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
10:01-11:00, Fri., 27 Mar. 0.0373 0.0336 0.0356
09:01-10:00, Fri., 27 Mar. 0.0381 0.0334 0.0359
08:01-09:00, Fri., 27 Mar. 0.0387 0.0341 0.0360
07:01-08:00, Fri., 27 Mar. 0.0374 0.0332 0.0356
06:01-07:00, Fri., 27 Mar. 0.0368 0.0331 0.0355
05:01-06:00, Fri., 27 Mar. 0.0372 0.0333 0.0354
04:01-05:00, Fri., 27 Mar. 0.0381 0.0336 0.0357
03:01-04:00, Fri., 27 Mar. 0.0390 0.0337 0.0356
02:01-03:00, Fri., 27 Mar. 0.0388 0.0326 0.0353
01:01-02:00, Fri., 27 Mar. 0.0377 0.0335 0.0355
00:01-01:00, Fri., 27 Mar. 0.0382 0.0326 0.0355
23:01-24:00, Thu., 26 Mar. 0.0392 0.0332 0.0355
22:01-23:00, Thu., 26 Mar. 0.0370 0.0335 0.0354
21:01-22:00, Thu., 26 Mar. 0.0383 0.0334 0.0355
20:01-21:00, Thu., 26 Mar. 0.0369 0.0336 0.0353
19:01-20:00, Thu., 26 Mar. 0.0367 0.0333 0.0351
18:01-19:00, Thu., 26 Mar. 0.0373 0.0331 0.0353
17:01-18:00, Thu., 26 Mar. 0.0397 0.0335 0.0355
16:01-17:00, Thu., 26 Mar. 0.0389 0.0338 0.0358
15:01-16:00, Thu., 26 Mar. 0.0404 0.0350 0.0370
14:01-15:00, Thu., 26 Mar. 0.0438 0.0360 0.0396
13:01-14:00, Thu., 26 Mar. 0.0465 0.0382 0.0423
12:01-13:00, Thu., 26 Mar. 0.0458 0.0365 0.0407
11:01-12:00, Thu., 26 Mar. 0.0438 0.0361 0.0395
10:01-11:00, Thu., 26 Mar. 0.0442 0.0363 0.0403
09:01-10:00, Thu., 26 Mar. 0.0447 0.0364 0.0411
08:01-09:00, Thu., 26 Mar. 0.0460 0.0375 0.0416
07:01-08:00, Thu., 26 Mar. 0.0499 0.0411 0.0461
06:01-07:00, Thu., 26 Mar. 0.0511 0.0395 0.0451
05:01-06:00, Thu., 26 Mar. 0.0457 0.0373 0.0413
04:01-05:00, Thu., 26 Mar. 0.0436 0.0374 0.0406
03:01-04:00, Thu., 26 Mar. 0.0448 0.0369 0.0409
02:01-03:00, Thu., 26 Mar. 0.0444 0.0372 0.0414
01:01-02:00, Thu., 26 Mar. 0.0457 0.0385 0.0416
00:01-01:00, Thu., 26 Mar. 0.0461 0.0393 0.0427
23:01-24:00, Wed., 25 Mar. 0.0444 0.0379 0.0412
22:01-23:00, Wed., 25 Mar. 0.0451 0.0375 0.0414
21:01-22:00, Wed., 25 Mar. 0.0438 0.0366 0.0411
20:01-21:00, Wed., 25 Mar. 0.0471 0.0400 0.0434
19:01-20:00, Wed., 25 Mar. 0.0509 0.0427 0.0475
18:01-19:00, Wed., 25 Mar. 0.0530 0.0450 0.0490
17:01-18:00, Wed., 25 Mar. 0.0547 0.0473 0.0510
16:01-17:00, Wed., 25 Mar. 0.0538 0.0428 0.0469
15:01-16:00, Wed., 25 Mar. 0.0481 0.0420 0.0452
14:01-15:00, Wed., 25 Mar. 0.0464 0.0381 0.0436
13:01-14:00, Wed., 25 Mar. 0.0475 0.0356 0.0406
12:01-13:00, Wed., 25 Mar. 0.0401 0.0345 0.0367
11:01-12:00, Wed., 25 Mar. 0.0397 0.0347 0.0364
10:01-11:00, Wed., 25 Mar. 0.0388 0.0340 0.0360
09:01-10:00, Wed., 25 Mar. 0.0393 0.0344 0.0364
08:01-09:00, Wed., 25 Mar. 0.0400 0.0341 0.0363
07:01-08:00, Wed., 25 Mar. 0.0380 0.0338 0.0359
06:01-07:00, Wed., 25 Mar. 0.0401 0.0339 0.0360
05:01-06:00, Wed., 25 Mar. 0.0396 0.0336 0.0360
04:01-05:00, Wed., 25 Mar. 0.0401 0.0340 0.0359
03:01-04:00, Wed., 25 Mar. 0.0386 0.0341 0.0362
02:01-03:00, Wed., 25 Mar. 0.0390 0.0345 0.0360
01:01-02:00, Wed., 25 Mar. 0.0394 0.0335 0.0357
00:01-01:00, Wed., 25 Mar. 0.0382 0.0335 0.0357
23:01-24:00, Tue., 24 Mar. 0.0390 0.0335 0.0359
22:01-23:00, Tue., 24 Mar. 0.0383 0.0338 0.0358
21:01-22:00, Tue., 24 Mar. 0.0375 0.0335 0.0358
20:01-21:00, Tue., 24 Mar. 0.0374 0.0338 0.0358
19:01-20:00, Tue., 24 Mar. 0.0372 0.0333 0.0358
18:01-19:00, Tue., 24 Mar. 0.0401 0.0334 0.0360
17:01-18:00, Tue., 24 Mar. 0.0386 0.0339 0.0358
16:01-17:00, Tue., 24 Mar. 0.0389 0.0337 0.0359
15:01-16:00, Tue., 24 Mar. 0.0389 0.0344 0.0361
14:01-15:00, Tue., 24 Mar. 0.0393 0.0341 0.0364
13:01-14:00, Tue., 24 Mar. 0.0395 0.0344 0.0362
12:01-13:00, Tue., 24 Mar. 0.0391 0.0340 0.0362
11:01-12:00, Tue., 24 Mar. 0.0400 0.0333 0.0360
10:01-11:00, Tue., 24 Mar. 0.0394 0.0342 0.0363
09:01-10:00, Tue., 24 Mar. 0.0382 0.0339 0.0361
08:01-09:00, Tue., 24 Mar. 0.0382 0.0336 0.0359
07:01-08:00, Tue., 24 Mar. 0.0387 0.0335 0.0359
06:01-07:00, Tue., 24 Mar. 0.0377 0.0339 0.0359
05:01-06:00, Tue., 24 Mar. 0.0376 0.0334 0.0357
04:01-05:00, Tue., 24 Mar. 0.0381 0.0335 0.0359
03:01-04:00, Tue., 24 Mar. 0.0378 0.0332 0.0357
02:01-03:00, Tue., 24 Mar. 0.0383 0.0332 0.0357
01:01-02:00, Tue., 24 Mar. 0.0394 0.0346 0.0361
00:01-01:00, Tue., 24 Mar. 0.0375 0.0335 0.0358
23:01-24:00, Mon., 23 Mar. 0.0381 0.0333 0.0360
22:01-23:00, Mon., 23 Mar. 0.0381 0.0336 0.0357
21:01-22:00, Mon., 23 Mar. 0.0370 0.0334 0.0357
20:01-21:00, Mon., 23 Mar. 0.0393 0.0341 0.0359
19:01-20:00, Mon., 23 Mar. 0.0403 0.0331 0.0357
18:01-19:00, Mon., 23 Mar. 0.0388 0.0339 0.0359
17:01-18:00, Mon., 23 Mar. 0.0377 0.0334 0.0358
16:01-17:00, Mon., 23 Mar. 0.0375 0.0326 0.0358
15:01-16:00, Mon., 23 Mar. 0.0404 0.0341 0.0360
14:01-15:00, Mon., 23 Mar. 0.0380 0.0336 0.0359
13:01-14:00, Mon., 23 Mar. 0.0389 0.0338 0.0359
12:01-13:00, Mon., 23 Mar. 0.0397 0.0335 0.0361
11:01-12:00, Mon., 23 Mar. 0.0415 0.0339 0.0369
10:01-11:00, Mon., 23 Mar. 0.0421 0.0360 0.0382
09:01-10:00, Mon., 23 Mar. 0.0423 0.0364 0.0396
08:01-09:00, Mon., 23 Mar. 0.0447 0.0364 0.0408
07:01-08:00, Mon., 23 Mar. 0.0458 0.0369 0.0396
06:01-07:00, Mon., 23 Mar. 0.0410 0.0346 0.0369
05:01-06:00, Mon., 23 Mar. 0.0391 0.0347 0.0361
04:01-05:00, Mon., 23 Mar. 0.0402 0.0343 0.0362
03:01-04:00, Mon., 23 Mar. 0.0394 0.0341 0.0361
02:01-03:00, Mon., 23 Mar. 0.0392 0.0343 0.0364
01:01-02:00, Mon., 23 Mar. 0.0398 0.0340 0.0363
00:01-01:00, Mon., 23 Mar. 0.0400 0.0341 0.0364
23:01-24:00, Sun., 22 Mar. 0.0385 0.0341 0.0359
22:01-23:00, Sun., 22 Mar. 0.0388 0.0337 0.0358
21:01-22:00, Sun., 22 Mar. 0.0383 0.0337 0.0358
20:01-21:00, Sun., 22 Mar. 0.0391 0.0342 0.0360
19:01-20:00, Sun., 22 Mar. 0.0381 0.0341 0.0358
18:01-19:00, Sun., 22 Mar. 0.0380 0.0332 0.0357
17:01-18:00, Sun., 22 Mar. 0.0392 0.0343 0.0362
16:01-17:00, Sun., 22 Mar. 0.0400 0.0341 0.0361
15:01-16:00, Sun., 22 Mar. 0.0398 0.0341 0.0363
14:01-15:00, Sun., 22 Mar. 0.0391 0.0340 0.0363
13:01-14:00, Sun., 22 Mar. 0.0400 0.0342 0.0365
12:01-13:00, Sun., 22 Mar. 0.0398 0.0344 0.0365
11:01-12:00, Sun., 22 Mar. 0.0400 0.0347 0.0364
10:01-11:00, Sun., 22 Mar. 0.0410 0.0344 0.0367
09:01-10:00, Sun., 22 Mar. 0.0405 0.0346 0.0367
08:01-09:00, Sun., 22 Mar. 0.0390 0.0345 0.0367
07:01-08:00, Sun., 22 Mar. 0.0398 0.0347 0.0366
06:01-07:00, Sun., 22 Mar. 0.0389 0.0343 0.0363
05:01-06:00, Sun., 22 Mar. 0.0401 0.0338 0.0361
04:01-05:00, Sun., 22 Mar. 0.0385 0.0331 0.0361
03:01-04:00, Sun., 22 Mar. 0.0397 0.0342 0.0362
02:01-03:00, Sun., 22 Mar. 0.0393 0.0342 0.0362
01:01-02:00, Sun., 22 Mar. 0.0394 0.0331 0.0360
00:01-01:00, Sun., 22 Mar. 0.0400 0.0340 0.0359
23:01-24:00, Sat., 21 Mar. 0.0391 0.0338 0.0361
22:01-23:00, Sat., 21 Mar. 0.0396 0.0333 0.0359
21:01-22:00, Sat., 21 Mar. 0.0377 0.0338 0.0357
20:01-21:00, Sat., 21 Mar. 0.0381 0.0332 0.0357
19:01-20:00, Sat., 21 Mar. 0.0389 0.0333 0.0360
18:01-19:00, Sat., 21 Mar. 0.0382 0.0344 0.0359
17:01-18:00, Sat., 21 Mar. 0.0387 0.0338 0.0360
16:01-17:00, Sat., 21 Mar. 0.0390 0.0344 0.0362
15:01-16:00, Sat., 21 Mar. 0.0389 0.0340 0.0362
14:01-15:00, Sat., 21 Mar. 0.0391 0.0347 0.0361
13:01-14:00, Sat., 21 Mar. 0.0393 0.0344 0.0362
12:01-13:00, Sat., 21 Mar. 0.0376 0.0340 0.0360
11:01-12:00, Sat., 21 Mar. 0.0379 0.0331 0.0359
10:01-11:00, Sat., 21 Mar. 0.0374 0.0334 0.0358
09:01-10:00, Sat., 21 Mar. 0.0380 0.0334 0.0357
08:01-09:00, Sat., 21 Mar. 0.0392 0.0341 0.0359
07:01-08:00, Sat., 21 Mar. 0.0387 0.0330 0.0357
06:01-07:00, Sat., 21 Mar. 0.0374 0.0341 0.0358
05:01-06:00, Sat., 21 Mar. 0.0378 0.0337 0.0360
04:01-05:00, Sat., 21 Mar. 0.0388 0.0338 0.0358
03:01-04:00, Sat., 21 Mar. 0.0378 0.0339 0.0356
02:01-03:00, Sat., 21 Mar. 0.0389 0.0336 0.0356
01:01-02:00, Sat., 21 Mar. 0.0385 0.0341 0.0359
00:01-01:00, Sat., 21 Mar. 0.0379 0.0333 0.0358
23:01-24:00, Fri., 20 Mar. 0.0396 0.0338 0.0358
22:01-23:00, Fri., 20 Mar. 0.0381 0.0331 0.0354
21:01-22:00, Fri., 20 Mar. 0.0408 0.0325 0.0356
20:01-21:00, Fri., 20 Mar. 0.0393 0.0335 0.0359
19:01-20:00, Fri., 20 Mar. 0.0395 0.0334 0.0363
18:01-19:00, Fri., 20 Mar. 0.0389 0.0344 0.0362
17:01-18:00, Fri., 20 Mar. 0.0391 0.0346 0.0363
16:01-17:00, Fri., 20 Mar. 0.0381 0.0342 0.0359
15:01-16:00, Fri., 20 Mar. 0.0400 0.0341 0.0363
14:01-15:00, Fri., 20 Mar. 0.0434 0.0359 0.0387
13:01-14:00, Fri., 20 Mar. 0.0490 0.0395 0.0443
12:01-13:00, Fri., 20 Mar. 0.0506 0.0432 0.0466
11:01-12:00, Fri., 20 Mar. 0.0496 0.0364 0.0421
10:01-11:00, Fri., 20 Mar. 0.0440 0.0361 0.0397
09:01-10:00, Fri., 20 Mar. 0.0453 0.0359 0.0398
08:01-09:00, Fri., 20 Mar. 0.0427 0.0360 0.0382
07:01-08:00, Fri., 20 Mar. 0.0427 0.0349 0.0372
06:01-07:00, Fri., 20 Mar. 0.0402 0.0345 0.0365
05:01-06:00, Fri., 20 Mar. 0.0409 0.0337 0.0366
04:01-05:00, Fri., 20 Mar. 0.0391 0.0339 0.0362
03:01-04:00, Fri., 20 Mar. 0.0379 0.0350 0.0363
02:01-03:00, Fri., 20 Mar. 0.0404 0.0354 0.0375
01:01-02:00, Fri., 20 Mar. 0.0453 0.0360 0.0409
00:01-01:00, Fri., 20 Mar. 0.0504 0.0429 0.0463
23:01-24:00, Thu., 19 Mar. 0.0493 0.0387 0.0442
22:01-23:00, Thu., 19 Mar. 0.0447 0.0357 0.0394
21:01-22:00, Thu., 19 Mar. 0.0400 0.0347 0.0366
20:01-21:00, Thu., 19 Mar. 0.0382 0.0346 0.0362
19:01-20:00, Thu., 19 Mar. 0.0387 0.0343 0.0362
18:01-19:00, Thu., 19 Mar. 0.0397 0.0344 0.0362
17:01-18:00, Thu., 19 Mar. 0.0384 0.0341 0.0361
16:01-17:00, Thu., 19 Mar. 0.0396 0.0347 0.0363
15:01-16:00, Thu., 19 Mar. 0.0390 0.0339 0.0363
14:01-15:00, Thu., 19 Mar. 0.0404 0.0346 0.0363
13:01-14:00, Thu., 19 Mar. 0.0406 0.0346 0.0366
12:01-13:00, Thu., 19 Mar. 0.0393 0.0345 0.0365
11:01-12:00, Thu., 19 Mar. 0.0376 0.0345 0.0363
10:01-11:00, Thu., 19 Mar. 0.0410 0.0349 0.0371
09:01-10:00, Thu., 19 Mar. 0.0391 0.0346 0.0365
08:01-09:00, Thu., 19 Mar. 0.0399 0.0346 0.0366
07:01-08:00, Thu., 19 Mar. 0.0390 0.0346 0.0366
06:01-07:00, Thu., 19 Mar. 0.0394 0.0349 0.0369
05:01-06:00, Thu., 19 Mar. 0.0412 0.0347 0.0373
04:01-05:00, Thu., 19 Mar. 0.0377 0.0337 0.0358
03:01-04:00, Thu., 19 Mar. 0.0414 0.0339 0.0363
02:01-03:00, Thu., 19 Mar. 0.0392 0.0340 0.0361
01:01-02:00, Thu., 19 Mar. 0.0376 0.0341 0.0358
00:01-01:00, Thu., 19 Mar. 0.0384 0.0340 0.0359
23:01-24:00, Wed., 18 Mar. 0.0372 0.0327 0.0357
22:01-23:00, Wed., 18 Mar. 0.0374 0.0335 0.0359
21:01-22:00, Wed., 18 Mar. 0.0401 0.0339 0.0359
20:01-21:00, Wed., 18 Mar. 0.0393 0.0337 0.0357
19:01-20:00, Wed., 18 Mar. 0.0381 0.0337 0.0357
18:01-19:00, Wed., 18 Mar. 0.0374 0.0337 0.0358
17:01-18:00, Wed., 18 Mar. 0.0391 0.0337 0.0359
16:01-17:00, Wed., 18 Mar. 0.0397 0.0337 0.0359
15:01-16:00, Wed., 18 Mar. 0.0381 0.0323 0.0356
14:01-15:00, Wed., 18 Mar. 0.0380 0.0337 0.0357
13:01-14:00, Wed., 18 Mar. 0.0376 0.0333 0.0357
12:01-13:00, Wed., 18 Mar. 0.0384 0.0338 0.0358
11:01-12:00, Wed., 18 Mar. 0.0382 0.0331 0.0358
10:01-11:00, Wed., 18 Mar. 0.0386 0.0338 0.0359
09:01-10:00, Wed., 18 Mar. 0.0383 0.0343 0.0360
08:01-09:00, Wed., 18 Mar. 0.0387 0.0332 0.0361
07:01-08:00, Wed., 18 Mar. 0.0396 0.0345 0.0362
06:01-07:00, Wed., 18 Mar. 0.0379 0.0335 0.0359
05:01-06:00, Wed., 18 Mar. 0.0383 0.0336 0.0358
04:01-05:00, Wed., 18 Mar. 0.0381 0.0328 0.0359
03:01-04:00, Wed., 18 Mar. 0.0389 0.0337 0.0361
02:01-03:00, Wed., 18 Mar. 0.0378 0.0334 0.0359
01:01-02:00, Wed., 18 Mar. 0.0377 0.0337 0.0357
00:01-01:00, Wed., 18 Mar. 0.0382 0.0334 0.0356
23:01-24:00, Tue., 17 Mar. 0.0373 0.0336 0.0355
22:01-23:00, Tue., 17 Mar. 0.0375 0.0342 0.0357
21:01-22:00, Tue., 17 Mar. 0.0373 0.0338 0.0356
20:01-21:00, Tue., 17 Mar. 0.0373 0.0335 0.0356
19:01-20:00, Tue., 17 Mar. 0.0378 0.0336 0.0356
18:01-19:00, Tue., 17 Mar. 0.0381 0.0338 0.0357
17:01-18:00, Tue., 17 Mar. 0.0381 0.0335 0.0358
16:01-17:00, Tue., 17 Mar. 0.0394 0.0340 0.0360
15:01-16:00, Tue., 17 Mar. 0.0380 0.0336 0.0360
14:01-15:00, Tue., 17 Mar. 0.0380 0.0340 0.0358
13:01-14:00, Tue., 17 Mar. 0.0387 0.0343 0.0362
12:01-13:00, Tue., 17 Mar. 0.0387 0.0342 0.0361
11:01-12:00, Tue., 17 Mar. 0.0386 0.0337 0.0360