Radiation doses in the air / Measurement results by the hour (Edogawa)

We continuously measure radiation doses in the air (air absorbed doses per hour) at monitoring posts. Measurement results can be obtained by the minute, and we gather measurement data and then display them by the hour or by the day.

The maximum value indicates the largest value measured in each time slot (during the hour or during the day), the minimum value the smallest value measured in each time slot, and the average value is the average value for each time slot.

News about this monitoring post

We will update the monitoring post from Wednesday, March 8 to Thursday, March 9, 2023. Since it is not possible to measure the radiation dose in the atmosphere during the update work, the provision of measurement results will be temporarily suspended at the following monitoring posts.

Adachi Bureau (Toneri Park) Wednesday, March 8, from around 8 a.m. to 6 p.m.
Chofu Bureau (Chofu Airfield) Thursday, March 9, from 8 a.m. to 6 p.m.


On Friday, March 10, 2023, from around 9 a.m. to around noon, maintenance and inspection of the Kodaira Bureau (Medicinal Botanical Garden) will be conducted.
Since the amount of radiation in the atmosphere cannot be measured during maintenance and inspection, the provision of measurement results is temporarily suspended.

Shown in µGy/h (microgray per hour)

Gray indicates an amount of energy (absorbed dose) when radiation hits a material object, and 1 gray (Gy) of radiation doses in the air can be converted to 1 sievert (Sv).

Measurement time Dose rate
μGy/h (microgray per hour)
Maximum value Minimum value Average value
15:01-16:00, Fri., 02 Jun. 0.0413 0.0364 0.0386
14:01-15:00, Fri., 02 Jun. 0.0427 0.0362 0.0394
13:01-14:00, Fri., 02 Jun. 0.0429 0.0366 0.0394
12:01-13:00, Fri., 02 Jun. 0.0425 0.0365 0.0389
11:01-12:00, Fri., 02 Jun. 0.0425 0.0366 0.0394
10:01-11:00, Fri., 02 Jun. 0.0429 0.0361 0.0390
09:01-10:00, Fri., 02 Jun. 0.0440 0.0367 0.0402
08:01-09:00, Fri., 02 Jun. 0.0453 0.0390 0.0418
07:01-08:00, Fri., 02 Jun. 0.0459 0.0404 0.0433
06:01-07:00, Fri., 02 Jun. 0.0476 0.0410 0.0438
05:01-06:00, Fri., 02 Jun. 0.0506 0.0416 0.0456
04:01-05:00, Fri., 02 Jun. 0.0517 0.0439 0.0475
03:01-04:00, Fri., 02 Jun. 0.0508 0.0415 0.0460
02:01-03:00, Fri., 02 Jun. 0.0493 0.0419 0.0448
01:01-02:00, Fri., 02 Jun. 0.0475 0.0411 0.0444
00:01-01:00, Fri., 02 Jun. 0.0477 0.0378 0.0418
23:01-24:00, Thu., 01 Jun. 0.0434 0.0371 0.0399
22:01-23:00, Thu., 01 Jun. 0.0428 0.0371 0.0398
21:01-22:00, Thu., 01 Jun. 0.0434 0.0365 0.0397
20:01-21:00, Thu., 01 Jun. 0.0430 0.0368 0.0399
19:01-20:00, Thu., 01 Jun. 0.0441 0.0369 0.0398
18:01-19:00, Thu., 01 Jun. 0.0415 0.0364 0.0393
17:01-18:00, Thu., 01 Jun. 0.0431 0.0367 0.0398
16:01-17:00, Thu., 01 Jun. 0.0436 0.0361 0.0392
15:01-16:00, Thu., 01 Jun. 0.0433 0.0364 0.0395
14:01-15:00, Thu., 01 Jun. 0.0423 0.0365 0.0394
13:01-14:00, Thu., 01 Jun. 0.0423 0.0369 0.0395
12:01-13:00, Thu., 01 Jun. 0.0424 0.0364 0.0394
11:01-12:00, Thu., 01 Jun. 0.0419 0.0372 0.0395
10:01-11:00, Thu., 01 Jun. 0.0434 0.0362 0.0393
09:01-10:00, Thu., 01 Jun. 0.0422 0.0363 0.0390
08:01-09:00, Thu., 01 Jun. 0.0421 0.0367 0.0393
07:01-08:00, Thu., 01 Jun. 0.0430 0.0370 0.0396
06:01-07:00, Thu., 01 Jun. 0.0431 0.0366 0.0395
05:01-06:00, Thu., 01 Jun. 0.0439 0.0365 0.0390
04:01-05:00, Thu., 01 Jun. 0.0432 0.0365 0.0391
03:01-04:00, Thu., 01 Jun. 0.0420 0.0365 0.0391
02:01-03:00, Thu., 01 Jun. 0.0418 0.0364 0.0392
01:01-02:00, Thu., 01 Jun. 0.0430 0.0364 0.0391
00:01-01:00, Thu., 01 Jun. 0.0428 0.0368 0.0393
23:01-24:00, Wed., 31 May. 0.0421 0.0364 0.0393
22:01-23:00, Wed., 31 May. 0.0417 0.0364 0.0392
21:01-22:00, Wed., 31 May. 0.0443 0.0367 0.0394
20:01-21:00, Wed., 31 May. 0.0423 0.0361 0.0395
19:01-20:00, Wed., 31 May. 0.0427 0.0366 0.0395
18:01-19:00, Wed., 31 May. 0.0417 0.0363 0.0391
17:01-18:00, Wed., 31 May. 0.0414 0.0364 0.0388
16:01-17:00, Wed., 31 May. 0.0426 0.0365 0.0393
15:01-16:00, Wed., 31 May. 0.0435 0.0360 0.0391
14:01-15:00, Wed., 31 May. 0.0417 0.0370 0.0391
13:01-14:00, Wed., 31 May. 0.0429 0.0369 0.0397
12:01-13:00, Wed., 31 May. 0.0442 0.0360 0.0397
11:01-12:00, Wed., 31 May. 0.0422 0.0365 0.0390
10:01-11:00, Wed., 31 May. 0.0414 0.0364 0.0389
09:01-10:00, Wed., 31 May. 0.0426 0.0369 0.0390
08:01-09:00, Wed., 31 May. 0.0425 0.0359 0.0395
07:01-08:00, Wed., 31 May. 0.0426 0.0366 0.0394
06:01-07:00, Wed., 31 May. 0.0422 0.0369 0.0390
05:01-06:00, Wed., 31 May. 0.0432 0.0363 0.0392
04:01-05:00, Wed., 31 May. 0.0428 0.0367 0.0397
03:01-04:00, Wed., 31 May. 0.0436 0.0368 0.0406
02:01-03:00, Wed., 31 May. 0.0470 0.0368 0.0402
01:01-02:00, Wed., 31 May. 0.0421 0.0361 0.0395
00:01-01:00, Wed., 31 May. 0.0424 0.0361 0.0390
23:01-24:00, Tue., 30 May. 0.0434 0.0368 0.0392
22:01-23:00, Tue., 30 May. 0.0417 0.0363 0.0391
21:01-22:00, Tue., 30 May. 0.0420 0.0366 0.0391
20:01-21:00, Tue., 30 May. 0.0430 0.0367 0.0394
19:01-20:00, Tue., 30 May. 0.0423 0.0366 0.0388
18:01-19:00, Tue., 30 May. 0.0432 0.0366 0.0392
17:01-18:00, Tue., 30 May. 0.0424 0.0369 0.0395
16:01-17:00, Tue., 30 May. 0.0437 0.0366 0.0389
15:01-16:00, Tue., 30 May. 0.0419 0.0367 0.0395
14:01-15:00, Tue., 30 May. 0.0422 0.0367 0.0389
13:01-14:00, Tue., 30 May. 0.0431 0.0368 0.0395
12:01-13:00, Tue., 30 May. 0.0428 0.0366 0.0393
11:01-12:00, Tue., 30 May. 0.0426 0.0364 0.0399
10:01-11:00, Tue., 30 May. 0.0440 0.0377 0.0402
09:01-10:00, Tue., 30 May. 0.0447 0.0368 0.0407
08:01-09:00, Tue., 30 May. 0.0456 0.0389 0.0425
07:01-08:00, Tue., 30 May. 0.0456 0.0380 0.0428
06:01-07:00, Tue., 30 May. 0.0455 0.0393 0.0425
05:01-06:00, Tue., 30 May. 0.0457 0.0384 0.0419
04:01-05:00, Tue., 30 May. 0.0462 0.0389 0.0425
03:01-04:00, Tue., 30 May. 0.0487 0.0414 0.0447
02:01-03:00, Tue., 30 May. 0.0508 0.0367 0.0429
01:01-02:00, Tue., 30 May. 0.0437 0.0375 0.0404
00:01-01:00, Tue., 30 May. 0.0464 0.0389 0.0430
23:01-24:00, Mon., 29 May. 0.0522 0.0421 0.0465
22:01-23:00, Mon., 29 May. 0.0585 0.0480 0.0522
21:01-22:00, Mon., 29 May. 0.0606 0.0507 0.0560
20:01-21:00, Mon., 29 May. 0.0608 0.0516 0.0565
19:01-20:00, Mon., 29 May. 0.0558 0.0405 0.0473
18:01-19:00, Mon., 29 May. 0.0472 0.0412 0.0444
17:01-18:00, Mon., 29 May. 0.0505 0.0428 0.0464
16:01-17:00, Mon., 29 May. 0.0504 0.0436 0.0470
15:01-16:00, Mon., 29 May. 0.0521 0.0445 0.0471
14:01-15:00, Mon., 29 May. 0.0495 0.0403 0.0452
13:01-14:00, Mon., 29 May. 0.0438 0.0374 0.0406
12:01-13:00, Mon., 29 May. 0.0445 0.0380 0.0412
11:01-12:00, Mon., 29 May. 0.0464 0.0398 0.0433
10:01-11:00, Mon., 29 May. 0.0505 0.0431 0.0470
09:01-10:00, Mon., 29 May. 0.0529 0.0435 0.0478
08:01-09:00, Mon., 29 May. 0.0521 0.0416 0.0457
07:01-08:00, Mon., 29 May. 0.0481 0.0423 0.0449
06:01-07:00, Mon., 29 May. 0.0503 0.0425 0.0465
05:01-06:00, Mon., 29 May. 0.0509 0.0457 0.0479
04:01-05:00, Mon., 29 May. 0.0519 0.0436 0.0475
03:01-04:00, Mon., 29 May. 0.0460 0.0399 0.0435
02:01-03:00, Mon., 29 May. 0.0452 0.0382 0.0428
01:01-02:00, Mon., 29 May. 0.0453 0.0380 0.0415
00:01-01:00, Mon., 29 May. 0.0453 0.0375 0.0416
23:01-24:00, Sun., 28 May. 0.0460 0.0387 0.0422
22:01-23:00, Sun., 28 May. 0.0497 0.0410 0.0451
21:01-22:00, Sun., 28 May. 0.0510 0.0389 0.0427
20:01-21:00, Sun., 28 May. 0.0448 0.0387 0.0411
19:01-20:00, Sun., 28 May. 0.0431 0.0359 0.0402
18:01-19:00, Sun., 28 May. 0.0427 0.0370 0.0401
17:01-18:00, Sun., 28 May. 0.0433 0.0369 0.0400
16:01-17:00, Sun., 28 May. 0.0426 0.0367 0.0397
15:01-16:00, Sun., 28 May. 0.0427 0.0367 0.0393
14:01-15:00, Sun., 28 May. 0.0426 0.0368 0.0394
13:01-14:00, Sun., 28 May. 0.0436 0.0366 0.0398
12:01-13:00, Sun., 28 May. 0.0425 0.0358 0.0398
11:01-12:00, Sun., 28 May. 0.0422 0.0366 0.0394
10:01-11:00, Sun., 28 May. 0.0423 0.0370 0.0398
09:01-10:00, Sun., 28 May. 0.0427 0.0370 0.0398
08:01-09:00, Sun., 28 May. 0.0423 0.0361 0.0399
07:01-08:00, Sun., 28 May. 0.0432 0.0370 0.0399
06:01-07:00, Sun., 28 May. 0.0434 0.0377 0.0400
05:01-06:00, Sun., 28 May. 0.0437 0.0369 0.0399
04:01-05:00, Sun., 28 May. 0.0426 0.0367 0.0395
03:01-04:00, Sun., 28 May. 0.0425 0.0369 0.0395
02:01-03:00, Sun., 28 May. 0.0426 0.0364 0.0400
01:01-02:00, Sun., 28 May. 0.0418 0.0367 0.0396
00:01-01:00, Sun., 28 May. 0.0424 0.0372 0.0397
23:01-24:00, Sat., 27 May. 0.0431 0.0366 0.0398
22:01-23:00, Sat., 27 May. 0.0432 0.0365 0.0398
21:01-22:00, Sat., 27 May. 0.0428 0.0363 0.0394
20:01-21:00, Sat., 27 May. 0.0429 0.0369 0.0396
19:01-20:00, Sat., 27 May. 0.0419 0.0366 0.0396
18:01-19:00, Sat., 27 May. 0.0432 0.0365 0.0399
17:01-18:00, Sat., 27 May. 0.0436 0.0371 0.0402
16:01-17:00, Sat., 27 May. 0.0426 0.0366 0.0394
15:01-16:00, Sat., 27 May. 0.0428 0.0369 0.0397
14:01-15:00, Sat., 27 May. 0.0432 0.0371 0.0399
13:01-14:00, Sat., 27 May. 0.0419 0.0366 0.0396
12:01-13:00, Sat., 27 May. 0.0427 0.0360 0.0395
11:01-12:00, Sat., 27 May. 0.0442 0.0373 0.0399
10:01-11:00, Sat., 27 May. 0.0427 0.0360 0.0396
09:01-10:00, Sat., 27 May. 0.0420 0.0372 0.0397
08:01-09:00, Sat., 27 May. 0.0430 0.0366 0.0397
07:01-08:00, Sat., 27 May. 0.0429 0.0365 0.0398
06:01-07:00, Sat., 27 May. 0.0430 0.0371 0.0399
05:01-06:00, Sat., 27 May. 0.0431 0.0370 0.0395
04:01-05:00, Sat., 27 May. 0.0429 0.0371 0.0395
03:01-04:00, Sat., 27 May. 0.0428 0.0363 0.0392
02:01-03:00, Sat., 27 May. 0.0420 0.0369 0.0396
01:01-02:00, Sat., 27 May. 0.0432 0.0370 0.0398
00:01-01:00, Sat., 27 May. 0.0424 0.0363 0.0394
23:01-24:00, Fri., 26 May. 0.0423 0.0361 0.0393
22:01-23:00, Fri., 26 May. 0.0440 0.0369 0.0396
21:01-22:00, Fri., 26 May. 0.0427 0.0364 0.0392
20:01-21:00, Fri., 26 May. 0.0424 0.0366 0.0396
19:01-20:00, Fri., 26 May. 0.0423 0.0364 0.0397
18:01-19:00, Fri., 26 May. 0.0421 0.0368 0.0395
17:01-18:00, Fri., 26 May. 0.0417 0.0373 0.0393
16:01-17:00, Fri., 26 May. 0.0428 0.0363 0.0393
15:01-16:00, Fri., 26 May. 0.0427 0.0360 0.0394
14:01-15:00, Fri., 26 May. 0.0435 0.0367 0.0396
13:01-14:00, Fri., 26 May. 0.0422 0.0364 0.0395
12:01-13:00, Fri., 26 May. 0.0438 0.0368 0.0399
11:01-12:00, Fri., 26 May. 0.0421 0.0368 0.0393
10:01-11:00, Fri., 26 May. 0.0426 0.0363 0.0390
09:01-10:00, Fri., 26 May. 0.0420 0.0361 0.0392
08:01-09:00, Fri., 26 May. 0.0431 0.0365 0.0394
07:01-08:00, Fri., 26 May. 0.0422 0.0364 0.0393
06:01-07:00, Fri., 26 May. 0.0420 0.0366 0.0391
05:01-06:00, Fri., 26 May. 0.0425 0.0364 0.0395
04:01-05:00, Fri., 26 May. 0.0416 0.0358 0.0391
03:01-04:00, Fri., 26 May. 0.0428 0.0369 0.0395
02:01-03:00, Fri., 26 May. 0.0424 0.0362 0.0392
01:01-02:00, Fri., 26 May. 0.0417 0.0367 0.0392
00:01-01:00, Fri., 26 May. 0.0420 0.0361 0.0390
23:01-24:00, Thu., 25 May. 0.0422 0.0367 0.0390
22:01-23:00, Thu., 25 May. 0.0418 0.0366 0.0394
21:01-22:00, Thu., 25 May. 0.0417 0.0368 0.0391
20:01-21:00, Thu., 25 May. 0.0420 0.0364 0.0392
19:01-20:00, Thu., 25 May. 0.0414 0.0363 0.0391
18:01-19:00, Thu., 25 May. 0.0427 0.0364 0.0395
17:01-18:00, Thu., 25 May. 0.0413 0.0359 0.0392
16:01-17:00, Thu., 25 May. 0.0424 0.0366 0.0389
15:01-16:00, Thu., 25 May. 0.0435 0.0366 0.0396
14:01-15:00, Thu., 25 May. 0.0422 0.0367 0.0394
13:01-14:00, Thu., 25 May. 0.0425 0.0363 0.0389
12:01-13:00, Thu., 25 May. 0.0420 0.0364 0.0389
11:01-12:00, Thu., 25 May. 0.0420 0.0361 0.0388
10:01-11:00, Thu., 25 May. 0.0414 0.0367 0.0392
09:01-10:00, Thu., 25 May. 0.0424 0.0365 0.0392
08:01-09:00, Thu., 25 May. 0.0433 0.0360 0.0396
07:01-08:00, Thu., 25 May. 0.0427 0.0365 0.0396
06:01-07:00, Thu., 25 May. 0.0421 0.0366 0.0395
05:01-06:00, Thu., 25 May. 0.0418 0.0359 0.0391
04:01-05:00, Thu., 25 May. 0.0419 0.0360 0.0392
03:01-04:00, Thu., 25 May. 0.0419 0.0366 0.0390
02:01-03:00, Thu., 25 May. 0.0418 0.0368 0.0391
01:01-02:00, Thu., 25 May. 0.0415 0.0367 0.0391
00:01-01:00, Thu., 25 May. 0.0428 0.0368 0.0394
23:01-24:00, Wed., 24 May. 0.0419 0.0359 0.0391
22:01-23:00, Wed., 24 May. 0.0418 0.0364 0.0387
21:01-22:00, Wed., 24 May. 0.0421 0.0364 0.0388
20:01-21:00, Wed., 24 May. 0.0417 0.0365 0.0390
19:01-20:00, Wed., 24 May. 0.0419 0.0362 0.0390
18:01-19:00, Wed., 24 May. 0.0435 0.0364 0.0393
17:01-18:00, Wed., 24 May. 0.0418 0.0367 0.0389
16:01-17:00, Wed., 24 May. 0.0425 0.0369 0.0393
15:01-16:00, Wed., 24 May. 0.0437 0.0366 0.0388
14:01-15:00, Wed., 24 May. 0.0418 0.0360 0.0390
13:01-14:00, Wed., 24 May. 0.0425 0.0361 0.0389
12:01-13:00, Wed., 24 May. 0.0427 0.0364 0.0391
11:01-12:00, Wed., 24 May. 0.0427 0.0362 0.0388
10:01-11:00, Wed., 24 May. 0.0426 0.0363 0.0387
09:01-10:00, Wed., 24 May. 0.0435 0.0362 0.0391
08:01-09:00, Wed., 24 May. 0.0410 0.0362 0.0385
07:01-08:00, Wed., 24 May. 0.0416 0.0363 0.0387
06:01-07:00, Wed., 24 May. 0.0424 0.0360 0.0390
05:01-06:00, Wed., 24 May. 0.0419 0.0363 0.0384
04:01-05:00, Wed., 24 May. 0.0424 0.0366 0.0388
03:01-04:00, Wed., 24 May. 0.0417 0.0365 0.0385
02:01-03:00, Wed., 24 May. 0.0413 0.0360 0.0387
01:01-02:00, Wed., 24 May. 0.0421 0.0366 0.0390
00:01-01:00, Wed., 24 May. 0.0433 0.0363 0.0401
23:01-24:00, Tue., 23 May. 0.0471 0.0397 0.0423
22:01-23:00, Tue., 23 May. 0.0514 0.0443 0.0476
21:01-22:00, Tue., 23 May. 0.0515 0.0358 0.0409
20:01-21:00, Tue., 23 May. 0.0423 0.0375 0.0398
19:01-20:00, Tue., 23 May. 0.0434 0.0357 0.0393
18:01-19:00, Tue., 23 May. 0.0443 0.0364 0.0399
17:01-18:00, Tue., 23 May. 0.0446 0.0391 0.0421
16:01-17:00, Tue., 23 May. 0.0570 0.0417 0.0483