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

Due to a power outage at our center due to statutory inspection of electrical equipment, we will temporarily suspend updating of monitoring post measurement values ​​from 8:00 to 19:00 on Saturday, October 18, 2025.

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
06:01-07:00, Sun., 14 Sep. 0.0373 0.0324 0.0349
05:01-06:00, Sun., 14 Sep. 0.0366 0.0329 0.0349
04:01-05:00, Sun., 14 Sep. 0.0374 0.0324 0.0347
03:01-04:00, Sun., 14 Sep. 0.0367 0.0324 0.0346
02:01-03:00, Sun., 14 Sep. 0.0370 0.0335 0.0350
01:01-02:00, Sun., 14 Sep. 0.0367 0.0332 0.0348
00:01-01:00, Sun., 14 Sep. 0.0370 0.0323 0.0351
23:01-24:00, Sat., 13 Sep. 0.0369 0.0334 0.0350
22:01-23:00, Sat., 13 Sep. 0.0372 0.0324 0.0349
21:01-22:00, Sat., 13 Sep. 0.0378 0.0336 0.0354
20:01-21:00, Sat., 13 Sep. 0.0386 0.0336 0.0359
19:01-20:00, Sat., 13 Sep. 0.0381 0.0332 0.0352
18:01-19:00, Sat., 13 Sep. 0.0373 0.0328 0.0350
17:01-18:00, Sat., 13 Sep. 0.0371 0.0329 0.0350
16:01-17:00, Sat., 13 Sep. 0.0368 0.0329 0.0349
15:01-16:00, Sat., 13 Sep. 0.0378 0.0319 0.0349
14:01-15:00, Sat., 13 Sep. 0.0378 0.0323 0.0351
13:01-14:00, Sat., 13 Sep. 0.0373 0.0326 0.0347
12:01-13:00, Sat., 13 Sep. 0.0367 0.0327 0.0348
11:01-12:00, Sat., 13 Sep. 0.0368 0.0322 0.0348
10:01-11:00, Sat., 13 Sep. 0.0379 0.0328 0.0350
09:01-10:00, Sat., 13 Sep. 0.0365 0.0331 0.0348
08:01-09:00, Sat., 13 Sep. 0.0369 0.0329 0.0349
07:01-08:00, Sat., 13 Sep. 0.0365 0.0325 0.0349
06:01-07:00, Sat., 13 Sep. 0.0370 0.0327 0.0347
05:01-06:00, Sat., 13 Sep. 0.0378 0.0334 0.0355
04:01-05:00, Sat., 13 Sep. 0.0386 0.0338 0.0362
03:01-04:00, Sat., 13 Sep. 0.0469 0.0361 0.0401
02:01-03:00, Sat., 13 Sep. 0.0470 0.0384 0.0411
01:01-02:00, Sat., 13 Sep. 0.0420 0.0356 0.0387
00:01-01:00, Sat., 13 Sep. 0.0402 0.0337 0.0362
23:01-24:00, Fri., 12 Sep. 0.0391 0.0338 0.0356
22:01-23:00, Fri., 12 Sep. 0.0393 0.0337 0.0361
21:01-22:00, Fri., 12 Sep. 0.0410 0.0339 0.0362
20:01-21:00, Fri., 12 Sep. 0.0378 0.0326 0.0353
19:01-20:00, Fri., 12 Sep. 0.0369 0.0328 0.0350
18:01-19:00, Fri., 12 Sep. 0.0360 0.0322 0.0346
17:01-18:00, Fri., 12 Sep. 0.0367 0.0323 0.0350
16:01-17:00, Fri., 12 Sep. 0.0393 0.0328 0.0353
15:01-16:00, Fri., 12 Sep. 0.0370 0.0335 0.0355
14:01-15:00, Fri., 12 Sep. 0.0388 0.0333 0.0360
13:01-14:00, Fri., 12 Sep. 0.0372 0.0325 0.0355
12:01-13:00, Fri., 12 Sep. 0.0373 0.0336 0.0354
11:01-12:00, Fri., 12 Sep. 0.0374 0.0329 0.0350
10:01-11:00, Fri., 12 Sep. 0.0369 0.0327 0.0348
09:01-10:00, Fri., 12 Sep. 0.0369 0.0329 0.0351
08:01-09:00, Fri., 12 Sep. 0.0366 0.0328 0.0349
07:01-08:00, Fri., 12 Sep. 0.0375 0.0334 0.0352
06:01-07:00, Fri., 12 Sep. 0.0373 0.0328 0.0354
05:01-06:00, Fri., 12 Sep. 0.0375 0.0330 0.0357
04:01-05:00, Fri., 12 Sep. 0.0391 0.0339 0.0366
03:01-04:00, Fri., 12 Sep. 0.0429 0.0359 0.0391
02:01-03:00, Fri., 12 Sep. 0.0386 0.0340 0.0359
01:01-02:00, Fri., 12 Sep. 0.0421 0.0338 0.0368
00:01-01:00, Fri., 12 Sep. 0.0423 0.0356 0.0386
23:01-24:00, Thu., 11 Sep. 0.0416 0.0346 0.0374
22:01-23:00, Thu., 11 Sep. 0.0367 0.0328 0.0349
21:01-22:00, Thu., 11 Sep. 0.0384 0.0330 0.0353
20:01-21:00, Thu., 11 Sep. 0.0385 0.0343 0.0361
19:01-20:00, Thu., 11 Sep. 0.0390 0.0345 0.0363
18:01-19:00, Thu., 11 Sep. 0.0381 0.0333 0.0354
17:01-18:00, Thu., 11 Sep. 0.0403 0.0334 0.0362
16:01-17:00, Thu., 11 Sep. 0.0468 0.0355 0.0407
15:01-16:00, Thu., 11 Sep. 0.0498 0.0419 0.0459
14:01-15:00, Thu., 11 Sep. 0.0471 0.0339 0.0401
13:01-14:00, Thu., 11 Sep. 0.0370 0.0324 0.0350
12:01-13:00, Thu., 11 Sep. 0.0392 0.0330 0.0353
11:01-12:00, Thu., 11 Sep. 0.0384 0.0326 0.0351
10:01-11:00, Thu., 11 Sep. 0.0367 0.0334 0.0352
09:01-10:00, Thu., 11 Sep. 0.0387 0.0330 0.0352
08:01-09:00, Thu., 11 Sep. 0.0370 0.0325 0.0349
07:01-08:00, Thu., 11 Sep. 0.0373 0.0328 0.0348
06:01-07:00, Thu., 11 Sep. 0.0370 0.0330 0.0349
05:01-06:00, Thu., 11 Sep. 0.0377 0.0324 0.0350
04:01-05:00, Thu., 11 Sep. 0.0368 0.0332 0.0348
03:01-04:00, Thu., 11 Sep. 0.0369 0.0323 0.0347
02:01-03:00, Thu., 11 Sep. 0.0369 0.0322 0.0347
01:01-02:00, Thu., 11 Sep. 0.0398 0.0324 0.0351
00:01-01:00, Thu., 11 Sep. 0.0388 0.0328 0.0348
23:01-24:00, Wed., 10 Sep. 0.0366 0.0322 0.0346
22:01-23:00, Wed., 10 Sep. 0.0389 0.0324 0.0347
21:01-22:00, Wed., 10 Sep. 0.0364 0.0324 0.0348
20:01-21:00, Wed., 10 Sep. 0.0369 0.0326 0.0348
19:01-20:00, Wed., 10 Sep. 0.0368 0.0316 0.0345
18:01-19:00, Wed., 10 Sep. 0.0371 0.0326 0.0347
17:01-18:00, Wed., 10 Sep. 0.0386 0.0331 0.0352
16:01-17:00, Wed., 10 Sep. 0.0415 0.0341 0.0362
15:01-16:00, Wed., 10 Sep. 0.0438 0.0353 0.0392
14:01-15:00, Wed., 10 Sep. 0.0465 0.0388 0.0419
13:01-14:00, Wed., 10 Sep. 0.0459 0.0344 0.0390
12:01-13:00, Wed., 10 Sep. 0.0415 0.0350 0.0373
11:01-12:00, Wed., 10 Sep. 0.0391 0.0335 0.0357
10:01-11:00, Wed., 10 Sep. 0.0387 0.0333 0.0356
09:01-10:00, Wed., 10 Sep. 0.0380 0.0339 0.0358
08:01-09:00, Wed., 10 Sep. 0.0390 0.0344 0.0361
07:01-08:00, Wed., 10 Sep. 0.0387 0.0341 0.0360
06:01-07:00, Wed., 10 Sep. 0.0393 0.0342 0.0361
05:01-06:00, Wed., 10 Sep. 0.0381 0.0337 0.0359
04:01-05:00, Wed., 10 Sep. 0.0391 0.0345 0.0360
03:01-04:00, Wed., 10 Sep. 0.0373 0.0335 0.0358
02:01-03:00, Wed., 10 Sep. 0.0379 0.0343 0.0358
01:01-02:00, Wed., 10 Sep. 0.0398 0.0331 0.0359
00:01-01:00, Wed., 10 Sep. 0.0380 0.0336 0.0358
23:01-24:00, Tue., 09 Sep. 0.0386 0.0329 0.0356
22:01-23:00, Tue., 09 Sep. 0.0380 0.0333 0.0356
21:01-22:00, Tue., 09 Sep. 0.0380 0.0335 0.0357
20:01-21:00, Tue., 09 Sep. 0.0370 0.0335 0.0357
19:01-20:00, Tue., 09 Sep. 0.0377 0.0339 0.0355
18:01-19:00, Tue., 09 Sep. 0.0384 0.0341 0.0358
17:01-18:00, Tue., 09 Sep. 0.0377 0.0332 0.0359
16:01-17:00, Tue., 09 Sep. 0.0377 0.0336 0.0357
15:01-16:00, Tue., 09 Sep. 0.0383 0.0331 0.0355
14:01-15:00, Tue., 09 Sep. 0.0370 0.0319 0.0354
13:01-14:00, Tue., 09 Sep. 0.0378 0.0325 0.0352
12:01-13:00, Tue., 09 Sep. 0.0386 0.0332 0.0355
11:01-12:00, Tue., 09 Sep. 0.0388 0.0333 0.0356
10:01-11:00, Tue., 09 Sep. 0.0376 0.0337 0.0354
09:01-10:00, Tue., 09 Sep. 0.0374 0.0333 0.0354
08:01-09:00, Tue., 09 Sep. 0.0382 0.0327 0.0354
07:01-08:00, Tue., 09 Sep. 0.0383 0.0328 0.0358
06:01-07:00, Tue., 09 Sep. 0.0378 0.0339 0.0358
05:01-06:00, Tue., 09 Sep. 0.0381 0.0337 0.0357
04:01-05:00, Tue., 09 Sep. 0.0381 0.0333 0.0356
03:01-04:00, Tue., 09 Sep. 0.0385 0.0331 0.0357
02:01-03:00, Tue., 09 Sep. 0.0377 0.0321 0.0354
01:01-02:00, Tue., 09 Sep. 0.0382 0.0336 0.0356
00:01-01:00, Tue., 09 Sep. 0.0376 0.0339 0.0356
23:01-24:00, Mon., 08 Sep. 0.0370 0.0335 0.0356
22:01-23:00, Mon., 08 Sep. 0.0376 0.0332 0.0357
21:01-22:00, Mon., 08 Sep. 0.0387 0.0338 0.0357
20:01-21:00, Mon., 08 Sep. 0.0415 0.0341 0.0368
19:01-20:00, Mon., 08 Sep. 0.0451 0.0356 0.0393
18:01-19:00, Mon., 08 Sep. 0.0436 0.0332 0.0376
17:01-18:00, Mon., 08 Sep. 0.0374 0.0334 0.0353
16:01-17:00, Mon., 08 Sep. 0.0369 0.0329 0.0354
15:01-16:00, Mon., 08 Sep. 0.0376 0.0336 0.0356
14:01-15:00, Mon., 08 Sep. 0.0372 0.0321 0.0353
13:01-14:00, Mon., 08 Sep. 0.0373 0.0337 0.0356
12:01-13:00, Mon., 08 Sep. 0.0389 0.0332 0.0352
11:01-12:00, Mon., 08 Sep. 0.0372 0.0335 0.0354
10:01-11:00, Mon., 08 Sep. 0.0376 0.0338 0.0357
09:01-10:00, Mon., 08 Sep. 0.0382 0.0331 0.0355
08:01-09:00, Mon., 08 Sep. 0.0379 0.0338 0.0360
07:01-08:00, Mon., 08 Sep. 0.0389 0.0337 0.0360
06:01-07:00, Mon., 08 Sep. 0.0389 0.0337 0.0359
05:01-06:00, Mon., 08 Sep. 0.0386 0.0329 0.0356
04:01-05:00, Mon., 08 Sep. 0.0384 0.0331 0.0355
03:01-04:00, Mon., 08 Sep. 0.0380 0.0336 0.0355
02:01-03:00, Mon., 08 Sep. 0.0403 0.0334 0.0356
01:01-02:00, Mon., 08 Sep. 0.0371 0.0340 0.0355
00:01-01:00, Mon., 08 Sep. 0.0371 0.0330 0.0355
23:01-24:00, Sun., 07 Sep. 0.0380 0.0330 0.0353
22:01-23:00, Sun., 07 Sep. 0.0372 0.0329 0.0352
21:01-22:00, Sun., 07 Sep. 0.0377 0.0340 0.0354
20:01-21:00, Sun., 07 Sep. 0.0376 0.0328 0.0352
19:01-20:00, Sun., 07 Sep. 0.0383 0.0332 0.0353
18:01-19:00, Sun., 07 Sep. 0.0390 0.0335 0.0355
17:01-18:00, Sun., 07 Sep. 0.0396 0.0332 0.0352
16:01-17:00, Sun., 07 Sep. 0.0367 0.0334 0.0353
15:01-16:00, Sun., 07 Sep. 0.0368 0.0319 0.0351
14:01-15:00, Sun., 07 Sep. 0.0376 0.0339 0.0353
13:01-14:00, Sun., 07 Sep. 0.0403 0.0334 0.0353
12:01-13:00, Sun., 07 Sep. 0.0377 0.0330 0.0354
11:01-12:00, Sun., 07 Sep. 0.0375 0.0331 0.0353
10:01-11:00, Sun., 07 Sep. 0.0369 0.0328 0.0353
09:01-10:00, Sun., 07 Sep. 0.0373 0.0323 0.0350
08:01-09:00, Sun., 07 Sep. 0.0372 0.0332 0.0353
07:01-08:00, Sun., 07 Sep. 0.0371 0.0331 0.0354
06:01-07:00, Sun., 07 Sep. 0.0370 0.0330 0.0352
05:01-06:00, Sun., 07 Sep. 0.0379 0.0336 0.0355
04:01-05:00, Sun., 07 Sep. 0.0370 0.0328 0.0351
03:01-04:00, Sun., 07 Sep. 0.0387 0.0324 0.0354
02:01-03:00, Sun., 07 Sep. 0.0384 0.0325 0.0352
01:01-02:00, Sun., 07 Sep. 0.0378 0.0326 0.0351
00:01-01:00, Sun., 07 Sep. 0.0370 0.0338 0.0354
23:01-24:00, Sat., 06 Sep. 0.0373 0.0328 0.0351
22:01-23:00, Sat., 06 Sep. 0.0372 0.0332 0.0353
21:01-22:00, Sat., 06 Sep. 0.0369 0.0337 0.0352
20:01-21:00, Sat., 06 Sep. 0.0380 0.0334 0.0352
19:01-20:00, Sat., 06 Sep. 0.0378 0.0337 0.0354
18:01-19:00, Sat., 06 Sep. 0.0371 0.0333 0.0354
17:01-18:00, Sat., 06 Sep. 0.0370 0.0333 0.0354
16:01-17:00, Sat., 06 Sep. 0.0384 0.0327 0.0350
15:01-16:00, Sat., 06 Sep. 0.0373 0.0327 0.0353
14:01-15:00, Sat., 06 Sep. 0.0384 0.0332 0.0353
13:01-14:00, Sat., 06 Sep. 0.0385 0.0331 0.0355
12:01-13:00, Sat., 06 Sep. 0.0367 0.0332 0.0351
11:01-12:00, Sat., 06 Sep. 0.0371 0.0328 0.0352
10:01-11:00, Sat., 06 Sep. 0.0371 0.0332 0.0353
09:01-10:00, Sat., 06 Sep. 0.0373 0.0321 0.0348
08:01-09:00, Sat., 06 Sep. 0.0385 0.0331 0.0354
07:01-08:00, Sat., 06 Sep. 0.0400 0.0334 0.0356
06:01-07:00, Sat., 06 Sep. 0.0370 0.0337 0.0356
05:01-06:00, Sat., 06 Sep. 0.0380 0.0328 0.0355
04:01-05:00, Sat., 06 Sep. 0.0373 0.0329 0.0353
03:01-04:00, Sat., 06 Sep. 0.0372 0.0325 0.0353
02:01-03:00, Sat., 06 Sep. 0.0373 0.0331 0.0351
01:01-02:00, Sat., 06 Sep. 0.0372 0.0328 0.0353
00:01-01:00, Sat., 06 Sep. 0.0380 0.0338 0.0353
23:01-24:00, Fri., 05 Sep. 0.0369 0.0325 0.0351
22:01-23:00, Fri., 05 Sep. 0.0373 0.0332 0.0354
21:01-22:00, Fri., 05 Sep. 0.0372 0.0327 0.0350
20:01-21:00, Fri., 05 Sep. 0.0369 0.0326 0.0351
19:01-20:00, Fri., 05 Sep. 0.0370 0.0325 0.0352
18:01-19:00, Fri., 05 Sep. 0.0369 0.0334 0.0350
17:01-18:00, Fri., 05 Sep. 0.0379 0.0335 0.0359
16:01-17:00, Fri., 05 Sep. 0.0440 0.0346 0.0391
15:01-16:00, Fri., 05 Sep. 0.0439 0.0364 0.0411
14:01-15:00, Fri., 05 Sep. 0.0439 0.0387 0.0411
13:01-14:00, Fri., 05 Sep. 0.0447 0.0352 0.0383
12:01-13:00, Fri., 05 Sep. 0.0393 0.0339 0.0360
11:01-12:00, Fri., 05 Sep. 0.0376 0.0335 0.0357
10:01-11:00, Fri., 05 Sep. 0.0373 0.0330 0.0356
09:01-10:00, Fri., 05 Sep. 0.0382 0.0342 0.0359
08:01-09:00, Fri., 05 Sep. 0.0392 0.0335 0.0357
07:01-08:00, Fri., 05 Sep. 0.0403 0.0339 0.0356
06:01-07:00, Fri., 05 Sep. 0.0375 0.0330 0.0356
05:01-06:00, Fri., 05 Sep. 0.0375 0.0337 0.0357
04:01-05:00, Fri., 05 Sep. 0.0374 0.0334 0.0355
03:01-04:00, Fri., 05 Sep. 0.0394 0.0339 0.0358
02:01-03:00, Fri., 05 Sep. 0.0388 0.0332 0.0356
01:01-02:00, Fri., 05 Sep. 0.0389 0.0330 0.0358
00:01-01:00, Fri., 05 Sep. 0.0378 0.0330 0.0358
23:01-24:00, Thu., 04 Sep. 0.0390 0.0342 0.0362
22:01-23:00, Thu., 04 Sep. 0.0397 0.0347 0.0365
21:01-22:00, Thu., 04 Sep. 0.0392 0.0342 0.0362
20:01-21:00, Thu., 04 Sep. 0.0377 0.0345 0.0361
19:01-20:00, Thu., 04 Sep. 0.0389 0.0340 0.0362
18:01-19:00, Thu., 04 Sep. 0.0401 0.0337 0.0363
17:01-18:00, Thu., 04 Sep. 0.0386 0.0346 0.0363
16:01-17:00, Thu., 04 Sep. 0.0384 0.0339 0.0361
15:01-16:00, Thu., 04 Sep. 0.0389 0.0341 0.0363
14:01-15:00, Thu., 04 Sep. 0.0391 0.0344 0.0364
13:01-14:00, Thu., 04 Sep. 0.0403 0.0340 0.0369
12:01-13:00, Thu., 04 Sep. 0.0430 0.0351 0.0378
11:01-12:00, Thu., 04 Sep. 0.0409 0.0343 0.0363
10:01-11:00, Thu., 04 Sep. 0.0392 0.0342 0.0361
09:01-10:00, Thu., 04 Sep. 0.0400 0.0344 0.0362
08:01-09:00, Thu., 04 Sep. 0.0386 0.0342 0.0361
07:01-08:00, Thu., 04 Sep. 0.0389 0.0341 0.0360