | 446 ppm |
21-12-2023 | 429 ppm | 442 ppm | 433 ppm |
20-12-2023 | 419 ppm | 431 ppm | 431 ppm |
19-12-2023 | 421 ppm | 430ppm | 429 ppm |
18-12-2023 | 424 ppm | — | 426 ppm |
17-12-2023 | 432 ppm | 445 ppm | 433 ppm |
16-12-2023 | 434 ppm | 444 ppm | 439 ppm |
15-12-2023 | 433 ppm | 439 ppm | 436 ppm |
14-12-2023 | 421 ppm | 427 ppm | 426 ppm |
13-12-2023 | 422 ppm | 433 ppm | 425 ppm |
12-12-2023 | 420 ppm | 434 ppm | 421 ppm |
11-12-2023 | 418 ppm | 428 ppm | 422 ppm |
10-12-2023 | 423 ppm | 438 ppm | 424 ppm |
09-12-2023 | 420 ppm | 436 ppm | 426 ppm |
08-12-2023 | 430ppm | 437 ppm | 438 ppm |
07-12-2023 | 431 ppm | 439 ppm | 438ppm |
06-12-2023 | 427 ppm | 436 ppm | 436 ppm |
05-12-2023 | 426 ppm | 433 ppm | 428 ppm |
04-12-2023 | 435 ppm | 445 ppm | 439 ppm |
03-12-2023 | 438 ppm | 453 ppm | 465 ppm |
02-12-2023 | 434ppm | 443 ppm | 442 ppm |
01-12-2023 | 444 ppm | 451 ppm | 459 ppm |
30-11-2023 | 447ppm | 464 ppm | 457 ppm |
29-11-2023 | 437 ppm | 437 ppm | 436 ppm |
28-Nov-2023 | 444 ppm | 448 ppm | 448 ppm |
27-Nov-2023 | 433 ppm | 436 ppm | 444 ppm |
26-Nov-2023 | 427 ppm | 435 ppm | 447 ppm |
25-Nov-2023 | 425 ppm | 430 ppm | 423 ppm |
24-Nov-2023 | 429 ppm | 442 ppm | 427 ppm |
23-Nov-2023 | 431 ppm | 442 ppm | 432 ppm |
22-Nov-2023 | 435 ppm | 437 ppm | 433 ppm |
21-Nov-2023 | 440 ppm | 436 ppm | 432 ppm |
Daily Averages – Phase 2 (See explanation of differences between Phase 1 and Phase 2 data)
For reference, latest monthly average (July 2023) from CSIRO for Kennaook/Cape Grim in NW Tasmania was 416.6 ppm. (Note – these are provisional values, subject to revision folllowing sensor re-calibrations and other checks.)
Date | Petrie Terrace | Chapel Hill | Bellbird Park |
19-Aug-2023 | — | 396 ppm | 398 ppm |
18-Aug-2023 | 421 ppm | 417 ppm | 418 ppm |
17-Aug-2023 | 436 ppm | 425 ppm | 426 ppm |
16-Aug-2023 | — | 421 ppm | 420 ppm |
15-Aug-2023 | — | 426 ppm | 419 ppm |
14-Aug-2023 | 436 ppm | 430 ppm | 430 ppm |
13-Aug-2023 | 438 ppm | 428 ppm | 423 ppm |
12-Aug-2023 | 436 ppm | 426 ppm | 433 ppm |
11-Aug-2023 | 438 ppm | 427 ppm | 430 ppm |
10-Aug-2023 | 437 ppm | 427 ppm | 430 ppm |
09-Aug-2023 | 431 ppm | 427 ppm | 433 ppm |
08-Aug-2023 | 427 ppm | 428 ppm | 436 ppm |
07-Aug-2023 | 431 ppm | 427 ppm | 432 ppm |
06-Aug-2023 | 431 ppm | 431 ppm | 433 ppm |
05-Aug-2023 | 432ppm | 431 ppm | 434 ppm |
04-Aug-2023 | 436 ppm | 433 ppm | 435 ppm |
03-Aug-2023 | 434 ppm | 432 ppm | 423 ppm |
02-Aug-2023 | 432 ppm | 433 ppm | 415 ppm |
01-Aug-2023 | 440 ppm | 436 ppm | 431 ppm |
31-Jul-2023 | 443 ppm | 431 ppm | 430ppm |
30-Jul-2023 | 433 ppm | 424 ppm | 430 ppm |
29-Jul-2023 | 434 ppm | 424 ppm | 431 ppm |
28-Jul-2023 | 431 ppm | 424 ppm | 426 ppm |
27-Jul-2023 | 429 ppm | 430 ppm | 433 ppm |
26-Jul-2023 | 432 ppm | 431 ppm | 430 ppm |
25-Jul-2023 | 427 ppm | 425 ppm | 424 ppm |
24-Jul-2023 | 420 ppm | 418 ppm | 418 ppm |
23-Jul-2023 | 424 ppm | 421 ppm | 420 ppm |
22-Jul-2023 | 434 ppm | 429 ppm | 428 ppm |
21-Jul-2023 | 446 ppm | 430 ppm | — |
20-Jul-2023 | 433 ppm | 430 ppm | — |
19-Jul-2023 | 437 ppm | 436 ppm | 439 ppm |
18-Jul-2023 | 443 ppm | 432ppm | 433 ppm |
17-Jul-2023 | 435 ppm | 432 ppm | 436 ppm |
16-Jul-2023 | 436 ppm | 432 ppm | 441 ppm |
15-Jul-2023 | 449 ppm | 434 ppm | 452 ppm |
14-Jul-2023 | 452 ppm | 435 ppm | 448 ppm |
13-Jul-2023 | 433 ppm | 431 ppm | 429 ppm |
12-Jul-2023 | 437 ppm | 437 ppm | 438 ppm |
11-Jul-2023 | 448 ppm | 434 ppm | 438 ppm |
10-Jul-2023 | 439 ppm | 424 ppm | 432 ppm |
9-Jul-2023 | 423 ppm | 411 ppm | 417 ppm |
8-Jul-2023 | 418 ppm | 411 ppm | 414 ppm |
7-Jul-2023 | 413 ppm | 407 ppm | 408 ppm |
6-Jul-2023 | 434 ppm | 427 ppm | 428 ppm |
5-Jul-2023 | 442 ppm | 441 ppm | 429 ppm |
4-Jul-2023 | 449 ppm | 443 ppm | 429 ppm |
3-Jul-2023 | 428 ppm | 429 ppm | 412 ppm |
2-Jul-2023 | 424 ppm | 425 ppm | 414 ppm |
1-Jul-2023 | 419 ppm | 407 ppm | 405 ppm |
30-Jun-2023 | 414 ppm | 405 ppm | 402 ppm |
29-Jun-2023 | 415 ppm | 409 ppm | 405 ppm |
28-Jun-2023 | 435 ppm | 427 ppm | 428 ppm |
27-Jun-2023 | 426 ppm | 409 ppm | 415 ppm |
26-Jun-2023 | 412 ppm | 402 ppm | 412 ppm |
25-Jun-2023 | 447 ppm | 426 ppm | 429 ppm |
24-Jun-2023 | 427 ppm | 417 ppm | 423 ppm |
23-Jun-2023 | 434 ppm | 427 ppm | 435 ppm |
22-Jun-2023 | 442 ppm | 425 ppm | 436 ppm |
21-Jun-2023 | 443 ppm | 421 ppm | 437 ppm |
20-Jun-2023 | 421 ppm | 414 ppm | 417 ppm |
19-Jun-2023 | 430 ppm | 418 ppm | 419 ppm |
18-Jun-2023 | 436 ppm | 426 ppm | 434 ppm |
17-Jun-2023 | 440 ppm | 429 ppm | 437 ppm |
16-Jun-2023 | 438 ppm | 421 ppm | 433 ppm |
15-Jun-2023 | 433 ppm | 412 ppm | 428 ppm |
14-Jun-2023 | 435 ppm | 425 ppm | 438 ppm |
13-Jun-2023 | 441 ppm | 436 ppm | 442 ppm |
12-Jun-2023 | 442 ppm | 439 ppm | 448ppm |
11-Jun-2023 | 443 ppm | 441 ppm | 451 ppm |
10-Jun-2023 | 446 ppm | 432 ppm | 444 ppm |
9-Jun-2023 | 441 ppm | 428 ppm | 440ppm |