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
08:01-09:00, Sat., 27 Jul. 0.0389 0.0345 0.0364
07:01-08:00, Sat., 27 Jul. 0.0391 0.0343 0.0363
06:01-07:00, Sat., 27 Jul. 0.0383 0.0334 0.0360
05:01-06:00, Sat., 27 Jul. 0.0399 0.0337 0.0363
04:01-05:00, Sat., 27 Jul. 0.0393 0.0341 0.0364
03:01-04:00, Sat., 27 Jul. 0.0393 0.0348 0.0364
02:01-03:00, Sat., 27 Jul. 0.0388 0.0342 0.0363
01:01-02:00, Sat., 27 Jul. 0.0396 0.0329 0.0365
00:01-01:00, Sat., 27 Jul. 0.0407 0.0341 0.0367
23:01-24:00, Fri., 26 Jul. 0.0412 0.0352 0.0371
22:01-23:00, Fri., 26 Jul. 0.0434 0.0363 0.0399
21:01-22:00, Fri., 26 Jul. 0.0450 0.0331 0.0379
20:01-21:00, Fri., 26 Jul. 0.0388 0.0342 0.0361
08:01-09:00, Fri., 26 Jul. 0.0387 0.0348 0.0363
07:01-08:00, Fri., 26 Jul. 0.0388 0.0339 0.0362
06:01-07:00, Fri., 26 Jul. 0.0387 0.0331 0.0362
05:01-06:00, Fri., 26 Jul. 0.0380 0.0342 0.0362
04:01-05:00, Fri., 26 Jul. 0.0385 0.0344 0.0363
03:01-04:00, Fri., 26 Jul. 0.0377 0.0338 0.0360
02:01-03:00, Fri., 26 Jul. 0.0387 0.0348 0.0362
01:01-02:00, Fri., 26 Jul. 0.0388 0.0341 0.0363
00:01-01:00, Fri., 26 Jul. 0.0374 0.0344 0.0359
23:01-24:00, Thu., 25 Jul. 0.0389 0.0339 0.0358
22:01-23:00, Thu., 25 Jul. 0.0406 0.0331 0.0362
21:01-22:00, Thu., 25 Jul. 0.0395 0.0336 0.0363
20:01-21:00, Thu., 25 Jul. 0.0425 0.0350 0.0391
19:01-20:00, Thu., 25 Jul. 0.0495 0.0399 0.0447
18:01-19:00, Thu., 25 Jul. 0.0504 0.0425 0.0454
07:01-08:00, Thu., 25 Jul. 0.0396 0.0346 0.0364
06:01-07:00, Thu., 25 Jul. 0.0412 0.0343 0.0363
05:01-06:00, Thu., 25 Jul. 0.0397 0.0340 0.0364
04:01-05:00, Thu., 25 Jul. 0.0389 0.0341 0.0360
03:01-04:00, Thu., 25 Jul. 0.0404 0.0347 0.0364
02:01-03:00, Thu., 25 Jul. 0.0397 0.0332 0.0362
01:01-02:00, Thu., 25 Jul. 0.0390 0.0343 0.0363
00:01-01:00, Thu., 25 Jul. 0.0390 0.0336 0.0359
23:01-24:00, Wed., 24 Jul. 0.0372 0.0339 0.0356
22:01-23:00, Wed., 24 Jul. 0.0391 0.0332 0.0358
21:01-22:00, Wed., 24 Jul. 0.0388 0.0333 0.0359
20:01-21:00, Wed., 24 Jul. 0.0375 0.0334 0.0355
19:01-20:00, Wed., 24 Jul. 0.0379 0.0348 0.0359
16:01-17:00, Wed., 24 Jul. 0.0372 0.0336 0.0358
15:01-16:00, Wed., 24 Jul. 0.0389 0.0343 0.0361
14:01-15:00, Wed., 24 Jul. 0.0405 0.0344 0.0369
13:01-14:00, Wed., 24 Jul. 0.0424 0.0356 0.0392
07:01-08:00, Wed., 24 Jul. 0.0382 0.0348 0.0361
06:01-07:00, Wed., 24 Jul. 0.0400 0.0341 0.0363
05:01-06:00, Wed., 24 Jul. 0.0398 0.0346 0.0365
04:01-05:00, Wed., 24 Jul. 0.0381 0.0342 0.0361
03:01-04:00, Wed., 24 Jul. 0.0415 0.0342 0.0360
02:01-03:00, Wed., 24 Jul. 0.0390 0.0339 0.0357
01:01-02:00, Wed., 24 Jul. 0.0391 0.0334 0.0360
00:01-01:00, Wed., 24 Jul. 0.0395 0.0338 0.0358
23:01-24:00, Tue., 23 Jul. 0.0379 0.0331 0.0359
22:01-23:00, Tue., 23 Jul. 0.0383 0.0335 0.0358
21:01-22:00, Tue., 23 Jul. 0.0387 0.0337 0.0358
20:01-21:00, Tue., 23 Jul. 0.0372 0.0331 0.0355
19:01-20:00, Tue., 23 Jul. 0.0399 0.0334 0.0358
18:01-19:00, Tue., 23 Jul. 0.0363 0.0347 0.0356
08:01-09:00, Tue., 23 Jul. 0.0368 0.0355 0.0361
07:01-08:00, Tue., 23 Jul. 0.0388 0.0348 0.0366
06:01-07:00, Tue., 23 Jul. 0.0399 0.0342 0.0364
05:01-06:00, Tue., 23 Jul. 0.0390 0.0342 0.0361
04:01-05:00, Tue., 23 Jul. 0.0389 0.0344 0.0363
03:01-04:00, Tue., 23 Jul. 0.0394 0.0334 0.0362
02:01-03:00, Tue., 23 Jul. 0.0394 0.0330 0.0356
01:01-02:00, Tue., 23 Jul. 0.0395 0.0340 0.0362
00:01-01:00, Tue., 23 Jul. 0.0409 0.0354 0.0374
23:01-24:00, Mon., 22 Jul. 0.0476 0.0357 0.0416
22:01-23:00, Mon., 22 Jul. 0.0604 0.0432 0.0524
21:01-22:00, Mon., 22 Jul. 0.0598 0.0345 0.0413
20:01-21:00, Mon., 22 Jul. 0.0401 0.0346 0.0364
19:01-20:00, Mon., 22 Jul. 0.0370 0.0348 0.0359
08:01-09:00, Mon., 22 Jul. 0.0374 0.0346 0.0362
07:01-08:00, Mon., 22 Jul. 0.0396 0.0344 0.0365
06:01-07:00, Mon., 22 Jul. 0.0394 0.0340 0.0362
05:01-06:00, Mon., 22 Jul. 0.0384 0.0337 0.0359
04:01-05:00, Mon., 22 Jul. 0.0380 0.0337 0.0362
03:01-04:00, Mon., 22 Jul. 0.0382 0.0327 0.0359
02:01-03:00, Mon., 22 Jul. 0.0383 0.0338 0.0358
01:01-02:00, Mon., 22 Jul. 0.0400 0.0340 0.0360
00:01-01:00, Mon., 22 Jul. 0.0382 0.0336 0.0356
23:01-24:00, Sun., 21 Jul. 0.0391 0.0330 0.0359
22:01-23:00, Sun., 21 Jul. 0.0384 0.0339 0.0358
21:01-22:00, Sun., 21 Jul. 0.0378 0.0334 0.0357
20:01-21:00, Sun., 21 Jul. 0.0372 0.0339 0.0359
19:01-20:00, Sun., 21 Jul. 0.0374 0.0329 0.0356
18:01-19:00, Sun., 21 Jul. 0.0369 0.0339 0.0353
09:01-10:00, Sun., 21 Jul. 0.0371 0.0363 0.0368
08:01-09:00, Sun., 21 Jul. 0.0384 0.0338 0.0362
07:01-08:00, Sun., 21 Jul. 0.0425 0.0340 0.0365
06:01-07:00, Sun., 21 Jul. 0.0421 0.0346 0.0369
05:01-06:00, Sun., 21 Jul. 0.0429 0.0362 0.0389
04:01-05:00, Sun., 21 Jul. 0.0441 0.0368 0.0404
03:01-04:00, Sun., 21 Jul. 0.0420 0.0348 0.0374
02:01-03:00, Sun., 21 Jul. 0.0419 0.0351 0.0380
01:01-02:00, Sun., 21 Jul. 0.0527 0.0385 0.0437
00:01-01:00, Sun., 21 Jul. 0.0654 0.0461 0.0570
23:01-24:00, Sat., 20 Jul. 0.0623 0.0436 0.0545
22:01-23:00, Sat., 20 Jul. 0.0628 0.0405 0.0506
21:01-22:00, Sat., 20 Jul. 0.0867 0.0598 0.0725
20:01-21:00, Sat., 20 Jul. 0.0616 0.0365 0.0433
19:01-20:00, Sat., 20 Jul. 0.0471 0.0402 0.0431
07:01-08:00, Sat., 20 Jul. 0.0390 0.0340 0.0365
06:01-07:00, Sat., 20 Jul. 0.0390 0.0336 0.0362
05:01-06:00, Sat., 20 Jul. 0.0404 0.0335 0.0362
04:01-05:00, Sat., 20 Jul. 0.0386 0.0323 0.0357
03:01-04:00, Sat., 20 Jul. 0.0389 0.0336 0.0359
02:01-03:00, Sat., 20 Jul. 0.0387 0.0340 0.0360
01:01-02:00, Sat., 20 Jul. 0.0374 0.0342 0.0359
00:01-01:00, Sat., 20 Jul. 0.0373 0.0329 0.0359
23:01-24:00, Fri., 19 Jul. 0.0387 0.0336 0.0358
22:01-23:00, Fri., 19 Jul. 0.0385 0.0325 0.0360
21:01-22:00, Fri., 19 Jul. 0.0377 0.0339 0.0356
20:01-21:00, Fri., 19 Jul. 0.0385 0.0337 0.0355
19:01-20:00, Fri., 19 Jul. 0.0374 0.0339 0.0355
18:01-19:00, Fri., 19 Jul. 0.0360 0.0341 0.0351
08:01-09:00, Fri., 19 Jul. 0.0379 0.0342 0.0358
07:01-08:00, Fri., 19 Jul. 0.0390 0.0345 0.0363
06:01-07:00, Fri., 19 Jul. 0.0377 0.0347 0.0361
05:01-06:00, Fri., 19 Jul. 0.0401 0.0326 0.0359
04:01-05:00, Fri., 19 Jul. 0.0374 0.0328 0.0356
03:01-04:00, Fri., 19 Jul. 0.0377 0.0339 0.0356
02:01-03:00, Fri., 19 Jul. 0.0374 0.0337 0.0356
01:01-02:00, Fri., 19 Jul. 0.0380 0.0330 0.0355
00:01-01:00, Fri., 19 Jul. 0.0384 0.0332 0.0357
23:01-24:00, Thu., 18 Jul. 0.0392 0.0335 0.0356
22:01-23:00, Thu., 18 Jul. 0.0394 0.0339 0.0358
21:01-22:00, Thu., 18 Jul. 0.0380 0.0338 0.0355
20:01-21:00, Thu., 18 Jul. 0.0375 0.0333 0.0359
19:01-20:00, Thu., 18 Jul. 0.0380 0.0336 0.0359
18:01-19:00, Thu., 18 Jul. 0.0383 0.0333 0.0358
17:01-18:00, Thu., 18 Jul. 0.0378 0.0340 0.0359
09:01-10:00, Thu., 18 Jul. 0.0383 0.0337 0.0358
08:01-09:00, Thu., 18 Jul. 0.0386 0.0337 0.0359
07:01-08:00, Thu., 18 Jul. 0.0391 0.0333 0.0358
06:01-07:00, Thu., 18 Jul. 0.0397 0.0336 0.0359
05:01-06:00, Thu., 18 Jul. 0.0371 0.0339 0.0357
04:01-05:00, Thu., 18 Jul. 0.0384 0.0340 0.0359
03:01-04:00, Thu., 18 Jul. 0.0377 0.0337 0.0358
02:01-03:00, Thu., 18 Jul. 0.0373 0.0329 0.0356
01:01-02:00, Thu., 18 Jul. 0.0391 0.0337 0.0358
00:01-01:00, Thu., 18 Jul. 0.0395 0.0334 0.0358
23:01-24:00, Wed., 17 Jul. 0.0385 0.0334 0.0356
22:01-23:00, Wed., 17 Jul. 0.0388 0.0338 0.0357
21:01-22:00, Wed., 17 Jul. 0.0374 0.0328 0.0355
20:01-21:00, Wed., 17 Jul. 0.0374 0.0336 0.0356
19:01-20:00, Wed., 17 Jul. 0.0386 0.0339 0.0358
18:01-19:00, Wed., 17 Jul. 0.0381 0.0337 0.0358
17:01-18:00, Wed., 17 Jul. 0.0384 0.0338 0.0359
16:01-17:00, Wed., 17 Jul. 0.0391 0.0336 0.0360
15:01-16:00, Wed., 17 Jul. 0.0367 0.0356 0.0362
12:01-13:00, Wed., 17 Jul. 0.0373 0.0335 0.0356
11:01-12:00, Wed., 17 Jul. 0.0386 0.0341 0.0358
10:01-11:00, Wed., 17 Jul. 0.0376 0.0336 0.0356
09:01-10:00, Wed., 17 Jul. 0.0382 0.0340 0.0358
08:01-09:00, Wed., 17 Jul. 0.0380 0.0330 0.0353
07:01-08:00, Wed., 17 Jul. 0.0385 0.0331 0.0356
06:01-07:00, Wed., 17 Jul. 0.0372 0.0334 0.0354
05:01-06:00, Wed., 17 Jul. 0.0381 0.0338 0.0359
04:01-05:00, Wed., 17 Jul. 0.0396 0.0344 0.0365
03:01-04:00, Wed., 17 Jul. 0.0416 0.0358 0.0375
02:01-03:00, Wed., 17 Jul. 0.0417 0.0358 0.0382
01:01-02:00, Wed., 17 Jul. 0.0417 0.0357 0.0385
00:01-01:00, Wed., 17 Jul. 0.0409 0.0347 0.0370
23:01-24:00, Tue., 16 Jul. 0.0381 0.0340 0.0360
22:01-23:00, Tue., 16 Jul. 0.0398 0.0346 0.0365
21:01-22:00, Tue., 16 Jul. 0.0380 0.0341 0.0357
20:01-21:00, Tue., 16 Jul. 0.0395 0.0336 0.0358
19:01-20:00, Tue., 16 Jul. 0.0413 0.0339 0.0376
18:01-19:00, Tue., 16 Jul. 0.0433 0.0363 0.0394
17:01-18:00, Tue., 16 Jul. 0.0454 0.0379 0.0419
16:01-17:00, Tue., 16 Jul. 0.0463 0.0378 0.0416
15:01-16:00, Tue., 16 Jul. 0.0445 0.0355 0.0384
14:01-15:00, Tue., 16 Jul. 0.0398 0.0353 0.0367
13:01-14:00, Tue., 16 Jul. 0.0400 0.0344 0.0372
12:01-13:00, Tue., 16 Jul. 0.0392 0.0337 0.0358
11:01-12:00, Tue., 16 Jul. 0.0388 0.0335 0.0360
10:01-11:00, Tue., 16 Jul. 0.0381 0.0334 0.0357
09:01-10:00, Tue., 16 Jul. 0.0378 0.0339 0.0358
08:01-09:00, Tue., 16 Jul. 0.0374 0.0338 0.0354
07:01-08:00, Tue., 16 Jul. 0.0391 0.0339 0.0358
06:01-07:00, Tue., 16 Jul. 0.0396 0.0338 0.0360
05:01-06:00, Tue., 16 Jul. 0.0372 0.0335 0.0355
04:01-05:00, Tue., 16 Jul. 0.0373 0.0334 0.0355
03:01-04:00, Tue., 16 Jul. 0.0385 0.0330 0.0356
02:01-03:00, Tue., 16 Jul. 0.0373 0.0335 0.0355
01:01-02:00, Tue., 16 Jul. 0.0372 0.0332 0.0356
00:01-01:00, Tue., 16 Jul. 0.0381 0.0336 0.0355
23:01-24:00, Mon., 15 Jul. 0.0373 0.0334 0.0354
22:01-23:00, Mon., 15 Jul. 0.0382 0.0328 0.0356
21:01-22:00, Mon., 15 Jul. 0.0386 0.0331 0.0357
20:01-21:00, Mon., 15 Jul. 0.0370 0.0323 0.0358
19:01-20:00, Mon., 15 Jul. 0.0384 0.0337 0.0354
18:01-19:00, Mon., 15 Jul. 0.0377 0.0338 0.0355
17:01-18:00, Mon., 15 Jul. 0.0370 0.0341 0.0356
16:01-17:00, Mon., 15 Jul. 0.0381 0.0338 0.0357
15:01-16:00, Mon., 15 Jul. 0.0376 0.0333 0.0358
14:01-15:00, Mon., 15 Jul. 0.0390 0.0339 0.0359
13:01-14:00, Mon., 15 Jul. 0.0378 0.0339 0.0360
12:01-13:00, Mon., 15 Jul. 0.0373 0.0334 0.0357
11:01-12:00, Mon., 15 Jul. 0.0395 0.0337 0.0355
10:01-11:00, Mon., 15 Jul. 0.0391 0.0326 0.0355
09:01-10:00, Mon., 15 Jul. 0.0390 0.0332 0.0360
08:01-09:00, Mon., 15 Jul. 0.0395 0.0349 0.0365
07:01-08:00, Mon., 15 Jul. 0.0389 0.0333 0.0358
06:01-07:00, Mon., 15 Jul. 0.0379 0.0337 0.0356
05:01-06:00, Mon., 15 Jul. 0.0394 0.0335 0.0358
04:01-05:00, Mon., 15 Jul. 0.0381 0.0333 0.0354
03:01-04:00, Mon., 15 Jul. 0.0381 0.0329 0.0355
02:01-03:00, Mon., 15 Jul. 0.0385 0.0336 0.0357
01:01-02:00, Mon., 15 Jul. 0.0387 0.0335 0.0356
00:01-01:00, Mon., 15 Jul. 0.0395 0.0339 0.0359
23:01-24:00, Sun., 14 Jul. 0.0373 0.0337 0.0355
22:01-23:00, Sun., 14 Jul. 0.0378 0.0337 0.0357
21:01-22:00, Sun., 14 Jul. 0.0390 0.0340 0.0360
20:01-21:00, Sun., 14 Jul. 0.0387 0.0340 0.0359
19:01-20:00, Sun., 14 Jul. 0.0382 0.0335 0.0358
18:01-19:00, Sun., 14 Jul. 0.0377 0.0338 0.0357
17:01-18:00, Sun., 14 Jul. 0.0374 0.0337 0.0356
16:01-17:00, Sun., 14 Jul. 0.0401 0.0337 0.0358
15:01-16:00, Sun., 14 Jul. 0.0390 0.0324 0.0357
14:01-15:00, Sun., 14 Jul. 0.0396 0.0339 0.0357
13:01-14:00, Sun., 14 Jul. 0.0407 0.0341 0.0365
12:01-13:00, Sun., 14 Jul. 0.0429 0.0354 0.0376
11:01-12:00, Sun., 14 Jul. 0.0403 0.0348 0.0369
10:01-11:00, Sun., 14 Jul. 0.0426 0.0356 0.0385
09:01-10:00, Sun., 14 Jul. 0.0473 0.0388 0.0424
08:01-09:00, Sun., 14 Jul. 0.0542 0.0441 0.0482
07:01-08:00, Sun., 14 Jul. 0.0502 0.0437 0.0464
06:01-07:00, Sun., 14 Jul. 0.0490 0.0408 0.0445
05:01-06:00, Sun., 14 Jul. 0.0508 0.0420 0.0467
04:01-05:00, Sun., 14 Jul. 0.0445 0.0356 0.0398
03:01-04:00, Sun., 14 Jul. 0.0401 0.0332 0.0364
02:01-03:00, Sun., 14 Jul. 0.0379 0.0329 0.0357
01:01-02:00, Sun., 14 Jul. 0.0394 0.0340 0.0361
00:01-01:00, Sun., 14 Jul. 0.0382 0.0337 0.0359
23:01-24:00, Sat., 13 Jul. 0.0390 0.0340 0.0359
22:01-23:00, Sat., 13 Jul. 0.0385 0.0344 0.0362
21:01-22:00, Sat., 13 Jul. 0.0404 0.0346 0.0363