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

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 suspend the provision of data in part or whole of the following time slots by interruption of power supply and relevant facilities due to maintenance and inspection of equipment.

From 10:00 to 13:00 on Tuesday, October 24,2017 Hachioji
From 13:00 to 16:00 on Tuesday, October 24,2017 Adachi
From 10:00 to 13:00 on Wednesday, October 25,2017 Chofu
From 13:00 to 16:00 on Wednesday, October 25,2017 Ota
From 10:00 to 13:00 on Thursday, October 26,2017 Kodaira
From 13:00 to 16:00 on Thursday, October 26,2017 Edogawa
From 10:00 to 13:00 on Friday, October 27,2017 Shinjuku

We will suspend the provision of data in part or whole of the following time slots by interruption of power supply and relevant facilities due to maintenance and inspection of equipment.

From 8:00 to 19:00 on Saturday, October 28,2017






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
11:01-12:00, Tue., 17 Oct. 0.0480 0.0400 0.0438
10:01-11:00, Tue., 17 Oct. 0.0490 0.0387 0.0446
09:01-10:00, Tue., 17 Oct. 0.0471 0.0391 0.0438
08:01-09:00, Tue., 17 Oct. 0.0478 0.0397 0.0442
07:01-08:00, Tue., 17 Oct. 0.0478 0.0401 0.0445
06:01-07:00, Tue., 17 Oct. 0.0474 0.0408 0.0444
05:01-06:00, Tue., 17 Oct. 0.0504 0.0419 0.0461
04:01-05:00, Tue., 17 Oct. 0.0467 0.0402 0.0429
03:01-04:00, Tue., 17 Oct. 0.0507 0.0421 0.0468
02:01-03:00, Tue., 17 Oct. 0.0507 0.0432 0.0460
01:01-02:00, Tue., 17 Oct. 0.0502 0.0411 0.0458
00:01-01:00, Tue., 17 Oct. 0.0492 0.0415 0.0454
23:01-24:00, Mon., 16 Oct. 0.0504 0.0426 0.0460
22:01-23:00, Mon., 16 Oct. 0.0532 0.0433 0.0485
21:01-22:00, Mon., 16 Oct. 0.0504 0.0425 0.0462
20:01-21:00, Mon., 16 Oct. 0.0483 0.0407 0.0443
19:01-20:00, Mon., 16 Oct. 0.0546 0.0433 0.0479
18:01-19:00, Mon., 16 Oct. 0.0596 0.0496 0.0544
17:01-18:00, Mon., 16 Oct. 0.0628 0.0522 0.0578
16:01-17:00, Mon., 16 Oct. 0.0616 0.0543 0.0580
15:01-16:00, Mon., 16 Oct. 0.0617 0.0501 0.0561
14:01-15:00, Mon., 16 Oct. 0.0627 0.0508 0.0560
13:01-14:00, Mon., 16 Oct. 0.0620 0.0542 0.0569
12:01-13:00, Mon., 16 Oct. 0.0635 0.0483 0.0552
11:01-12:00, Mon., 16 Oct. 0.0571 0.0477 0.0527
10:01-11:00, Mon., 16 Oct. 0.0566 0.0478 0.0525
09:01-10:00, Mon., 16 Oct. 0.0576 0.0485 0.0540
08:01-09:00, Mon., 16 Oct. 0.0610 0.0507 0.0570
07:01-08:00, Mon., 16 Oct. 0.0641 0.0504 0.0567
06:01-07:00, Mon., 16 Oct. 0.0642 0.0549 0.0601
05:01-06:00, Mon., 16 Oct. 0.0644 0.0551 0.0591
04:01-05:00, Mon., 16 Oct. 0.0619 0.0520 0.0568
03:01-04:00, Mon., 16 Oct. 0.0601 0.0522 0.0560
02:01-03:00, Mon., 16 Oct. 0.0581 0.0505 0.0547
01:01-02:00, Mon., 16 Oct. 0.0576 0.0500 0.0540
00:01-01:00, Mon., 16 Oct. 0.0531 0.0464 0.0494
23:01-24:00, Sun., 15 Oct. 0.0517 0.0440 0.0475
22:01-23:00, Sun., 15 Oct. 0.0501 0.0430 0.0467
21:01-22:00, Sun., 15 Oct. 0.0485 0.0399 0.0446
20:01-21:00, Sun., 15 Oct. 0.0491 0.0374 0.0418
19:01-20:00, Sun., 15 Oct. 0.0431 0.0365 0.0401
18:01-19:00, Sun., 15 Oct. 0.0427 0.0364 0.0398
17:01-18:00, Sun., 15 Oct. 0.0442 0.0362 0.0401
16:01-17:00, Sun., 15 Oct. 0.0460 0.0370 0.0408
15:01-16:00, Sun., 15 Oct. 0.0449 0.0373 0.0414
14:01-15:00, Sun., 15 Oct. 0.0436 0.0378 0.0407
13:01-14:00, Sun., 15 Oct. 0.0463 0.0383 0.0413
12:01-13:00, Sun., 15 Oct. 0.0472 0.0400 0.0432
11:01-12:00, Sun., 15 Oct. 0.0466 0.0389 0.0426
10:01-11:00, Sun., 15 Oct. 0.0446 0.0371 0.0414
09:01-10:00, Sun., 15 Oct. 0.0463 0.0377 0.0426
08:01-09:00, Sun., 15 Oct. 0.0468 0.0400 0.0429
07:01-08:00, Sun., 15 Oct. 0.0460 0.0394 0.0427
06:01-07:00, Sun., 15 Oct. 0.0459 0.0362 0.0404
05:01-06:00, Sun., 15 Oct. 0.0438 0.0363 0.0398
04:01-05:00, Sun., 15 Oct. 0.0428 0.0364 0.0390
03:01-04:00, Sun., 15 Oct. 0.0422 0.0360 0.0387
02:01-03:00, Sun., 15 Oct. 0.0415 0.0363 0.0389
01:01-02:00, Sun., 15 Oct. 0.0435 0.0360 0.0389
00:01-01:00, Sun., 15 Oct. 0.0439 0.0364 0.0393
23:01-24:00, Sat., 14 Oct. 0.0422 0.0360 0.0389
22:01-23:00, Sat., 14 Oct. 0.0423 0.0359 0.0388
21:01-22:00, Sat., 14 Oct. 0.0433 0.0363 0.0396
20:01-21:00, Sat., 14 Oct. 0.0457 0.0364 0.0399
19:01-20:00, Sat., 14 Oct. 0.0438 0.0366 0.0406
18:01-19:00, Sat., 14 Oct. 0.0459 0.0380 0.0419
17:01-18:00, Sat., 14 Oct. 0.0454 0.0371 0.0413
16:01-17:00, Sat., 14 Oct. 0.0441 0.0366 0.0402
15:01-16:00, Sat., 14 Oct. 0.0427 0.0360 0.0390
14:01-15:00, Sat., 14 Oct. 0.0429 0.0347 0.0389
13:01-14:00, Sat., 14 Oct. 0.0428 0.0370 0.0399
12:01-13:00, Sat., 14 Oct. 0.0445 0.0379 0.0409
11:01-12:00, Sat., 14 Oct. 0.0439 0.0366 0.0394
10:01-11:00, Sat., 14 Oct. 0.0426 0.0365 0.0399
09:01-10:00, Sat., 14 Oct. 0.0452 0.0377 0.0409
08:01-09:00, Sat., 14 Oct. 0.0475 0.0393 0.0436
07:01-08:00, Sat., 14 Oct. 0.0474 0.0414 0.0449
06:01-07:00, Sat., 14 Oct. 0.0562 0.0426 0.0483
05:01-06:00, Sat., 14 Oct. 0.0598 0.0501 0.0555
04:01-05:00, Sat., 14 Oct. 0.0613 0.0510 0.0561
03:01-04:00, Sat., 14 Oct. 0.0607 0.0512 0.0562
02:01-03:00, Sat., 14 Oct. 0.0590 0.0483 0.0543
01:01-02:00, Sat., 14 Oct. 0.0567 0.0453 0.0505
00:01-01:00, Sat., 14 Oct. 0.0480 0.0373 0.0427
23:01-24:00, Fri., 13 Oct. 0.0449 0.0374 0.0409
22:01-23:00, Fri., 13 Oct. 0.0454 0.0364 0.0394
21:01-22:00, Fri., 13 Oct. 0.0438 0.0362 0.0395
20:01-21:00, Fri., 13 Oct. 0.0425 0.0360 0.0387
19:01-20:00, Fri., 13 Oct. 0.0429 0.0360 0.0398
18:01-19:00, Fri., 13 Oct. 0.0457 0.0385 0.0419
17:01-18:00, Fri., 13 Oct. 0.0496 0.0412 0.0450
16:01-17:00, Fri., 13 Oct. 0.0507 0.0374 0.0455
15:01-16:00, Fri., 13 Oct. 0.0453 0.0377 0.0406
14:01-15:00, Fri., 13 Oct. 0.0459 0.0360 0.0409
13:01-14:00, Fri., 13 Oct. 0.0477 0.0372 0.0418
12:01-13:00, Fri., 13 Oct. 0.0519 0.0405 0.0452
11:01-12:00, Fri., 13 Oct. 0.0543 0.0385 0.0475
10:01-11:00, Fri., 13 Oct. 0.0453 0.0396 0.0422
09:01-10:00, Fri., 13 Oct. 0.0485 0.0388 0.0446
08:01-09:00, Fri., 13 Oct. 0.0502 0.0420 0.0470
07:01-08:00, Fri., 13 Oct. 0.0502 0.0412 0.0452
06:01-07:00, Fri., 13 Oct. 0.0483 0.0395 0.0436
05:01-06:00, Fri., 13 Oct. 0.0439 0.0365 0.0399
04:01-05:00, Fri., 13 Oct. 0.0428 0.0361 0.0387
03:01-04:00, Fri., 13 Oct. 0.0434 0.0362 0.0388
02:01-03:00, Fri., 13 Oct. 0.0424 0.0367 0.0391
01:01-02:00, Fri., 13 Oct. 0.0446 0.0354 0.0392
00:01-01:00, Fri., 13 Oct. 0.0445 0.0368 0.0396
23:01-24:00, Thu., 12 Oct. 0.0437 0.0362 0.0406
22:01-23:00, Thu., 12 Oct. 0.0540 0.0408 0.0463
21:01-22:00, Thu., 12 Oct. 0.0574 0.0396 0.0517
20:01-21:00, Thu., 12 Oct. 0.0468 0.0392 0.0424
19:01-20:00, Thu., 12 Oct. 0.0473 0.0365 0.0412
18:01-19:00, Thu., 12 Oct. 0.0446 0.0366 0.0398
17:01-18:00, Thu., 12 Oct. 0.0432 0.0366 0.0395
16:01-17:00, Thu., 12 Oct. 0.0447 0.0370 0.0400
15:01-16:00, Thu., 12 Oct. 0.0433 0.0363 0.0395
14:01-15:00, Thu., 12 Oct. 0.0427 0.0367 0.0396
13:01-14:00, Thu., 12 Oct. 0.0437 0.0363 0.0398
12:01-13:00, Thu., 12 Oct. 0.0433 0.0364 0.0394
11:01-12:00, Thu., 12 Oct. 0.0445 0.0366 0.0393
10:01-11:00, Thu., 12 Oct. 0.0425 0.0360 0.0391
09:01-10:00, Thu., 12 Oct. 0.0426 0.0371 0.0397
08:01-09:00, Thu., 12 Oct. 0.0427 0.0360 0.0397
07:01-08:00, Thu., 12 Oct. 0.0432 0.0361 0.0394
06:01-07:00, Thu., 12 Oct. 0.0454 0.0365 0.0398
05:01-06:00, Thu., 12 Oct. 0.0438 0.0367 0.0399
04:01-05:00, Thu., 12 Oct. 0.0426 0.0361 0.0393
03:01-04:00, Thu., 12 Oct. 0.0425 0.0365 0.0392
02:01-03:00, Thu., 12 Oct. 0.0441 0.0361 0.0394
01:01-02:00, Thu., 12 Oct. 0.0433 0.0361 0.0393
00:01-01:00, Thu., 12 Oct. 0.0430 0.0362 0.0393
23:01-24:00, Wed., 11 Oct. 0.0421 0.0364 0.0393
22:01-23:00, Wed., 11 Oct. 0.0429 0.0357 0.0393
21:01-22:00, Wed., 11 Oct. 0.0435 0.0361 0.0394
20:01-21:00, Wed., 11 Oct. 0.0423 0.0362 0.0395
19:01-20:00, Wed., 11 Oct. 0.0431 0.0355 0.0392
18:01-19:00, Wed., 11 Oct. 0.0422 0.0365 0.0387
17:01-18:00, Wed., 11 Oct. 0.0432 0.0364 0.0389
16:01-17:00, Wed., 11 Oct. 0.0438 0.0365 0.0392
15:01-16:00, Wed., 11 Oct. 0.0432 0.0361 0.0391
14:01-15:00, Wed., 11 Oct. 0.0431 0.0360 0.0394
13:01-14:00, Wed., 11 Oct. 0.0434 0.0361 0.0392
12:01-13:00, Wed., 11 Oct. 0.0433 0.0365 0.0392
11:01-12:00, Wed., 11 Oct. 0.0432 0.0358 0.0394
10:01-11:00, Wed., 11 Oct. 0.0433 0.0358 0.0395
09:01-10:00, Wed., 11 Oct. 0.0432 0.0364 0.0397
08:01-09:00, Wed., 11 Oct. 0.0453 0.0367 0.0400
07:01-08:00, Wed., 11 Oct. 0.0439 0.0375 0.0406
06:01-07:00, Wed., 11 Oct. 0.0434 0.0363 0.0400
05:01-06:00, Wed., 11 Oct. 0.0458 0.0371 0.0407
04:01-05:00, Wed., 11 Oct. 0.0444 0.0376 0.0411
03:01-04:00, Wed., 11 Oct. 0.0443 0.0374 0.0410
02:01-03:00, Wed., 11 Oct. 0.0424 0.0365 0.0392
01:01-02:00, Wed., 11 Oct. 0.0434 0.0372 0.0400
00:01-01:00, Wed., 11 Oct. 0.0432 0.0363 0.0396
23:01-24:00, Tue., 10 Oct. 0.0415 0.0361 0.0390
22:01-23:00, Tue., 10 Oct. 0.0443 0.0365 0.0392
21:01-22:00, Tue., 10 Oct. 0.0420 0.0363 0.0391
20:01-21:00, Tue., 10 Oct. 0.0436 0.0357 0.0392
19:01-20:00, Tue., 10 Oct. 0.0427 0.0363 0.0389
18:01-19:00, Tue., 10 Oct. 0.0425 0.0357 0.0389
17:01-18:00, Tue., 10 Oct. 0.0422 0.0364 0.0389
16:01-17:00, Tue., 10 Oct. 0.0425 0.0366 0.0394
15:01-16:00, Tue., 10 Oct. 0.0429 0.0357 0.0391
14:01-15:00, Tue., 10 Oct. 0.0420 0.0364 0.0393
13:01-14:00, Tue., 10 Oct. 0.0439 0.0360 0.0395
12:01-13:00, Tue., 10 Oct. 0.0422 0.0365 0.0392
11:01-12:00, Tue., 10 Oct. 0.0441 0.0361 0.0393
10:01-11:00, Tue., 10 Oct. 0.0436 0.0362 0.0397
09:01-10:00, Tue., 10 Oct. 0.0439 0.0360 0.0396
08:01-09:00, Tue., 10 Oct. 0.0431 0.0361 0.0398
07:01-08:00, Tue., 10 Oct. 0.0433 0.0362 0.0396
06:01-07:00, Tue., 10 Oct. 0.0428 0.0361 0.0398
05:01-06:00, Tue., 10 Oct. 0.0439 0.0367 0.0398
04:01-05:00, Tue., 10 Oct. 0.0432 0.0362 0.0393
03:01-04:00, Tue., 10 Oct. 0.0440 0.0367 0.0398
02:01-03:00, Tue., 10 Oct. 0.0415 0.0348 0.0389
01:01-02:00, Tue., 10 Oct. 0.0429 0.0362 0.0387
00:01-01:00, Tue., 10 Oct. 0.0422 0.0364 0.0386
23:01-24:00, Mon., 09 Oct. 0.0423 0.0362 0.0387
22:01-23:00, Mon., 09 Oct. 0.0424 0.0361 0.0386
21:01-22:00, Mon., 09 Oct. 0.0447 0.0353 0.0386
20:01-21:00, Mon., 09 Oct. 0.0426 0.0365 0.0393
19:01-20:00, Mon., 09 Oct. 0.0414 0.0358 0.0383
18:01-19:00, Mon., 09 Oct. 0.0419 0.0360 0.0385
17:01-18:00, Mon., 09 Oct. 0.0416 0.0352 0.0386
16:01-17:00, Mon., 09 Oct. 0.0421 0.0353 0.0386
15:01-16:00, Mon., 09 Oct. 0.0414 0.0359 0.0384
14:01-15:00, Mon., 09 Oct. 0.0423 0.0360 0.0388
13:01-14:00, Mon., 09 Oct. 0.0421 0.0359 0.0383
12:01-13:00, Mon., 09 Oct. 0.0428 0.0361 0.0385
11:01-12:00, Mon., 09 Oct. 0.0410 0.0363 0.0382
10:01-11:00, Mon., 09 Oct. 0.0428 0.0361 0.0388
09:01-10:00, Mon., 09 Oct. 0.0415 0.0361 0.0388
08:01-09:00, Mon., 09 Oct. 0.0422 0.0364 0.0387
07:01-08:00, Mon., 09 Oct. 0.0452 0.0359 0.0387
06:01-07:00, Mon., 09 Oct. 0.0411 0.0361 0.0386
05:01-06:00, Mon., 09 Oct. 0.0411 0.0359 0.0388
04:01-05:00, Mon., 09 Oct. 0.0425 0.0360 0.0382
03:01-04:00, Mon., 09 Oct. 0.0435 0.0361 0.0383
02:01-03:00, Mon., 09 Oct. 0.0413 0.0358 0.0384
01:01-02:00, Mon., 09 Oct. 0.0417 0.0354 0.0384
00:01-01:00, Mon., 09 Oct. 0.0418 0.0355 0.0382
23:01-24:00, Sun., 08 Oct. 0.0412 0.0363 0.0380
22:01-23:00, Sun., 08 Oct. 0.0424 0.0357 0.0386
21:01-22:00, Sun., 08 Oct. 0.0416 0.0360 0.0384
20:01-21:00, Sun., 08 Oct. 0.0425 0.0360 0.0390
19:01-20:00, Sun., 08 Oct. 0.0419 0.0361 0.0386
18:01-19:00, Sun., 08 Oct. 0.0419 0.0352 0.0386
17:01-18:00, Sun., 08 Oct. 0.0426 0.0360 0.0384
16:01-17:00, Sun., 08 Oct. 0.0425 0.0366 0.0387
15:01-16:00, Sun., 08 Oct. 0.0423 0.0345 0.0386
14:01-15:00, Sun., 08 Oct. 0.0430 0.0360 0.0385
13:01-14:00, Sun., 08 Oct. 0.0424 0.0358 0.0384
12:01-13:00, Sun., 08 Oct. 0.0435 0.0356 0.0387
11:01-12:00, Sun., 08 Oct. 0.0421 0.0362 0.0389
10:01-11:00, Sun., 08 Oct. 0.0427 0.0365 0.0393
09:01-10:00, Sun., 08 Oct. 0.0425 0.0365 0.0394
08:01-09:00, Sun., 08 Oct. 0.0428 0.0361 0.0389
07:01-08:00, Sun., 08 Oct. 0.0425 0.0365 0.0391
06:01-07:00, Sun., 08 Oct. 0.0428 0.0368 0.0393
05:01-06:00, Sun., 08 Oct. 0.0424 0.0364 0.0390
04:01-05:00, Sun., 08 Oct. 0.0431 0.0359 0.0386
03:01-04:00, Sun., 08 Oct. 0.0451 0.0357 0.0385
02:01-03:00, Sun., 08 Oct. 0.0422 0.0356 0.0384
01:01-02:00, Sun., 08 Oct. 0.0419 0.0353 0.0384
00:01-01:00, Sun., 08 Oct. 0.0417 0.0356 0.0380
23:01-24:00, Sat., 07 Oct. 0.0427 0.0347 0.0383
22:01-23:00, Sat., 07 Oct. 0.0429 0.0360 0.0385
21:01-22:00, Sat., 07 Oct. 0.0418 0.0355 0.0383
20:01-21:00, Sat., 07 Oct. 0.0418 0.0353 0.0386
19:01-20:00, Sat., 07 Oct. 0.0423 0.0363 0.0383
18:01-19:00, Sat., 07 Oct. 0.0419 0.0360 0.0381
17:01-18:00, Sat., 07 Oct. 0.0421 0.0358 0.0385
16:01-17:00, Sat., 07 Oct. 0.0415 0.0357 0.0382
15:01-16:00, Sat., 07 Oct. 0.0423 0.0353 0.0384
14:01-15:00, Sat., 07 Oct. 0.0423 0.0356 0.0383
13:01-14:00, Sat., 07 Oct. 0.0413 0.0357 0.0388
12:01-13:00, Sat., 07 Oct. 0.0425 0.0362 0.0386