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
22:01-23:00, Sat., 29 Mar. 0.0395 0.0335 0.0353
21:01-22:00, Sat., 29 Mar. 0.0376 0.0324 0.0351
20:01-21:00, Sat., 29 Mar. 0.0376 0.0325 0.0354
19:01-20:00, Sat., 29 Mar. 0.0413 0.0348 0.0368
18:01-19:00, Sat., 29 Mar. 0.0439 0.0364 0.0393
17:01-18:00, Sat., 29 Mar. 0.0458 0.0366 0.0413
16:01-17:00, Sat., 29 Mar. 0.0449 0.0383 0.0413
15:01-16:00, Sat., 29 Mar. 0.0438 0.0364 0.0398
14:01-15:00, Sat., 29 Mar. 0.0480 0.0390 0.0434
13:01-14:00, Sat., 29 Mar. 0.0524 0.0430 0.0477
12:01-13:00, Sat., 29 Mar. 0.0559 0.0463 0.0507
11:01-12:00, Sat., 29 Mar. 0.0561 0.0497 0.0527
10:01-11:00, Sat., 29 Mar. 0.0588 0.0494 0.0541
09:01-10:00, Sat., 29 Mar. 0.0537 0.0426 0.0484
08:01-09:00, Sat., 29 Mar. 0.0571 0.0473 0.0525
07:01-08:00, Sat., 29 Mar. 0.0549 0.0457 0.0499
06:01-07:00, Sat., 29 Mar. 0.0511 0.0427 0.0467
05:01-06:00, Sat., 29 Mar. 0.0474 0.0410 0.0442
04:01-05:00, Sat., 29 Mar. 0.0472 0.0389 0.0429
03:01-04:00, Sat., 29 Mar. 0.0461 0.0352 0.0403
02:01-03:00, Sat., 29 Mar. 0.0377 0.0335 0.0359
01:01-02:00, Sat., 29 Mar. 0.0372 0.0334 0.0360
00:01-01:00, Sat., 29 Mar. 0.0390 0.0338 0.0364
23:01-24:00, Fri., 28 Mar. 0.0388 0.0342 0.0363
22:01-23:00, Fri., 28 Mar. 0.0395 0.0347 0.0366
21:01-22:00, Fri., 28 Mar. 0.0394 0.0348 0.0366
20:01-21:00, Fri., 28 Mar. 0.0400 0.0345 0.0365
19:01-20:00, Fri., 28 Mar. 0.0400 0.0350 0.0365
18:01-19:00, Fri., 28 Mar. 0.0380 0.0340 0.0360
17:01-18:00, Fri., 28 Mar. 0.0382 0.0334 0.0361
16:01-17:00, Fri., 28 Mar. 0.0393 0.0333 0.0357
15:01-16:00, Fri., 28 Mar. 0.0378 0.0338 0.0357
14:01-15:00, Fri., 28 Mar. 0.0377 0.0334 0.0356
13:01-14:00, Fri., 28 Mar. 0.0399 0.0336 0.0361
12:01-13:00, Fri., 28 Mar. 0.0384 0.0338 0.0358
11:01-12:00, Fri., 28 Mar. 0.0395 0.0337 0.0360
10:01-11:00, Fri., 28 Mar. 0.0405 0.0352 0.0376
09:01-10:00, Fri., 28 Mar. 0.0471 0.0367 0.0417
08:01-09:00, Fri., 28 Mar. 0.0559 0.0439 0.0506
07:01-08:00, Fri., 28 Mar. 0.0510 0.0413 0.0467
06:01-07:00, Fri., 28 Mar. 0.0442 0.0334 0.0385
05:01-06:00, Fri., 28 Mar. 0.0383 0.0340 0.0360
04:01-05:00, Fri., 28 Mar. 0.0412 0.0343 0.0361
03:01-04:00, Fri., 28 Mar. 0.0396 0.0348 0.0364
02:01-03:00, Fri., 28 Mar. 0.0385 0.0331 0.0358
01:01-02:00, Fri., 28 Mar. 0.0383 0.0338 0.0360
00:01-01:00, Fri., 28 Mar. 0.0376 0.0338 0.0357
23:01-24:00, Thu., 27 Mar. 0.0386 0.0342 0.0359
22:01-23:00, Thu., 27 Mar. 0.0384 0.0343 0.0358
21:01-22:00, Thu., 27 Mar. 0.0392 0.0339 0.0359
20:01-21:00, Thu., 27 Mar. 0.0386 0.0339 0.0359
19:01-20:00, Thu., 27 Mar. 0.0385 0.0335 0.0358
18:01-19:00, Thu., 27 Mar. 0.0417 0.0336 0.0362
17:01-18:00, Thu., 27 Mar. 0.0401 0.0346 0.0362
16:01-17:00, Thu., 27 Mar. 0.0399 0.0340 0.0363
15:01-16:00, Thu., 27 Mar. 0.0388 0.0341 0.0361
14:01-15:00, Thu., 27 Mar. 0.0397 0.0344 0.0365
13:01-14:00, Thu., 27 Mar. 0.0386 0.0341 0.0363
12:01-13:00, Thu., 27 Mar. 0.0390 0.0344 0.0362
11:01-12:00, Thu., 27 Mar. 0.0397 0.0345 0.0364
10:01-11:00, Thu., 27 Mar. 0.0392 0.0333 0.0362
09:01-10:00, Thu., 27 Mar. 0.0387 0.0336 0.0362
08:01-09:00, Thu., 27 Mar. 0.0397 0.0335 0.0361
07:01-08:00, Thu., 27 Mar. 0.0388 0.0345 0.0360
06:01-07:00, Thu., 27 Mar. 0.0408 0.0344 0.0362
05:01-06:00, Thu., 27 Mar. 0.0388 0.0348 0.0363
04:01-05:00, Thu., 27 Mar. 0.0382 0.0339 0.0359
03:01-04:00, Thu., 27 Mar. 0.0386 0.0341 0.0362
02:01-03:00, Thu., 27 Mar. 0.0390 0.0343 0.0363
01:01-02:00, Thu., 27 Mar. 0.0402 0.0341 0.0363
00:01-01:00, Thu., 27 Mar. 0.0389 0.0344 0.0362
23:01-24:00, Wed., 26 Mar. 0.0387 0.0343 0.0360
22:01-23:00, Wed., 26 Mar. 0.0398 0.0345 0.0365
21:01-22:00, Wed., 26 Mar. 0.0408 0.0340 0.0365
20:01-21:00, Wed., 26 Mar. 0.0410 0.0338 0.0362
19:01-20:00, Wed., 26 Mar. 0.0393 0.0344 0.0363
18:01-19:00, Wed., 26 Mar. 0.0404 0.0341 0.0362
17:01-18:00, Wed., 26 Mar. 0.0388 0.0343 0.0365
16:01-17:00, Wed., 26 Mar. 0.0392 0.0347 0.0365
15:01-16:00, Wed., 26 Mar. 0.0397 0.0342 0.0363
14:01-15:00, Wed., 26 Mar. 0.0398 0.0346 0.0362
13:01-14:00, Wed., 26 Mar. 0.0397 0.0333 0.0364
12:01-13:00, Wed., 26 Mar. 0.0402 0.0340 0.0365
11:01-12:00, Wed., 26 Mar. 0.0395 0.0341 0.0363
10:01-11:00, Wed., 26 Mar. 0.0384 0.0345 0.0363
09:01-10:00, Wed., 26 Mar. 0.0386 0.0339 0.0363
08:01-09:00, Wed., 26 Mar. 0.0395 0.0343 0.0366
07:01-08:00, Wed., 26 Mar. 0.0409 0.0342 0.0363
06:01-07:00, Wed., 26 Mar. 0.0391 0.0344 0.0363
05:01-06:00, Wed., 26 Mar. 0.0382 0.0338 0.0361
04:01-05:00, Wed., 26 Mar. 0.0383 0.0340 0.0359
03:01-04:00, Wed., 26 Mar. 0.0388 0.0339 0.0361
02:01-03:00, Wed., 26 Mar. 0.0392 0.0342 0.0362
01:01-02:00, Wed., 26 Mar. 0.0388 0.0341 0.0359
00:01-01:00, Wed., 26 Mar. 0.0413 0.0341 0.0361
23:01-24:00, Tue., 25 Mar. 0.0399 0.0336 0.0362
22:01-23:00, Tue., 25 Mar. 0.0395 0.0334 0.0361
21:01-22:00, Tue., 25 Mar. 0.0393 0.0342 0.0364
20:01-21:00, Tue., 25 Mar. 0.0403 0.0348 0.0363
19:01-20:00, Tue., 25 Mar. 0.0387 0.0341 0.0363
18:01-19:00, Tue., 25 Mar. 0.0409 0.0342 0.0366
17:01-18:00, Tue., 25 Mar. 0.0389 0.0340 0.0362
16:01-17:00, Tue., 25 Mar. 0.0398 0.0346 0.0365
15:01-16:00, Tue., 25 Mar. 0.0401 0.0341 0.0363
14:01-15:00, Tue., 25 Mar. 0.0390 0.0346 0.0364
13:01-14:00, Tue., 25 Mar. 0.0395 0.0341 0.0361
12:01-13:00, Tue., 25 Mar. 0.0389 0.0338 0.0362
11:01-12:00, Tue., 25 Mar. 0.0405 0.0342 0.0365
10:01-11:00, Tue., 25 Mar. 0.0383 0.0337 0.0363
09:01-10:00, Tue., 25 Mar. 0.0393 0.0350 0.0366
08:01-09:00, Tue., 25 Mar. 0.0374 0.0341 0.0359
07:01-08:00, Tue., 25 Mar. 0.0382 0.0342 0.0361
06:01-07:00, Tue., 25 Mar. 0.0392 0.0338 0.0362
05:01-06:00, Tue., 25 Mar. 0.0384 0.0337 0.0363
04:01-05:00, Tue., 25 Mar. 0.0389 0.0344 0.0363
03:01-04:00, Tue., 25 Mar. 0.0409 0.0342 0.0361
02:01-03:00, Tue., 25 Mar. 0.0390 0.0339 0.0360
01:01-02:00, Tue., 25 Mar. 0.0378 0.0340 0.0359
00:01-01:00, Tue., 25 Mar. 0.0390 0.0341 0.0363
23:01-24:00, Mon., 24 Mar. 0.0380 0.0342 0.0361
22:01-23:00, Mon., 24 Mar. 0.0387 0.0338 0.0362
21:01-22:00, Mon., 24 Mar. 0.0376 0.0340 0.0359
20:01-21:00, Mon., 24 Mar. 0.0386 0.0335 0.0360
19:01-20:00, Mon., 24 Mar. 0.0380 0.0337 0.0360
18:01-19:00, Mon., 24 Mar. 0.0390 0.0341 0.0360
17:01-18:00, Mon., 24 Mar. 0.0382 0.0344 0.0361
16:01-17:00, Mon., 24 Mar. 0.0401 0.0338 0.0360
15:01-16:00, Mon., 24 Mar. 0.0413 0.0336 0.0361
14:01-15:00, Mon., 24 Mar. 0.0387 0.0339 0.0361
13:01-14:00, Mon., 24 Mar. 0.0385 0.0341 0.0360
12:01-13:00, Mon., 24 Mar. 0.0388 0.0348 0.0361
11:01-12:00, Mon., 24 Mar. 0.0381 0.0340 0.0360
10:01-11:00, Mon., 24 Mar. 0.0407 0.0335 0.0363
09:01-10:00, Mon., 24 Mar. 0.0382 0.0339 0.0360
08:01-09:00, Mon., 24 Mar. 0.0383 0.0340 0.0361
07:01-08:00, Mon., 24 Mar. 0.0394 0.0340 0.0360
06:01-07:00, Mon., 24 Mar. 0.0394 0.0337 0.0361
05:01-06:00, Mon., 24 Mar. 0.0403 0.0334 0.0362
04:01-05:00, Mon., 24 Mar. 0.0374 0.0337 0.0358
03:01-04:00, Mon., 24 Mar. 0.0384 0.0336 0.0358
02:01-03:00, Mon., 24 Mar. 0.0407 0.0337 0.0361
01:01-02:00, Mon., 24 Mar. 0.0374 0.0335 0.0358
00:01-01:00, Mon., 24 Mar. 0.0391 0.0344 0.0360
23:01-24:00, Sun., 23 Mar. 0.0389 0.0337 0.0359
22:01-23:00, Sun., 23 Mar. 0.0387 0.0329 0.0357
21:01-22:00, Sun., 23 Mar. 0.0372 0.0332 0.0354
20:01-21:00, Sun., 23 Mar. 0.0377 0.0337 0.0358
19:01-20:00, Sun., 23 Mar. 0.0386 0.0340 0.0360
18:01-19:00, Sun., 23 Mar. 0.0402 0.0345 0.0361
17:01-18:00, Sun., 23 Mar. 0.0378 0.0341 0.0361
16:01-17:00, Sun., 23 Mar. 0.0391 0.0347 0.0362
15:01-16:00, Sun., 23 Mar. 0.0406 0.0336 0.0362
14:01-15:00, Sun., 23 Mar. 0.0384 0.0340 0.0361
13:01-14:00, Sun., 23 Mar. 0.0381 0.0345 0.0363
12:01-13:00, Sun., 23 Mar. 0.0387 0.0344 0.0361
11:01-12:00, Sun., 23 Mar. 0.0394 0.0343 0.0364
10:01-11:00, Sun., 23 Mar. 0.0393 0.0344 0.0364
09:01-10:00, Sun., 23 Mar. 0.0390 0.0341 0.0363
08:01-09:00, Sun., 23 Mar. 0.0397 0.0337 0.0360
07:01-08:00, Sun., 23 Mar. 0.0396 0.0330 0.0360
06:01-07:00, Sun., 23 Mar. 0.0392 0.0329 0.0357
05:01-06:00, Sun., 23 Mar. 0.0371 0.0336 0.0359
04:01-05:00, Sun., 23 Mar. 0.0394 0.0335 0.0358
03:01-04:00, Sun., 23 Mar. 0.0380 0.0338 0.0359
02:01-03:00, Sun., 23 Mar. 0.0387 0.0336 0.0359
01:01-02:00, Sun., 23 Mar. 0.0391 0.0342 0.0361
00:01-01:00, Sun., 23 Mar. 0.0376 0.0346 0.0360
23:01-24:00, Sat., 22 Mar. 0.0384 0.0331 0.0360
22:01-23:00, Sat., 22 Mar. 0.0387 0.0337 0.0360
21:01-22:00, Sat., 22 Mar. 0.0395 0.0349 0.0364
20:01-21:00, Sat., 22 Mar. 0.0380 0.0343 0.0361
19:01-20:00, Sat., 22 Mar. 0.0384 0.0330 0.0357
18:01-19:00, Sat., 22 Mar. 0.0400 0.0340 0.0360
17:01-18:00, Sat., 22 Mar. 0.0398 0.0339 0.0362
16:01-17:00, Sat., 22 Mar. 0.0385 0.0340 0.0358
15:01-16:00, Sat., 22 Mar. 0.0393 0.0338 0.0360
14:01-15:00, Sat., 22 Mar. 0.0385 0.0336 0.0359
13:01-14:00, Sat., 22 Mar. 0.0407 0.0335 0.0360
12:01-13:00, Sat., 22 Mar. 0.0402 0.0337 0.0362
11:01-12:00, Sat., 22 Mar. 0.0390 0.0338 0.0364
10:01-11:00, Sat., 22 Mar. 0.0390 0.0337 0.0362
09:01-10:00, Sat., 22 Mar. 0.0390 0.0334 0.0362
08:01-09:00, Sat., 22 Mar. 0.0404 0.0340 0.0363
07:01-08:00, Sat., 22 Mar. 0.0385 0.0342 0.0359
06:01-07:00, Sat., 22 Mar. 0.0381 0.0339 0.0358
05:01-06:00, Sat., 22 Mar. 0.0390 0.0343 0.0362
04:01-05:00, Sat., 22 Mar. 0.0391 0.0343 0.0362
03:01-04:00, Sat., 22 Mar. 0.0400 0.0337 0.0364
02:01-03:00, Sat., 22 Mar. 0.0384 0.0336 0.0358
01:01-02:00, Sat., 22 Mar. 0.0371 0.0336 0.0356
00:01-01:00, Sat., 22 Mar. 0.0380 0.0332 0.0355
23:01-24:00, Fri., 21 Mar. 0.0389 0.0343 0.0360
22:01-23:00, Fri., 21 Mar. 0.0399 0.0331 0.0360
21:01-22:00, Fri., 21 Mar. 0.0371 0.0344 0.0359
20:01-21:00, Fri., 21 Mar. 0.0378 0.0334 0.0358
19:01-20:00, Fri., 21 Mar. 0.0376 0.0341 0.0360
18:01-19:00, Fri., 21 Mar. 0.0397 0.0330 0.0358
17:01-18:00, Fri., 21 Mar. 0.0395 0.0340 0.0362
16:01-17:00, Fri., 21 Mar. 0.0394 0.0332 0.0362
15:01-16:00, Fri., 21 Mar. 0.0418 0.0339 0.0361
14:01-15:00, Fri., 21 Mar. 0.0399 0.0345 0.0362
13:01-14:00, Fri., 21 Mar. 0.0395 0.0341 0.0361
12:01-13:00, Fri., 21 Mar. 0.0371 0.0329 0.0354
11:01-12:00, Fri., 21 Mar. 0.0380 0.0339 0.0358
10:01-11:00, Fri., 21 Mar. 0.0382 0.0328 0.0359
09:01-10:00, Fri., 21 Mar. 0.0398 0.0344 0.0361
08:01-09:00, Fri., 21 Mar. 0.0377 0.0343 0.0359
07:01-08:00, Fri., 21 Mar. 0.0387 0.0336 0.0362
06:01-07:00, Fri., 21 Mar. 0.0390 0.0337 0.0357
05:01-06:00, Fri., 21 Mar. 0.0384 0.0337 0.0361
04:01-05:00, Fri., 21 Mar. 0.0386 0.0339 0.0360
03:01-04:00, Fri., 21 Mar. 0.0388 0.0327 0.0356
02:01-03:00, Fri., 21 Mar. 0.0375 0.0337 0.0357
01:01-02:00, Fri., 21 Mar. 0.0383 0.0335 0.0353
00:01-01:00, Fri., 21 Mar. 0.0380 0.0327 0.0354
23:01-24:00, Thu., 20 Mar. 0.0372 0.0333 0.0352
22:01-23:00, Thu., 20 Mar. 0.0377 0.0328 0.0352
21:01-22:00, Thu., 20 Mar. 0.0381 0.0326 0.0354
20:01-21:00, Thu., 20 Mar. 0.0376 0.0334 0.0356
19:01-20:00, Thu., 20 Mar. 0.0377 0.0334 0.0352
18:01-19:00, Thu., 20 Mar. 0.0381 0.0336 0.0353
17:01-18:00, Thu., 20 Mar. 0.0370 0.0331 0.0355
16:01-17:00, Thu., 20 Mar. 0.0381 0.0331 0.0353
15:01-16:00, Thu., 20 Mar. 0.0381 0.0334 0.0356
14:01-15:00, Thu., 20 Mar. 0.0385 0.0336 0.0357
13:01-14:00, Thu., 20 Mar. 0.0388 0.0342 0.0358
12:01-13:00, Thu., 20 Mar. 0.0375 0.0333 0.0357
11:01-12:00, Thu., 20 Mar. 0.0384 0.0339 0.0357
10:01-11:00, Thu., 20 Mar. 0.0373 0.0321 0.0355
09:01-10:00, Thu., 20 Mar. 0.0370 0.0333 0.0352
08:01-09:00, Thu., 20 Mar. 0.0380 0.0328 0.0354
07:01-08:00, Thu., 20 Mar. 0.0371 0.0332 0.0352
06:01-07:00, Thu., 20 Mar. 0.0388 0.0331 0.0352
05:01-06:00, Thu., 20 Mar. 0.0385 0.0326 0.0353
04:01-05:00, Thu., 20 Mar. 0.0374 0.0332 0.0354
03:01-04:00, Thu., 20 Mar. 0.0384 0.0328 0.0352
02:01-03:00, Thu., 20 Mar. 0.0397 0.0337 0.0353
01:01-02:00, Thu., 20 Mar. 0.0365 0.0334 0.0351
00:01-01:00, Thu., 20 Mar. 0.0372 0.0336 0.0352
23:01-24:00, Wed., 19 Mar. 0.0366 0.0337 0.0352