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.

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
07:01-08:00, Wed., 05 Nov. 0.0391 0.0345 0.0363
06:01-07:00, Wed., 05 Nov. 0.0389 0.0335 0.0360
05:01-06:00, Wed., 05 Nov. 0.0377 0.0332 0.0359
04:01-05:00, Wed., 05 Nov. 0.0383 0.0335 0.0357
03:01-04:00, Wed., 05 Nov. 0.0370 0.0341 0.0356
02:01-03:00, Wed., 05 Nov. 0.0388 0.0325 0.0358
01:01-02:00, Wed., 05 Nov. 0.0385 0.0340 0.0359
00:01-01:00, Wed., 05 Nov. 0.0391 0.0337 0.0356
23:01-24:00, Tue., 04 Nov. 0.0373 0.0330 0.0352
22:01-23:00, Tue., 04 Nov. 0.0371 0.0327 0.0350
21:01-22:00, Tue., 04 Nov. 0.0390 0.0316 0.0350
20:01-21:00, Tue., 04 Nov. 0.0377 0.0325 0.0352
19:01-20:00, Tue., 04 Nov. 0.0368 0.0327 0.0349
18:01-19:00, Tue., 04 Nov. 0.0379 0.0331 0.0352
17:01-18:00, Tue., 04 Nov. 0.0375 0.0328 0.0350
16:01-17:00, Tue., 04 Nov. 0.0369 0.0324 0.0350
15:01-16:00, Tue., 04 Nov. 0.0372 0.0328 0.0352
14:01-15:00, Tue., 04 Nov. 0.0375 0.0332 0.0352
13:01-14:00, Tue., 04 Nov. 0.0379 0.0337 0.0355
12:01-13:00, Tue., 04 Nov. 0.0373 0.0332 0.0352
11:01-12:00, Tue., 04 Nov. 0.0372 0.0334 0.0353
10:01-11:00, Tue., 04 Nov. 0.0374 0.0332 0.0354
09:01-10:00, Tue., 04 Nov. 0.0372 0.0331 0.0353
08:01-09:00, Tue., 04 Nov. 0.0374 0.0330 0.0355
07:01-08:00, Tue., 04 Nov. 0.0380 0.0328 0.0355
06:01-07:00, Tue., 04 Nov. 0.0370 0.0332 0.0352
05:01-06:00, Tue., 04 Nov. 0.0376 0.0335 0.0355
04:01-05:00, Tue., 04 Nov. 0.0382 0.0329 0.0354
03:01-04:00, Tue., 04 Nov. 0.0372 0.0335 0.0353
02:01-03:00, Tue., 04 Nov. 0.0371 0.0327 0.0354
01:01-02:00, Tue., 04 Nov. 0.0377 0.0329 0.0353
00:01-01:00, Tue., 04 Nov. 0.0369 0.0331 0.0352
23:01-24:00, Mon., 03 Nov. 0.0385 0.0329 0.0353
22:01-23:00, Mon., 03 Nov. 0.0391 0.0334 0.0355
21:01-22:00, Mon., 03 Nov. 0.0375 0.0328 0.0351
20:01-21:00, Mon., 03 Nov. 0.0372 0.0336 0.0354
19:01-20:00, Mon., 03 Nov. 0.0372 0.0333 0.0354
18:01-19:00, Mon., 03 Nov. 0.0379 0.0329 0.0355
17:01-18:00, Mon., 03 Nov. 0.0403 0.0336 0.0355
16:01-17:00, Mon., 03 Nov. 0.0376 0.0339 0.0357
15:01-16:00, Mon., 03 Nov. 0.0384 0.0334 0.0357
14:01-15:00, Mon., 03 Nov. 0.0371 0.0336 0.0356
13:01-14:00, Mon., 03 Nov. 0.0384 0.0340 0.0357
12:01-13:00, Mon., 03 Nov. 0.0379 0.0329 0.0357
11:01-12:00, Mon., 03 Nov. 0.0376 0.0340 0.0359
10:01-11:00, Mon., 03 Nov. 0.0380 0.0342 0.0361
09:01-10:00, Mon., 03 Nov. 0.0405 0.0341 0.0364
08:01-09:00, Mon., 03 Nov. 0.0395 0.0346 0.0365
07:01-08:00, Mon., 03 Nov. 0.0387 0.0339 0.0362
06:01-07:00, Mon., 03 Nov. 0.0400 0.0342 0.0365
05:01-06:00, Mon., 03 Nov. 0.0389 0.0341 0.0362
04:01-05:00, Mon., 03 Nov. 0.0403 0.0330 0.0362
03:01-04:00, Mon., 03 Nov. 0.0391 0.0337 0.0362
02:01-03:00, Mon., 03 Nov. 0.0399 0.0343 0.0362
01:01-02:00, Mon., 03 Nov. 0.0387 0.0337 0.0362
00:01-01:00, Mon., 03 Nov. 0.0395 0.0341 0.0364
23:01-24:00, Sun., 02 Nov. 0.0384 0.0339 0.0357
22:01-23:00, Sun., 02 Nov. 0.0373 0.0336 0.0358
21:01-22:00, Sun., 02 Nov. 0.0382 0.0337 0.0358
20:01-21:00, Sun., 02 Nov. 0.0372 0.0340 0.0357
19:01-20:00, Sun., 02 Nov. 0.0387 0.0343 0.0359
18:01-19:00, Sun., 02 Nov. 0.0382 0.0335 0.0356
17:01-18:00, Sun., 02 Nov. 0.0390 0.0334 0.0359
16:01-17:00, Sun., 02 Nov. 0.0382 0.0336 0.0357
15:01-16:00, Sun., 02 Nov. 0.0384 0.0331 0.0359
14:01-15:00, Sun., 02 Nov. 0.0384 0.0335 0.0357
13:01-14:00, Sun., 02 Nov. 0.0389 0.0325 0.0359
12:01-13:00, Sun., 02 Nov. 0.0385 0.0341 0.0360
11:01-12:00, Sun., 02 Nov. 0.0392 0.0337 0.0361
10:01-11:00, Sun., 02 Nov. 0.0394 0.0341 0.0363
09:01-10:00, Sun., 02 Nov. 0.0396 0.0338 0.0364
08:01-09:00, Sun., 02 Nov. 0.0390 0.0334 0.0361
07:01-08:00, Sun., 02 Nov. 0.0393 0.0341 0.0363
06:01-07:00, Sun., 02 Nov. 0.0380 0.0343 0.0359
05:01-06:00, Sun., 02 Nov. 0.0382 0.0338 0.0362
04:01-05:00, Sun., 02 Nov. 0.0382 0.0332 0.0360
03:01-04:00, Sun., 02 Nov. 0.0391 0.0344 0.0362
02:01-03:00, Sun., 02 Nov. 0.0393 0.0338 0.0359
01:01-02:00, Sun., 02 Nov. 0.0401 0.0339 0.0360
00:01-01:00, Sun., 02 Nov. 0.0391 0.0332 0.0354
23:01-24:00, Sat., 01 Nov. 0.0376 0.0333 0.0353
22:01-23:00, Sat., 01 Nov. 0.0374 0.0329 0.0356
21:01-22:00, Sat., 01 Nov. 0.0398 0.0335 0.0359
20:01-21:00, Sat., 01 Nov. 0.0372 0.0334 0.0356
19:01-20:00, Sat., 01 Nov. 0.0386 0.0333 0.0355
18:01-19:00, Sat., 01 Nov. 0.0386 0.0332 0.0355
17:01-18:00, Sat., 01 Nov. 0.0389 0.0333 0.0353
16:01-17:00, Sat., 01 Nov. 0.0385 0.0317 0.0355
15:01-16:00, Sat., 01 Nov. 0.0404 0.0338 0.0357
14:01-15:00, Sat., 01 Nov. 0.0389 0.0340 0.0357
13:01-14:00, Sat., 01 Nov. 0.0381 0.0326 0.0357
12:01-13:00, Sat., 01 Nov. 0.0377 0.0335 0.0356
11:01-12:00, Sat., 01 Nov. 0.0373 0.0334 0.0356
10:01-11:00, Sat., 01 Nov. 0.0373 0.0332 0.0357
09:01-10:00, Sat., 01 Nov. 0.0371 0.0330 0.0355
08:01-09:00, Sat., 01 Nov. 0.0390 0.0339 0.0359
07:01-08:00, Sat., 01 Nov. 0.0383 0.0337 0.0356
06:01-07:00, Sat., 01 Nov. 0.0375 0.0327 0.0352
05:01-06:00, Sat., 01 Nov. 0.0370 0.0327 0.0352
04:01-05:00, Sat., 01 Nov. 0.0371 0.0333 0.0356
03:01-04:00, Sat., 01 Nov. 0.0374 0.0332 0.0357
02:01-03:00, Sat., 01 Nov. 0.0384 0.0347 0.0362
01:01-02:00, Sat., 01 Nov. 0.0390 0.0351 0.0369
00:01-01:00, Sat., 01 Nov. 0.0459 0.0360 0.0399
23:01-24:00, Fri., 31 Oct. 0.0532 0.0403 0.0467
22:01-23:00, Fri., 31 Oct. 0.0545 0.0466 0.0509
21:01-22:00, Fri., 31 Oct. 0.0557 0.0468 0.0505
20:01-21:00, Fri., 31 Oct. 0.0526 0.0445 0.0484
19:01-20:00, Fri., 31 Oct. 0.0490 0.0389 0.0453
18:01-19:00, Fri., 31 Oct. 0.0472 0.0389 0.0435
17:01-18:00, Fri., 31 Oct. 0.0463 0.0387 0.0428
16:01-17:00, Fri., 31 Oct. 0.0436 0.0362 0.0400
15:01-16:00, Fri., 31 Oct. 0.0377 0.0345 0.0360
14:01-15:00, Fri., 31 Oct. 0.0369 0.0334 0.0359
13:01-14:00, Fri., 31 Oct. 0.0378 0.0337 0.0358
12:01-13:00, Fri., 31 Oct. 0.0394 0.0338 0.0361
11:01-12:00, Fri., 31 Oct. 0.0382 0.0341 0.0363
10:01-11:00, Fri., 31 Oct. 0.0388 0.0333 0.0361
09:01-10:00, Fri., 31 Oct. 0.0383 0.0339 0.0360
08:01-09:00, Fri., 31 Oct. 0.0386 0.0343 0.0362
07:01-08:00, Fri., 31 Oct. 0.0382 0.0342 0.0360
06:01-07:00, Fri., 31 Oct. 0.0386 0.0332 0.0359
05:01-06:00, Fri., 31 Oct. 0.0387 0.0342 0.0362
04:01-05:00, Fri., 31 Oct. 0.0392 0.0344 0.0360
03:01-04:00, Fri., 31 Oct. 0.0393 0.0334 0.0358
02:01-03:00, Fri., 31 Oct. 0.0382 0.0333 0.0360
01:01-02:00, Fri., 31 Oct. 0.0374 0.0330 0.0358
00:01-01:00, Fri., 31 Oct. 0.0388 0.0341 0.0360
23:01-24:00, Thu., 30 Oct. 0.0395 0.0336 0.0357
22:01-23:00, Thu., 30 Oct. 0.0369 0.0327 0.0350
21:01-22:00, Thu., 30 Oct. 0.0376 0.0337 0.0357
20:01-21:00, Thu., 30 Oct. 0.0373 0.0336 0.0352
19:01-20:00, Thu., 30 Oct. 0.0386 0.0329 0.0353
18:01-19:00, Thu., 30 Oct. 0.0407 0.0332 0.0355
17:01-18:00, Thu., 30 Oct. 0.0377 0.0329 0.0353
16:01-17:00, Thu., 30 Oct. 0.0384 0.0332 0.0356
15:01-16:00, Thu., 30 Oct. 0.0377 0.0330 0.0353
14:01-15:00, Thu., 30 Oct. 0.0382 0.0339 0.0354
13:01-14:00, Thu., 30 Oct. 0.0397 0.0332 0.0355
12:01-13:00, Thu., 30 Oct. 0.0373 0.0330 0.0357
11:01-12:00, Thu., 30 Oct. 0.0385 0.0330 0.0356
10:01-11:00, Thu., 30 Oct. 0.0375 0.0327 0.0354
09:01-10:00, Thu., 30 Oct. 0.0385 0.0341 0.0356
08:01-09:00, Thu., 30 Oct. 0.0370 0.0339 0.0356
07:01-08:00, Thu., 30 Oct. 0.0390 0.0338 0.0358
06:01-07:00, Thu., 30 Oct. 0.0385 0.0330 0.0356
05:01-06:00, Thu., 30 Oct. 0.0374 0.0331 0.0355
04:01-05:00, Thu., 30 Oct. 0.0389 0.0337 0.0356
03:01-04:00, Thu., 30 Oct. 0.0400 0.0334 0.0355
02:01-03:00, Thu., 30 Oct. 0.0369 0.0331 0.0353
01:01-02:00, Thu., 30 Oct. 0.0372 0.0331 0.0353
00:01-01:00, Thu., 30 Oct. 0.0375 0.0337 0.0354
23:01-24:00, Wed., 29 Oct. 0.0370 0.0337 0.0353
22:01-23:00, Wed., 29 Oct. 0.0392 0.0329 0.0353
21:01-22:00, Wed., 29 Oct. 0.0380 0.0334 0.0353
20:01-21:00, Wed., 29 Oct. 0.0389 0.0326 0.0353
19:01-20:00, Wed., 29 Oct. 0.0371 0.0332 0.0352
18:01-19:00, Wed., 29 Oct. 0.0372 0.0330 0.0352
17:01-18:00, Wed., 29 Oct. 0.0372 0.0335 0.0354
16:01-17:00, Wed., 29 Oct. 0.0367 0.0327 0.0350
15:01-16:00, Wed., 29 Oct. 0.0374 0.0333 0.0354
14:01-15:00, Wed., 29 Oct. 0.0385 0.0338 0.0356
13:01-14:00, Wed., 29 Oct. 0.0381 0.0333 0.0355
12:01-13:00, Wed., 29 Oct. 0.0376 0.0334 0.0356
11:01-12:00, Wed., 29 Oct. 0.0371 0.0331 0.0352
10:01-11:00, Wed., 29 Oct. 0.0377 0.0338 0.0357
09:01-10:00, Wed., 29 Oct. 0.0382 0.0333 0.0357
08:01-09:00, Wed., 29 Oct. 0.0394 0.0331 0.0354
07:01-08:00, Wed., 29 Oct. 0.0370 0.0333 0.0355
06:01-07:00, Wed., 29 Oct. 0.0370 0.0335 0.0353
05:01-06:00, Wed., 29 Oct. 0.0376 0.0332 0.0354
04:01-05:00, Wed., 29 Oct. 0.0381 0.0336 0.0355
03:01-04:00, Wed., 29 Oct. 0.0383 0.0337 0.0353
02:01-03:00, Wed., 29 Oct. 0.0383 0.0339 0.0354
01:01-02:00, Wed., 29 Oct. 0.0366 0.0335 0.0352
00:01-01:00, Wed., 29 Oct. 0.0370 0.0333 0.0352
23:01-24:00, Tue., 28 Oct. 0.0369 0.0331 0.0351
22:01-23:00, Tue., 28 Oct. 0.0367 0.0324 0.0351
21:01-22:00, Tue., 28 Oct. 0.0375 0.0322 0.0352
20:01-21:00, Tue., 28 Oct. 0.0374 0.0330 0.0353
19:01-20:00, Tue., 28 Oct. 0.0372 0.0332 0.0353
18:01-19:00, Tue., 28 Oct. 0.0372 0.0333 0.0355
17:01-18:00, Tue., 28 Oct. 0.0375 0.0332 0.0354
16:01-17:00, Tue., 28 Oct. 0.0379 0.0334 0.0354
15:01-16:00, Tue., 28 Oct. 0.0376 0.0331 0.0355
14:01-15:00, Tue., 28 Oct. 0.0375 0.0330 0.0354
13:01-14:00, Tue., 28 Oct. 0.0396 0.0330 0.0355
12:01-13:00, Tue., 28 Oct. 0.0373 0.0332 0.0353
11:01-12:00, Tue., 28 Oct. 0.0374 0.0318 0.0356
10:01-11:00, Tue., 28 Oct. 0.0367 0.0338 0.0354
09:01-10:00, Tue., 28 Oct. 0.0373 0.0336 0.0355
08:01-09:00, Tue., 28 Oct. 0.0370 0.0330 0.0354
07:01-08:00, Tue., 28 Oct. 0.0381 0.0338 0.0355
06:01-07:00, Tue., 28 Oct. 0.0377 0.0335 0.0355
05:01-06:00, Tue., 28 Oct. 0.0377 0.0329 0.0357
04:01-05:00, Tue., 28 Oct. 0.0377 0.0337 0.0356
03:01-04:00, Tue., 28 Oct. 0.0384 0.0335 0.0356
02:01-03:00, Tue., 28 Oct. 0.0401 0.0337 0.0357
01:01-02:00, Tue., 28 Oct. 0.0373 0.0334 0.0357
00:01-01:00, Tue., 28 Oct. 0.0389 0.0330 0.0359
23:01-24:00, Mon., 27 Oct. 0.0379 0.0339 0.0356
22:01-23:00, Mon., 27 Oct. 0.0373 0.0333 0.0356
21:01-22:00, Mon., 27 Oct. 0.0389 0.0331 0.0356
20:01-21:00, Mon., 27 Oct. 0.0382 0.0336 0.0355
19:01-20:00, Mon., 27 Oct. 0.0369 0.0329 0.0354
18:01-19:00, Mon., 27 Oct. 0.0372 0.0326 0.0354
17:01-18:00, Mon., 27 Oct. 0.0374 0.0328 0.0352
16:01-17:00, Mon., 27 Oct. 0.0372 0.0339 0.0356
15:01-16:00, Mon., 27 Oct. 0.0379 0.0330 0.0351
14:01-15:00, Mon., 27 Oct. 0.0380 0.0328 0.0353
13:01-14:00, Mon., 27 Oct. 0.0376 0.0332 0.0353
12:01-13:00, Mon., 27 Oct. 0.0374 0.0330 0.0352
11:01-12:00, Mon., 27 Oct. 0.0374 0.0330 0.0350
10:01-11:00, Mon., 27 Oct. 0.0368 0.0325 0.0348
09:01-10:00, Mon., 27 Oct. 0.0366 0.0333 0.0351
08:01-09:00, Mon., 27 Oct. 0.0376 0.0330 0.0353
07:01-08:00, Mon., 27 Oct. 0.0373 0.0334 0.0354
06:01-07:00, Mon., 27 Oct. 0.0372 0.0331 0.0356
05:01-06:00, Mon., 27 Oct. 0.0389 0.0337 0.0358
04:01-05:00, Mon., 27 Oct. 0.0388 0.0337 0.0357
03:01-04:00, Mon., 27 Oct. 0.0381 0.0338 0.0355
02:01-03:00, Mon., 27 Oct. 0.0374 0.0337 0.0355
01:01-02:00, Mon., 27 Oct. 0.0374 0.0338 0.0355
00:01-01:00, Mon., 27 Oct. 0.0381 0.0328 0.0351
23:01-24:00, Sun., 26 Oct. 0.0393 0.0334 0.0356
22:01-23:00, Sun., 26 Oct. 0.0372 0.0332 0.0355
21:01-22:00, Sun., 26 Oct. 0.0402 0.0332 0.0362
20:01-21:00, Sun., 26 Oct. 0.0408 0.0346 0.0377
19:01-20:00, Sun., 26 Oct. 0.0423 0.0359 0.0382
18:01-19:00, Sun., 26 Oct. 0.0402 0.0345 0.0364
17:01-18:00, Sun., 26 Oct. 0.0393 0.0342 0.0365
16:01-17:00, Sun., 26 Oct. 0.0434 0.0358 0.0385
15:01-16:00, Sun., 26 Oct. 0.0409 0.0350 0.0372
14:01-15:00, Sun., 26 Oct. 0.0393 0.0335 0.0358
13:01-14:00, Sun., 26 Oct. 0.0375 0.0330 0.0356
12:01-13:00, Sun., 26 Oct. 0.0389 0.0343 0.0361
11:01-12:00, Sun., 26 Oct. 0.0421 0.0350 0.0380
10:01-11:00, Sun., 26 Oct. 0.0472 0.0369 0.0412
09:01-10:00, Sun., 26 Oct. 0.0495 0.0394 0.0440
08:01-09:00, Sun., 26 Oct. 0.0479 0.0385 0.0433