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, Mon., 11 Dec. 0.0415 0.0351 0.0372
10:01-11:00, Mon., 11 Dec. 0.0415 0.0351 0.0369
09:01-10:00, Mon., 11 Dec. 0.0412 0.0347 0.0373
08:01-09:00, Mon., 11 Dec. 0.0412 0.0356 0.0376
07:01-08:00, Mon., 11 Dec. 0.0418 0.0354 0.0379
06:01-07:00, Mon., 11 Dec. 0.0425 0.0354 0.0381
05:01-06:00, Mon., 11 Dec. 0.0408 0.0356 0.0382
04:01-05:00, Mon., 11 Dec. 0.0416 0.0351 0.0374
03:01-04:00, Mon., 11 Dec. 0.0410 0.0342 0.0372
02:01-03:00, Mon., 11 Dec. 0.0396 0.0348 0.0371
01:01-02:00, Mon., 11 Dec. 0.0400 0.0347 0.0373
00:01-01:00, Mon., 11 Dec. 0.0403 0.0350 0.0370
23:01-24:00, Sun., 10 Dec. 0.0405 0.0338 0.0367
22:01-23:00, Sun., 10 Dec. 0.0395 0.0347 0.0368
21:01-22:00, Sun., 10 Dec. 0.0404 0.0345 0.0369
20:01-21:00, Sun., 10 Dec. 0.0410 0.0348 0.0370
19:01-20:00, Sun., 10 Dec. 0.0401 0.0339 0.0366
18:01-19:00, Sun., 10 Dec. 0.0410 0.0343 0.0368
17:01-18:00, Sun., 10 Dec. 0.0389 0.0343 0.0364
16:01-17:00, Sun., 10 Dec. 0.0388 0.0345 0.0362
15:01-16:00, Sun., 10 Dec. 0.0393 0.0343 0.0362
14:01-15:00, Sun., 10 Dec. 0.0418 0.0337 0.0366
13:01-14:00, Sun., 10 Dec. 0.0401 0.0348 0.0371
12:01-13:00, Sun., 10 Dec. 0.0405 0.0346 0.0370
11:01-12:00, Sun., 10 Dec. 0.0400 0.0351 0.0373
10:01-11:00, Sun., 10 Dec. 0.0406 0.0347 0.0377
09:01-10:00, Sun., 10 Dec. 0.0408 0.0357 0.0376
08:01-09:00, Sun., 10 Dec. 0.0427 0.0354 0.0374
07:01-08:00, Sun., 10 Dec. 0.0415 0.0355 0.0378
06:01-07:00, Sun., 10 Dec. 0.0418 0.0353 0.0377
05:01-06:00, Sun., 10 Dec. 0.0403 0.0354 0.0375
04:01-05:00, Sun., 10 Dec. 0.0405 0.0350 0.0374
03:01-04:00, Sun., 10 Dec. 0.0396 0.0348 0.0371
02:01-03:00, Sun., 10 Dec. 0.0402 0.0348 0.0372
01:01-02:00, Sun., 10 Dec. 0.0406 0.0352 0.0375
00:01-01:00, Sun., 10 Dec. 0.0406 0.0349 0.0369
23:01-24:00, Sat., 09 Dec. 0.0397 0.0349 0.0370
22:01-23:00, Sat., 09 Dec. 0.0399 0.0350 0.0366
21:01-22:00, Sat., 09 Dec. 0.0406 0.0342 0.0366
20:01-21:00, Sat., 09 Dec. 0.0395 0.0345 0.0363
19:01-20:00, Sat., 09 Dec. 0.0400 0.0346 0.0363
18:01-19:00, Sat., 09 Dec. 0.0407 0.0344 0.0363
17:01-18:00, Sat., 09 Dec. 0.0411 0.0342 0.0364
16:01-17:00, Sat., 09 Dec. 0.0396 0.0336 0.0365
15:01-16:00, Sat., 09 Dec. 0.0397 0.0339 0.0363
14:01-15:00, Sat., 09 Dec. 0.0407 0.0341 0.0366
13:01-14:00, Sat., 09 Dec. 0.0385 0.0343 0.0363
12:01-13:00, Sat., 09 Dec. 0.0399 0.0350 0.0365
11:01-12:00, Sat., 09 Dec. 0.0387 0.0348 0.0363
10:01-11:00, Sat., 09 Dec. 0.0388 0.0330 0.0363
09:01-10:00, Sat., 09 Dec. 0.0381 0.0347 0.0364
08:01-09:00, Sat., 09 Dec. 0.0405 0.0340 0.0364
07:01-08:00, Sat., 09 Dec. 0.0392 0.0344 0.0364
06:01-07:00, Sat., 09 Dec. 0.0392 0.0339 0.0364
05:01-06:00, Sat., 09 Dec. 0.0401 0.0345 0.0365
04:01-05:00, Sat., 09 Dec. 0.0390 0.0349 0.0366
03:01-04:00, Sat., 09 Dec. 0.0410 0.0342 0.0365
02:01-03:00, Sat., 09 Dec. 0.0395 0.0340 0.0364
01:01-02:00, Sat., 09 Dec. 0.0392 0.0346 0.0367
00:01-01:00, Sat., 09 Dec. 0.0405 0.0348 0.0368
23:01-24:00, Fri., 08 Dec. 0.0423 0.0360 0.0390
22:01-23:00, Fri., 08 Dec. 0.0519 0.0371 0.0442
21:01-22:00, Fri., 08 Dec. 0.0611 0.0481 0.0544
20:01-21:00, Fri., 08 Dec. 0.0636 0.0511 0.0562
19:01-20:00, Fri., 08 Dec. 0.0558 0.0469 0.0513
18:01-19:00, Fri., 08 Dec. 0.0544 0.0362 0.0454
17:01-18:00, Fri., 08 Dec. 0.0422 0.0356 0.0384
16:01-17:00, Fri., 08 Dec. 0.0415 0.0355 0.0381
15:01-16:00, Fri., 08 Dec. 0.0424 0.0359 0.0379
14:01-15:00, Fri., 08 Dec. 0.0425 0.0359 0.0382
13:01-14:00, Fri., 08 Dec. 0.0413 0.0355 0.0381
12:01-13:00, Fri., 08 Dec. 0.0422 0.0364 0.0388
11:01-12:00, Fri., 08 Dec. 0.0430 0.0357 0.0385
10:01-11:00, Fri., 08 Dec. 0.0430 0.0359 0.0389
09:01-10:00, Fri., 08 Dec. 0.0428 0.0363 0.0388
08:01-09:00, Fri., 08 Dec. 0.0412 0.0357 0.0381
07:01-08:00, Fri., 08 Dec. 0.0407 0.0360 0.0379
06:01-07:00, Fri., 08 Dec. 0.0430 0.0354 0.0385
05:01-06:00, Fri., 08 Dec. 0.0432 0.0353 0.0379
04:01-05:00, Fri., 08 Dec. 0.0414 0.0354 0.0382
03:01-04:00, Fri., 08 Dec. 0.0411 0.0353 0.0377
02:01-03:00, Fri., 08 Dec. 0.0427 0.0348 0.0374
01:01-02:00, Fri., 08 Dec. 0.0402 0.0350 0.0372
00:01-01:00, Fri., 08 Dec. 0.0412 0.0355 0.0372
23:01-24:00, Thu., 07 Dec. 0.0403 0.0344 0.0370
22:01-23:00, Thu., 07 Dec. 0.0395 0.0349 0.0368
21:01-22:00, Thu., 07 Dec. 0.0416 0.0349 0.0372
20:01-21:00, Thu., 07 Dec. 0.0402 0.0338 0.0365
19:01-20:00, Thu., 07 Dec. 0.0393 0.0348 0.0365
18:01-19:00, Thu., 07 Dec. 0.0404 0.0344 0.0365
17:01-18:00, Thu., 07 Dec. 0.0398 0.0340 0.0366
16:01-17:00, Thu., 07 Dec. 0.0403 0.0340 0.0366
15:01-16:00, Thu., 07 Dec. 0.0409 0.0346 0.0366
14:01-15:00, Thu., 07 Dec. 0.0387 0.0349 0.0367
13:01-14:00, Thu., 07 Dec. 0.0391 0.0340 0.0367
12:01-13:00, Thu., 07 Dec. 0.0402 0.0347 0.0368
11:01-12:00, Thu., 07 Dec. 0.0396 0.0347 0.0368
10:01-11:00, Thu., 07 Dec. 0.0410 0.0350 0.0371
09:01-10:00, Thu., 07 Dec. 0.0403 0.0357 0.0374
08:01-09:00, Thu., 07 Dec. 0.0419 0.0353 0.0374
07:01-08:00, Thu., 07 Dec. 0.0405 0.0358 0.0373
06:01-07:00, Thu., 07 Dec. 0.0407 0.0351 0.0375
05:01-06:00, Thu., 07 Dec. 0.0411 0.0353 0.0374
04:01-05:00, Thu., 07 Dec. 0.0395 0.0348 0.0368
03:01-04:00, Thu., 07 Dec. 0.0412 0.0346 0.0370
02:01-03:00, Thu., 07 Dec. 0.0392 0.0345 0.0364
01:01-02:00, Thu., 07 Dec. 0.0412 0.0347 0.0369
00:01-01:00, Thu., 07 Dec. 0.0391 0.0338 0.0367
23:01-24:00, Wed., 06 Dec. 0.0410 0.0347 0.0369
22:01-23:00, Wed., 06 Dec. 0.0393 0.0335 0.0368
21:01-22:00, Wed., 06 Dec. 0.0411 0.0346 0.0368
20:01-21:00, Wed., 06 Dec. 0.0415 0.0350 0.0369
19:01-20:00, Wed., 06 Dec. 0.0406 0.0352 0.0368
18:01-19:00, Wed., 06 Dec. 0.0400 0.0338 0.0367
17:01-18:00, Wed., 06 Dec. 0.0398 0.0347 0.0365
16:01-17:00, Wed., 06 Dec. 0.0406 0.0337 0.0366
15:01-16:00, Wed., 06 Dec. 0.0408 0.0345 0.0367
14:01-15:00, Wed., 06 Dec. 0.0392 0.0340 0.0366
13:01-14:00, Wed., 06 Dec. 0.0397 0.0350 0.0366
12:01-13:00, Wed., 06 Dec. 0.0383 0.0345 0.0364
11:01-12:00, Wed., 06 Dec. 0.0404 0.0343 0.0363
10:01-11:00, Wed., 06 Dec. 0.0394 0.0343 0.0366
09:01-10:00, Wed., 06 Dec. 0.0394 0.0340 0.0362
08:01-09:00, Wed., 06 Dec. 0.0400 0.0348 0.0368
07:01-08:00, Wed., 06 Dec. 0.0417 0.0342 0.0367
06:01-07:00, Wed., 06 Dec. 0.0388 0.0353 0.0367
05:01-06:00, Wed., 06 Dec. 0.0401 0.0339 0.0365
04:01-05:00, Wed., 06 Dec. 0.0394 0.0352 0.0367
03:01-04:00, Wed., 06 Dec. 0.0383 0.0347 0.0364
02:01-03:00, Wed., 06 Dec. 0.0398 0.0341 0.0363
01:01-02:00, Wed., 06 Dec. 0.0414 0.0349 0.0367
00:01-01:00, Wed., 06 Dec. 0.0414 0.0346 0.0366
23:01-24:00, Tue., 05 Dec. 0.0391 0.0335 0.0363
22:01-23:00, Tue., 05 Dec. 0.0390 0.0342 0.0363
21:01-22:00, Tue., 05 Dec. 0.0399 0.0345 0.0363
20:01-21:00, Tue., 05 Dec. 0.0396 0.0338 0.0362
19:01-20:00, Tue., 05 Dec. 0.0408 0.0346 0.0366
18:01-19:00, Tue., 05 Dec. 0.0394 0.0348 0.0366
17:01-18:00, Tue., 05 Dec. 0.0394 0.0347 0.0363
16:01-17:00, Tue., 05 Dec. 0.0388 0.0346 0.0364
15:01-16:00, Tue., 05 Dec. 0.0400 0.0338 0.0366
14:01-15:00, Tue., 05 Dec. 0.0397 0.0348 0.0365
13:01-14:00, Tue., 05 Dec. 0.0404 0.0351 0.0371
12:01-13:00, Tue., 05 Dec. 0.0398 0.0348 0.0366
11:01-12:00, Tue., 05 Dec. 0.0404 0.0333 0.0367
10:01-11:00, Tue., 05 Dec. 0.0410 0.0343 0.0369
09:01-10:00, Tue., 05 Dec. 0.0410 0.0353 0.0372
08:01-09:00, Tue., 05 Dec. 0.0405 0.0349 0.0371
07:01-08:00, Tue., 05 Dec. 0.0400 0.0351 0.0373
06:01-07:00, Tue., 05 Dec. 0.0398 0.0347 0.0371
05:01-06:00, Tue., 05 Dec. 0.0414 0.0353 0.0373
04:01-05:00, Tue., 05 Dec. 0.0408 0.0356 0.0371
03:01-04:00, Tue., 05 Dec. 0.0398 0.0351 0.0371
02:01-03:00, Tue., 05 Dec. 0.0406 0.0351 0.0372
01:01-02:00, Tue., 05 Dec. 0.0416 0.0345 0.0369
00:01-01:00, Tue., 05 Dec. 0.0385 0.0348 0.0366
23:01-24:00, Mon., 04 Dec. 0.0399 0.0331 0.0365
22:01-23:00, Mon., 04 Dec. 0.0405 0.0356 0.0374
21:01-22:00, Mon., 04 Dec. 0.0409 0.0357 0.0376
20:01-21:00, Mon., 04 Dec. 0.0428 0.0357 0.0388
19:01-20:00, Mon., 04 Dec. 0.0444 0.0364 0.0399
18:01-19:00, Mon., 04 Dec. 0.0422 0.0352 0.0380
17:01-18:00, Mon., 04 Dec. 0.0415 0.0349 0.0372
16:01-17:00, Mon., 04 Dec. 0.0403 0.0348 0.0369
15:01-16:00, Mon., 04 Dec. 0.0392 0.0348 0.0365
14:01-15:00, Mon., 04 Dec. 0.0390 0.0349 0.0366
13:01-14:00, Mon., 04 Dec. 0.0412 0.0354 0.0371
12:01-13:00, Mon., 04 Dec. 0.0409 0.0354 0.0368
11:01-12:00, Mon., 04 Dec. 0.0399 0.0352 0.0371
10:01-11:00, Mon., 04 Dec. 0.0413 0.0358 0.0376
09:01-10:00, Mon., 04 Dec. 0.0412 0.0360 0.0379
08:01-09:00, Mon., 04 Dec. 0.0412 0.0355 0.0375
07:01-08:00, Mon., 04 Dec. 0.0407 0.0362 0.0382
06:01-07:00, Mon., 04 Dec. 0.0413 0.0355 0.0379
05:01-06:00, Mon., 04 Dec. 0.0422 0.0353 0.0381
04:01-05:00, Mon., 04 Dec. 0.0407 0.0355 0.0374
03:01-04:00, Mon., 04 Dec. 0.0400 0.0354 0.0371
02:01-03:00, Mon., 04 Dec. 0.0412 0.0347 0.0370
01:01-02:00, Mon., 04 Dec. 0.0396 0.0336 0.0368
00:01-01:00, Mon., 04 Dec. 0.0447 0.0347 0.0371
23:01-24:00, Sun., 03 Dec. 0.0409 0.0349 0.0373
22:01-23:00, Sun., 03 Dec. 0.0415 0.0352 0.0370
21:01-22:00, Sun., 03 Dec. 0.0413 0.0348 0.0369
20:01-21:00, Sun., 03 Dec. 0.0397 0.0341 0.0365
19:01-20:00, Sun., 03 Dec. 0.0401 0.0349 0.0367
18:01-19:00, Sun., 03 Dec. 0.0395 0.0344 0.0366
17:01-18:00, Sun., 03 Dec. 0.0399 0.0344 0.0365
16:01-17:00, Sun., 03 Dec. 0.0400 0.0341 0.0368
15:01-16:00, Sun., 03 Dec. 0.0402 0.0348 0.0368
14:01-15:00, Sun., 03 Dec. 0.0420 0.0347 0.0367
13:01-14:00, Sun., 03 Dec. 0.0396 0.0345 0.0367
12:01-13:00, Sun., 03 Dec. 0.0406 0.0354 0.0370
11:01-12:00, Sun., 03 Dec. 0.0402 0.0352 0.0372
10:01-11:00, Sun., 03 Dec. 0.0396 0.0346 0.0370
09:01-10:00, Sun., 03 Dec. 0.0410 0.0357 0.0371
08:01-09:00, Sun., 03 Dec. 0.0423 0.0358 0.0374
07:01-08:00, Sun., 03 Dec. 0.0402 0.0357 0.0371
06:01-07:00, Sun., 03 Dec. 0.0399 0.0350 0.0371
05:01-06:00, Sun., 03 Dec. 0.0411 0.0349 0.0373
04:01-05:00, Sun., 03 Dec. 0.0427 0.0348 0.0372
03:01-04:00, Sun., 03 Dec. 0.0397 0.0348 0.0370
02:01-03:00, Sun., 03 Dec. 0.0412 0.0355 0.0370
01:01-02:00, Sun., 03 Dec. 0.0404 0.0345 0.0374
00:01-01:00, Sun., 03 Dec. 0.0399 0.0340 0.0368
23:01-24:00, Sat., 02 Dec. 0.0404 0.0346 0.0366
22:01-23:00, Sat., 02 Dec. 0.0396 0.0342 0.0362
21:01-22:00, Sat., 02 Dec. 0.0391 0.0342 0.0361
20:01-21:00, Sat., 02 Dec. 0.0394 0.0333 0.0360
19:01-20:00, Sat., 02 Dec. 0.0383 0.0344 0.0360
18:01-19:00, Sat., 02 Dec. 0.0382 0.0334 0.0361
17:01-18:00, Sat., 02 Dec. 0.0391 0.0342 0.0362
16:01-17:00, Sat., 02 Dec. 0.0389 0.0344 0.0362
15:01-16:00, Sat., 02 Dec. 0.0398 0.0343 0.0363
14:01-15:00, Sat., 02 Dec. 0.0390 0.0342 0.0363
13:01-14:00, Sat., 02 Dec. 0.0386 0.0346 0.0364
12:01-13:00, Sat., 02 Dec. 0.0390 0.0335 0.0364
11:01-12:00, Sat., 02 Dec. 0.0394 0.0344 0.0363
10:01-11:00, Sat., 02 Dec. 0.0405 0.0349 0.0366
09:01-10:00, Sat., 02 Dec. 0.0399 0.0342 0.0366
08:01-09:00, Sat., 02 Dec. 0.0397 0.0348 0.0368
07:01-08:00, Sat., 02 Dec. 0.0401 0.0353 0.0370
06:01-07:00, Sat., 02 Dec. 0.0401 0.0349 0.0369
05:01-06:00, Sat., 02 Dec. 0.0399 0.0350 0.0368
04:01-05:00, Sat., 02 Dec. 0.0396 0.0342 0.0369
03:01-04:00, Sat., 02 Dec. 0.0406 0.0341 0.0366
02:01-03:00, Sat., 02 Dec. 0.0420 0.0339 0.0367
01:01-02:00, Sat., 02 Dec. 0.0394 0.0352 0.0367
00:01-01:00, Sat., 02 Dec. 0.0399 0.0332 0.0366
23:01-24:00, Fri., 01 Dec. 0.0394 0.0334 0.0365
22:01-23:00, Fri., 01 Dec. 0.0398 0.0337 0.0363
21:01-22:00, Fri., 01 Dec. 0.0398 0.0345 0.0365
20:01-21:00, Fri., 01 Dec. 0.0390 0.0339 0.0363
19:01-20:00, Fri., 01 Dec. 0.0412 0.0348 0.0366
18:01-19:00, Fri., 01 Dec. 0.0387 0.0347 0.0365
17:01-18:00, Fri., 01 Dec. 0.0378 0.0344 0.0361
16:01-17:00, Fri., 01 Dec. 0.0398 0.0344 0.0365
15:01-16:00, Fri., 01 Dec. 0.0395 0.0346 0.0366
14:01-15:00, Fri., 01 Dec. 0.0394 0.0339 0.0363
13:01-14:00, Fri., 01 Dec. 0.0395 0.0339 0.0365
12:01-13:00, Fri., 01 Dec. 0.0390 0.0340 0.0364