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
19:01-20:00, Sat., 01 Aug. 0.0462 0.0360 0.0403
18:01-19:00, Sat., 01 Aug. 0.0421 0.0348 0.0376
17:01-18:00, Sat., 01 Aug. 0.0398 0.0344 0.0366
16:01-17:00, Sat., 01 Aug. 0.0393 0.0341 0.0366
15:01-16:00, Sat., 01 Aug. 0.0389 0.0349 0.0368
14:01-15:00, Sat., 01 Aug. 0.0396 0.0347 0.0365
13:01-14:00, Sat., 01 Aug. 0.0399 0.0340 0.0367
12:01-13:00, Sat., 01 Aug. 0.0398 0.0344 0.0367
11:01-12:00, Sat., 01 Aug. 0.0395 0.0343 0.0368
10:01-11:00, Sat., 01 Aug. 0.0402 0.0349 0.0367
09:01-10:00, Sat., 01 Aug. 0.0393 0.0351 0.0367
08:01-09:00, Sat., 01 Aug. 0.0389 0.0345 0.0366
07:01-08:00, Sat., 01 Aug. 0.0404 0.0337 0.0367
06:01-07:00, Sat., 01 Aug. 0.0404 0.0346 0.0366
05:01-06:00, Sat., 01 Aug. 0.0429 0.0355 0.0378
04:01-05:00, Sat., 01 Aug. 0.0398 0.0344 0.0370
03:01-04:00, Sat., 01 Aug. 0.0392 0.0348 0.0366
02:01-03:00, Sat., 01 Aug. 0.0397 0.0338 0.0367
01:01-02:00, Sat., 01 Aug. 0.0392 0.0347 0.0366
00:01-01:00, Sat., 01 Aug. 0.0406 0.0350 0.0368
23:01-24:00, Fri., 31 Jul. 0.0397 0.0341 0.0365
22:01-23:00, Fri., 31 Jul. 0.0403 0.0343 0.0368
21:01-22:00, Fri., 31 Jul. 0.0395 0.0328 0.0364
20:01-21:00, Fri., 31 Jul. 0.0410 0.0344 0.0367
19:01-20:00, Fri., 31 Jul. 0.0400 0.0343 0.0369
18:01-19:00, Fri., 31 Jul. 0.0399 0.0350 0.0370
17:01-18:00, Fri., 31 Jul. 0.0401 0.0335 0.0365
16:01-17:00, Fri., 31 Jul. 0.0394 0.0341 0.0363
15:01-16:00, Fri., 31 Jul. 0.0412 0.0340 0.0368
14:01-15:00, Fri., 31 Jul. 0.0400 0.0345 0.0365
13:01-14:00, Fri., 31 Jul. 0.0400 0.0346 0.0365
12:01-13:00, Fri., 31 Jul. 0.0395 0.0349 0.0365
11:01-12:00, Fri., 31 Jul. 0.0401 0.0344 0.0369
10:01-11:00, Fri., 31 Jul. 0.0394 0.0346 0.0364
09:01-10:00, Fri., 31 Jul. 0.0386 0.0346 0.0368
08:01-09:00, Fri., 31 Jul. 0.0400 0.0342 0.0366
07:01-08:00, Fri., 31 Jul. 0.0394 0.0350 0.0367
06:01-07:00, Fri., 31 Jul. 0.0392 0.0343 0.0368
05:01-06:00, Fri., 31 Jul. 0.0399 0.0342 0.0366
04:01-05:00, Fri., 31 Jul. 0.0405 0.0348 0.0365
03:01-04:00, Fri., 31 Jul. 0.0400 0.0350 0.0368
02:01-03:00, Fri., 31 Jul. 0.0405 0.0346 0.0369
01:01-02:00, Fri., 31 Jul. 0.0390 0.0346 0.0366
00:01-01:00, Fri., 31 Jul. 0.0391 0.0343 0.0366
23:01-24:00, Thu., 30 Jul. 0.0400 0.0340 0.0365
22:01-23:00, Thu., 30 Jul. 0.0402 0.0351 0.0369
21:01-22:00, Thu., 30 Jul. 0.0397 0.0350 0.0368
20:01-21:00, Thu., 30 Jul. 0.0391 0.0352 0.0371
19:01-20:00, Thu., 30 Jul. 0.0422 0.0349 0.0382
18:01-19:00, Thu., 30 Jul. 0.0401 0.0346 0.0371
17:01-18:00, Thu., 30 Jul. 0.0395 0.0340 0.0366
16:01-17:00, Thu., 30 Jul. 0.0411 0.0346 0.0365
15:01-16:00, Thu., 30 Jul. 0.0399 0.0347 0.0364
14:01-15:00, Thu., 30 Jul. 0.0393 0.0344 0.0361
13:01-14:00, Thu., 30 Jul. 0.0391 0.0334 0.0367
12:01-13:00, Thu., 30 Jul. 0.0398 0.0347 0.0366
11:01-12:00, Thu., 30 Jul. 0.0398 0.0351 0.0368
10:01-11:00, Thu., 30 Jul. 0.0397 0.0336 0.0365
09:01-10:00, Thu., 30 Jul. 0.0396 0.0341 0.0366
08:01-09:00, Thu., 30 Jul. 0.0403 0.0349 0.0368
07:01-08:00, Thu., 30 Jul. 0.0404 0.0352 0.0370
06:01-07:00, Thu., 30 Jul. 0.0394 0.0345 0.0368
05:01-06:00, Thu., 30 Jul. 0.0406 0.0346 0.0373
04:01-05:00, Thu., 30 Jul. 0.0400 0.0347 0.0370
03:01-04:00, Thu., 30 Jul. 0.0392 0.0351 0.0370
02:01-03:00, Thu., 30 Jul. 0.0400 0.0341 0.0367
01:01-02:00, Thu., 30 Jul. 0.0404 0.0351 0.0368
00:01-01:00, Thu., 30 Jul. 0.0398 0.0341 0.0363
23:01-24:00, Wed., 29 Jul. 0.0389 0.0344 0.0365
22:01-23:00, Wed., 29 Jul. 0.0390 0.0344 0.0363
21:01-22:00, Wed., 29 Jul. 0.0387 0.0345 0.0361
20:01-21:00, Wed., 29 Jul. 0.0384 0.0346 0.0363
19:01-20:00, Wed., 29 Jul. 0.0381 0.0338 0.0361
18:01-19:00, Wed., 29 Jul. 0.0406 0.0348 0.0364
17:01-18:00, Wed., 29 Jul. 0.0382 0.0344 0.0361
16:01-17:00, Wed., 29 Jul. 0.0386 0.0338 0.0363
15:01-16:00, Wed., 29 Jul. 0.0380 0.0341 0.0361
14:01-15:00, Wed., 29 Jul. 0.0400 0.0336 0.0363
13:01-14:00, Wed., 29 Jul. 0.0388 0.0347 0.0364
12:01-13:00, Wed., 29 Jul. 0.0393 0.0345 0.0363
11:01-12:00, Wed., 29 Jul. 0.0401 0.0344 0.0364
10:01-11:00, Wed., 29 Jul. 0.0389 0.0336 0.0364
09:01-10:00, Wed., 29 Jul. 0.0412 0.0340 0.0365
08:01-09:00, Wed., 29 Jul. 0.0390 0.0348 0.0365
07:01-08:00, Wed., 29 Jul. 0.0395 0.0330 0.0364
06:01-07:00, Wed., 29 Jul. 0.0388 0.0347 0.0362
05:01-06:00, Wed., 29 Jul. 0.0391 0.0345 0.0362
04:01-05:00, Wed., 29 Jul. 0.0390 0.0348 0.0364
03:01-04:00, Wed., 29 Jul. 0.0405 0.0347 0.0365
02:01-03:00, Wed., 29 Jul. 0.0401 0.0339 0.0366
01:01-02:00, Wed., 29 Jul. 0.0395 0.0350 0.0367
00:01-01:00, Wed., 29 Jul. 0.0379 0.0338 0.0361
23:01-24:00, Tue., 28 Jul. 0.0387 0.0343 0.0362
22:01-23:00, Tue., 28 Jul. 0.0386 0.0340 0.0360
21:01-22:00, Tue., 28 Jul. 0.0391 0.0341 0.0363
20:01-21:00, Tue., 28 Jul. 0.0417 0.0348 0.0366
19:01-20:00, Tue., 28 Jul. 0.0421 0.0351 0.0370
18:01-19:00, Tue., 28 Jul. 0.0401 0.0348 0.0367
17:01-18:00, Tue., 28 Jul. 0.0451 0.0352 0.0402
16:01-17:00, Tue., 28 Jul. 0.0574 0.0404 0.0494
15:01-16:00, Tue., 28 Jul. 0.0610 0.0395 0.0505
14:01-15:00, Tue., 28 Jul. 0.0414 0.0344 0.0367
13:01-14:00, Tue., 28 Jul. 0.0386 0.0339 0.0357
12:01-13:00, Tue., 28 Jul. 0.0381 0.0338 0.0358
11:01-12:00, Tue., 28 Jul. 0.0380 0.0337 0.0357
10:01-11:00, Tue., 28 Jul. 0.0373 0.0331 0.0353
09:01-10:00, Tue., 28 Jul. 0.0381 0.0335 0.0358
08:01-09:00, Tue., 28 Jul. 0.0369 0.0333 0.0359
07:01-08:00, Tue., 28 Jul. 0.0388 0.0338 0.0358
06:01-07:00, Tue., 28 Jul. 0.0382 0.0339 0.0357
05:01-06:00, Tue., 28 Jul. 0.0386 0.0334 0.0359
04:01-05:00, Tue., 28 Jul. 0.0411 0.0350 0.0374
03:01-04:00, Tue., 28 Jul. 0.0446 0.0364 0.0404
02:01-03:00, Tue., 28 Jul. 0.0441 0.0341 0.0390
01:01-02:00, Tue., 28 Jul. 0.0392 0.0342 0.0361
00:01-01:00, Tue., 28 Jul. 0.0380 0.0337 0.0358
23:01-24:00, Mon., 27 Jul. 0.0386 0.0343 0.0359
22:01-23:00, Mon., 27 Jul. 0.0386 0.0340 0.0358
21:01-22:00, Mon., 27 Jul. 0.0390 0.0334 0.0356
20:01-21:00, Mon., 27 Jul. 0.0379 0.0334 0.0359
19:01-20:00, Mon., 27 Jul. 0.0380 0.0337 0.0358
18:01-19:00, Mon., 27 Jul. 0.0388 0.0333 0.0359
17:01-18:00, Mon., 27 Jul. 0.0378 0.0343 0.0360
16:01-17:00, Mon., 27 Jul. 0.0373 0.0339 0.0357
15:01-16:00, Mon., 27 Jul. 0.0389 0.0337 0.0358
14:01-15:00, Mon., 27 Jul. 0.0392 0.0337 0.0359
13:01-14:00, Mon., 27 Jul. 0.0378 0.0334 0.0358
12:01-13:00, Mon., 27 Jul. 0.0372 0.0343 0.0357
11:01-12:00, Mon., 27 Jul. 0.0396 0.0340 0.0363
10:01-11:00, Mon., 27 Jul. 0.0396 0.0344 0.0362
09:01-10:00, Mon., 27 Jul. 0.0388 0.0340 0.0362
08:01-09:00, Mon., 27 Jul. 0.0389 0.0345 0.0362
07:01-08:00, Mon., 27 Jul. 0.0380 0.0341 0.0359
06:01-07:00, Mon., 27 Jul. 0.0383 0.0342 0.0362
05:01-06:00, Mon., 27 Jul. 0.0396 0.0347 0.0365
04:01-05:00, Mon., 27 Jul. 0.0396 0.0336 0.0362
03:01-04:00, Mon., 27 Jul. 0.0386 0.0345 0.0360
02:01-03:00, Mon., 27 Jul. 0.0375 0.0348 0.0361
01:01-02:00, Mon., 27 Jul. 0.0383 0.0341 0.0360
00:01-01:00, Mon., 27 Jul. 0.0400 0.0344 0.0361
23:01-24:00, Sun., 26 Jul. 0.0385 0.0338 0.0361
22:01-23:00, Sun., 26 Jul. 0.0388 0.0340 0.0362
21:01-22:00, Sun., 26 Jul. 0.0400 0.0343 0.0364
20:01-21:00, Sun., 26 Jul. 0.0420 0.0343 0.0380
19:01-20:00, Sun., 26 Jul. 0.0436 0.0364 0.0394
18:01-19:00, Sun., 26 Jul. 0.0446 0.0350 0.0392
17:01-18:00, Sun., 26 Jul. 0.0404 0.0346 0.0366
16:01-17:00, Sun., 26 Jul. 0.0401 0.0344 0.0370
15:01-16:00, Sun., 26 Jul. 0.0451 0.0364 0.0404
14:01-15:00, Sun., 26 Jul. 0.0559 0.0438 0.0495
13:01-14:00, Sun., 26 Jul. 0.0537 0.0371 0.0437
12:01-13:00, Sun., 26 Jul. 0.0395 0.0341 0.0363
11:01-12:00, Sun., 26 Jul. 0.0377 0.0336 0.0359
10:01-11:00, Sun., 26 Jul. 0.0376 0.0324 0.0356
09:01-10:00, Sun., 26 Jul. 0.0390 0.0342 0.0360
08:01-09:00, Sun., 26 Jul. 0.0382 0.0337 0.0360
07:01-08:00, Sun., 26 Jul. 0.0391 0.0340 0.0360
06:01-07:00, Sun., 26 Jul. 0.0388 0.0337 0.0361
05:01-06:00, Sun., 26 Jul. 0.0387 0.0333 0.0360
04:01-05:00, Sun., 26 Jul. 0.0383 0.0343 0.0360
03:01-04:00, Sun., 26 Jul. 0.0396 0.0330 0.0355
02:01-03:00, Sun., 26 Jul. 0.0386 0.0338 0.0358
01:01-02:00, Sun., 26 Jul. 0.0376 0.0333 0.0357
00:01-01:00, Sun., 26 Jul. 0.0394 0.0333 0.0361
23:01-24:00, Sat., 25 Jul. 0.0390 0.0340 0.0360
22:01-23:00, Sat., 25 Jul. 0.0422 0.0337 0.0376
21:01-22:00, Sat., 25 Jul. 0.0453 0.0367 0.0412
20:01-21:00, Sat., 25 Jul. 0.0482 0.0348 0.0419
19:01-20:00, Sat., 25 Jul. 0.0385 0.0334 0.0359
18:01-19:00, Sat., 25 Jul. 0.0406 0.0339 0.0362
17:01-18:00, Sat., 25 Jul. 0.0407 0.0338 0.0360
16:01-17:00, Sat., 25 Jul. 0.0398 0.0339 0.0361
15:01-16:00, Sat., 25 Jul. 0.0385 0.0340 0.0363
14:01-15:00, Sat., 25 Jul. 0.0400 0.0333 0.0364
13:01-14:00, Sat., 25 Jul. 0.0395 0.0343 0.0364
12:01-13:00, Sat., 25 Jul. 0.0407 0.0341 0.0365
11:01-12:00, Sat., 25 Jul. 0.0407 0.0342 0.0364
10:01-11:00, Sat., 25 Jul. 0.0400 0.0347 0.0364
09:01-10:00, Sat., 25 Jul. 0.0403 0.0347 0.0365
08:01-09:00, Sat., 25 Jul. 0.0392 0.0342 0.0360
07:01-08:00, Sat., 25 Jul. 0.0392 0.0340 0.0361
06:01-07:00, Sat., 25 Jul. 0.0403 0.0344 0.0363
05:01-06:00, Sat., 25 Jul. 0.0377 0.0341 0.0362
04:01-05:00, Sat., 25 Jul. 0.0401 0.0339 0.0363
03:01-04:00, Sat., 25 Jul. 0.0390 0.0343 0.0362
02:01-03:00, Sat., 25 Jul. 0.0391 0.0340 0.0363
01:01-02:00, Sat., 25 Jul. 0.0405 0.0341 0.0364
00:01-01:00, Sat., 25 Jul. 0.0381 0.0334 0.0360
23:01-24:00, Fri., 24 Jul. 0.0389 0.0334 0.0358
22:01-23:00, Fri., 24 Jul. 0.0386 0.0338 0.0359
21:01-22:00, Fri., 24 Jul. 0.0384 0.0333 0.0361
20:01-21:00, Fri., 24 Jul. 0.0403 0.0338 0.0361
19:01-20:00, Fri., 24 Jul. 0.0395 0.0346 0.0370
18:01-19:00, Fri., 24 Jul. 0.0405 0.0347 0.0369
17:01-18:00, Fri., 24 Jul. 0.0422 0.0362 0.0385
16:01-17:00, Fri., 24 Jul. 0.0426 0.0337 0.0372
15:01-16:00, Fri., 24 Jul. 0.0391 0.0336 0.0360
14:01-15:00, Fri., 24 Jul. 0.0388 0.0341 0.0362
13:01-14:00, Fri., 24 Jul. 0.0388 0.0342 0.0362
12:01-13:00, Fri., 24 Jul. 0.0385 0.0344 0.0361
11:01-12:00, Fri., 24 Jul. 0.0389 0.0337 0.0361
10:01-11:00, Fri., 24 Jul. 0.0390 0.0342 0.0358
09:01-10:00, Fri., 24 Jul. 0.0390 0.0337 0.0361
08:01-09:00, Fri., 24 Jul. 0.0402 0.0343 0.0363
07:01-08:00, Fri., 24 Jul. 0.0389 0.0343 0.0361
06:01-07:00, Fri., 24 Jul. 0.0391 0.0340 0.0361
05:01-06:00, Fri., 24 Jul. 0.0395 0.0335 0.0361
04:01-05:00, Fri., 24 Jul. 0.0392 0.0342 0.0362
03:01-04:00, Fri., 24 Jul. 0.0383 0.0344 0.0362
02:01-03:00, Fri., 24 Jul. 0.0392 0.0343 0.0364
01:01-02:00, Fri., 24 Jul. 0.0376 0.0344 0.0362
00:01-01:00, Fri., 24 Jul. 0.0377 0.0346 0.0361
23:01-24:00, Thu., 23 Jul. 0.0398 0.0346 0.0363
22:01-23:00, Thu., 23 Jul. 0.0412 0.0342 0.0362
21:01-22:00, Thu., 23 Jul. 0.0390 0.0344 0.0363
20:01-21:00, Thu., 23 Jul. 0.0391 0.0339 0.0360
19:01-20:00, Thu., 23 Jul. 0.0382 0.0343 0.0360
18:01-19:00, Thu., 23 Jul. 0.0387 0.0338 0.0362
17:01-18:00, Thu., 23 Jul. 0.0382 0.0342 0.0361
16:01-17:00, Thu., 23 Jul. 0.0408 0.0334 0.0363
15:01-16:00, Thu., 23 Jul. 0.0396 0.0344 0.0361
14:01-15:00, Thu., 23 Jul. 0.0392 0.0339 0.0361
13:01-14:00, Thu., 23 Jul. 0.0386 0.0337 0.0359
12:01-13:00, Thu., 23 Jul. 0.0400 0.0347 0.0365
11:01-12:00, Thu., 23 Jul. 0.0392 0.0341 0.0364
10:01-11:00, Thu., 23 Jul. 0.0397 0.0342 0.0365
09:01-10:00, Thu., 23 Jul. 0.0404 0.0343 0.0365
08:01-09:00, Thu., 23 Jul. 0.0404 0.0350 0.0365
07:01-08:00, Thu., 23 Jul. 0.0401 0.0345 0.0370
06:01-07:00, Thu., 23 Jul. 0.0397 0.0348 0.0364
05:01-06:00, Thu., 23 Jul. 0.0400 0.0347 0.0364
04:01-05:00, Thu., 23 Jul. 0.0385 0.0343 0.0363
03:01-04:00, Thu., 23 Jul. 0.0385 0.0344 0.0365
02:01-03:00, Thu., 23 Jul. 0.0384 0.0344 0.0363
01:01-02:00, Thu., 23 Jul. 0.0403 0.0344 0.0365
00:01-01:00, Thu., 23 Jul. 0.0397 0.0349 0.0366
23:01-24:00, Wed., 22 Jul. 0.0402 0.0345 0.0368
22:01-23:00, Wed., 22 Jul. 0.0395 0.0343 0.0367
21:01-22:00, Wed., 22 Jul. 0.0397 0.0352 0.0365
20:01-21:00, Wed., 22 Jul. 0.0386 0.0341 0.0364