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., 14 Nov. 0.0400 0.0346 0.0366
07:01-08:00, Sat., 14 Nov. 0.0398 0.0350 0.0367
06:01-07:00, Sat., 14 Nov. 0.0393 0.0345 0.0366
05:01-06:00, Sat., 14 Nov. 0.0402 0.0352 0.0368
04:01-05:00, Sat., 14 Nov. 0.0398 0.0346 0.0366
03:01-04:00, Sat., 14 Nov. 0.0389 0.0339 0.0366
02:01-03:00, Sat., 14 Nov. 0.0402 0.0337 0.0368
01:01-02:00, Sat., 14 Nov. 0.0390 0.0348 0.0365
00:01-01:00, Sat., 14 Nov. 0.0389 0.0343 0.0365
23:01-24:00, Fri., 13 Nov. 0.0398 0.0343 0.0365
22:01-23:00, Fri., 13 Nov. 0.0401 0.0340 0.0366
21:01-22:00, Fri., 13 Nov. 0.0382 0.0352 0.0364
20:01-21:00, Fri., 13 Nov. 0.0381 0.0327 0.0358
19:01-20:00, Fri., 13 Nov. 0.0388 0.0341 0.0359
18:01-19:00, Fri., 13 Nov. 0.0395 0.0337 0.0362
17:01-18:00, Fri., 13 Nov. 0.0382 0.0343 0.0361
16:01-17:00, Fri., 13 Nov. 0.0402 0.0345 0.0362
15:01-16:00, Fri., 13 Nov. 0.0402 0.0342 0.0364
14:01-15:00, Fri., 13 Nov. 0.0378 0.0344 0.0359
13:01-14:00, Fri., 13 Nov. 0.0400 0.0336 0.0362
12:01-13:00, Fri., 13 Nov. 0.0412 0.0340 0.0364
11:01-12:00, Fri., 13 Nov. 0.0397 0.0346 0.0364
10:01-11:00, Fri., 13 Nov. 0.0399 0.0347 0.0367
09:01-10:00, Fri., 13 Nov. 0.0396 0.0343 0.0369
08:01-09:00, Fri., 13 Nov. 0.0399 0.0348 0.0369
07:01-08:00, Fri., 13 Nov. 0.0397 0.0343 0.0364
06:01-07:00, Fri., 13 Nov. 0.0402 0.0345 0.0366
05:01-06:00, Fri., 13 Nov. 0.0410 0.0345 0.0365
04:01-05:00, Fri., 13 Nov. 0.0406 0.0345 0.0364
03:01-04:00, Fri., 13 Nov. 0.0405 0.0334 0.0365
02:01-03:00, Fri., 13 Nov. 0.0397 0.0346 0.0366
01:01-02:00, Fri., 13 Nov. 0.0398 0.0343 0.0365
00:01-01:00, Fri., 13 Nov. 0.0387 0.0342 0.0363
23:01-24:00, Thu., 12 Nov. 0.0410 0.0343 0.0363
22:01-23:00, Thu., 12 Nov. 0.0396 0.0340 0.0362
21:01-22:00, Thu., 12 Nov. 0.0382 0.0336 0.0358
20:01-21:00, Thu., 12 Nov. 0.0370 0.0339 0.0356
19:01-20:00, Thu., 12 Nov. 0.0386 0.0336 0.0353
18:01-19:00, Thu., 12 Nov. 0.0377 0.0336 0.0355
17:01-18:00, Thu., 12 Nov. 0.0373 0.0332 0.0354
16:01-17:00, Thu., 12 Nov. 0.0390 0.0329 0.0354
15:01-16:00, Thu., 12 Nov. 0.0379 0.0334 0.0354
14:01-15:00, Thu., 12 Nov. 0.0390 0.0339 0.0356
13:01-14:00, Thu., 12 Nov. 0.0386 0.0333 0.0357
12:01-13:00, Thu., 12 Nov. 0.0387 0.0333 0.0357
11:01-12:00, Thu., 12 Nov. 0.0394 0.0339 0.0359
10:01-11:00, Thu., 12 Nov. 0.0380 0.0344 0.0359
09:01-10:00, Thu., 12 Nov. 0.0390 0.0330 0.0362
08:01-09:00, Thu., 12 Nov. 0.0383 0.0341 0.0359
07:01-08:00, Thu., 12 Nov. 0.0379 0.0342 0.0358
06:01-07:00, Thu., 12 Nov. 0.0374 0.0329 0.0357
05:01-06:00, Thu., 12 Nov. 0.0396 0.0342 0.0360
04:01-05:00, Thu., 12 Nov. 0.0381 0.0342 0.0361
03:01-04:00, Thu., 12 Nov. 0.0396 0.0339 0.0361
02:01-03:00, Thu., 12 Nov. 0.0386 0.0338 0.0359
01:01-02:00, Thu., 12 Nov. 0.0384 0.0334 0.0359
00:01-01:00, Thu., 12 Nov. 0.0390 0.0340 0.0360
23:01-24:00, Wed., 11 Nov. 0.0385 0.0337 0.0358
22:01-23:00, Wed., 11 Nov. 0.0381 0.0334 0.0354
21:01-22:00, Wed., 11 Nov. 0.0377 0.0326 0.0354
20:01-21:00, Wed., 11 Nov. 0.0369 0.0330 0.0353
19:01-20:00, Wed., 11 Nov. 0.0379 0.0330 0.0353
18:01-19:00, Wed., 11 Nov. 0.0374 0.0328 0.0352
17:01-18:00, Wed., 11 Nov. 0.0369 0.0331 0.0351
16:01-17:00, Wed., 11 Nov. 0.0369 0.0329 0.0350
15:01-16:00, Wed., 11 Nov. 0.0378 0.0331 0.0354
14:01-15:00, Wed., 11 Nov. 0.0371 0.0322 0.0350
13:01-14:00, Wed., 11 Nov. 0.0374 0.0329 0.0354
12:01-13:00, Wed., 11 Nov. 0.0391 0.0335 0.0355
11:01-12:00, Wed., 11 Nov. 0.0373 0.0329 0.0353
10:01-11:00, Wed., 11 Nov. 0.0370 0.0328 0.0354
09:01-10:00, Wed., 11 Nov. 0.0386 0.0326 0.0360
08:01-09:00, Wed., 11 Nov. 0.0374 0.0336 0.0359
07:01-08:00, Wed., 11 Nov. 0.0384 0.0326 0.0356
06:01-07:00, Wed., 11 Nov. 0.0377 0.0334 0.0355
05:01-06:00, Wed., 11 Nov. 0.0376 0.0333 0.0356
04:01-05:00, Wed., 11 Nov. 0.0373 0.0334 0.0353
03:01-04:00, Wed., 11 Nov. 0.0372 0.0323 0.0348
02:01-03:00, Wed., 11 Nov. 0.0383 0.0331 0.0350
01:01-02:00, Wed., 11 Nov. 0.0370 0.0329 0.0349
00:01-01:00, Wed., 11 Nov. 0.0374 0.0324 0.0348
23:01-24:00, Tue., 10 Nov. 0.0365 0.0327 0.0349
22:01-23:00, Tue., 10 Nov. 0.0369 0.0326 0.0348
21:01-22:00, Tue., 10 Nov. 0.0370 0.0328 0.0348
20:01-21:00, Tue., 10 Nov. 0.0366 0.0323 0.0350
19:01-20:00, Tue., 10 Nov. 0.0371 0.0329 0.0352
18:01-19:00, Tue., 10 Nov. 0.0365 0.0340 0.0352
17:01-18:00, Tue., 10 Nov. 0.0367 0.0335 0.0353
16:01-17:00, Tue., 10 Nov. 0.0371 0.0334 0.0353
15:01-16:00, Tue., 10 Nov. 0.0370 0.0338 0.0353
14:01-15:00, Tue., 10 Nov. 0.0378 0.0330 0.0353
13:01-14:00, Tue., 10 Nov. 0.0396 0.0338 0.0363
12:01-13:00, Tue., 10 Nov. 0.0431 0.0354 0.0389
11:01-12:00, Tue., 10 Nov. 0.0446 0.0383 0.0413
10:01-11:00, Tue., 10 Nov. 0.0421 0.0357 0.0387
09:01-10:00, Tue., 10 Nov. 0.0407 0.0346 0.0372
08:01-09:00, Tue., 10 Nov. 0.0441 0.0366 0.0402
07:01-08:00, Tue., 10 Nov. 0.0426 0.0355 0.0386
06:01-07:00, Tue., 10 Nov. 0.0410 0.0354 0.0374
05:01-06:00, Tue., 10 Nov. 0.0433 0.0364 0.0395
04:01-05:00, Tue., 10 Nov. 0.0466 0.0407 0.0433
03:01-04:00, Tue., 10 Nov. 0.0458 0.0388 0.0432
02:01-03:00, Tue., 10 Nov. 0.0493 0.0411 0.0441
01:01-02:00, Tue., 10 Nov. 0.0483 0.0393 0.0437
00:01-01:00, Tue., 10 Nov. 0.0446 0.0358 0.0393
23:01-24:00, Mon., 09 Nov. 0.0394 0.0344 0.0363
22:01-23:00, Mon., 09 Nov. 0.0370 0.0342 0.0355
21:01-22:00, Mon., 09 Nov. 0.0377 0.0329 0.0354
20:01-21:00, Mon., 09 Nov. 0.0369 0.0329 0.0353
19:01-20:00, Mon., 09 Nov. 0.0373 0.0333 0.0353
18:01-19:00, Mon., 09 Nov. 0.0381 0.0333 0.0356
17:01-18:00, Mon., 09 Nov. 0.0411 0.0340 0.0364
16:01-17:00, Mon., 09 Nov. 0.0420 0.0346 0.0367
15:01-16:00, Mon., 09 Nov. 0.0412 0.0342 0.0368
14:01-15:00, Mon., 09 Nov. 0.0441 0.0355 0.0385
13:01-14:00, Mon., 09 Nov. 0.0417 0.0345 0.0372
12:01-13:00, Mon., 09 Nov. 0.0439 0.0356 0.0396
11:01-12:00, Mon., 09 Nov. 0.0458 0.0376 0.0416
10:01-11:00, Mon., 09 Nov. 0.0441 0.0372 0.0408
09:01-10:00, Mon., 09 Nov. 0.0482 0.0388 0.0431
08:01-09:00, Mon., 09 Nov. 0.0483 0.0410 0.0453
07:01-08:00, Mon., 09 Nov. 0.0509 0.0437 0.0465
06:01-07:00, Mon., 09 Nov. 0.0473 0.0394 0.0428
05:01-06:00, Mon., 09 Nov. 0.0463 0.0382 0.0419
04:01-05:00, Mon., 09 Nov. 0.0438 0.0360 0.0404
03:01-04:00, Mon., 09 Nov. 0.0420 0.0354 0.0378
02:01-03:00, Mon., 09 Nov. 0.0388 0.0330 0.0355
01:01-02:00, Mon., 09 Nov. 0.0376 0.0323 0.0353
00:01-01:00, Mon., 09 Nov. 0.0378 0.0339 0.0358
23:01-24:00, Sun., 08 Nov. 0.0396 0.0331 0.0356
22:01-23:00, Sun., 08 Nov. 0.0377 0.0327 0.0354
21:01-22:00, Sun., 08 Nov. 0.0392 0.0328 0.0354
20:01-21:00, Sun., 08 Nov. 0.0388 0.0338 0.0358
19:01-20:00, Sun., 08 Nov. 0.0371 0.0330 0.0354
18:01-19:00, Sun., 08 Nov. 0.0369 0.0331 0.0352
17:01-18:00, Sun., 08 Nov. 0.0385 0.0334 0.0354
16:01-17:00, Sun., 08 Nov. 0.0404 0.0332 0.0352
15:01-16:00, Sun., 08 Nov. 0.0374 0.0328 0.0353
14:01-15:00, Sun., 08 Nov. 0.0374 0.0331 0.0352
13:01-14:00, Sun., 08 Nov. 0.0374 0.0336 0.0354
12:01-13:00, Sun., 08 Nov. 0.0371 0.0336 0.0356
11:01-12:00, Sun., 08 Nov. 0.0375 0.0335 0.0354
10:01-11:00, Sun., 08 Nov. 0.0373 0.0330 0.0352
09:01-10:00, Sun., 08 Nov. 0.0386 0.0337 0.0358
08:01-09:00, Sun., 08 Nov. 0.0402 0.0326 0.0359
07:01-08:00, Sun., 08 Nov. 0.0374 0.0338 0.0356
06:01-07:00, Sun., 08 Nov. 0.0383 0.0335 0.0356
05:01-06:00, Sun., 08 Nov. 0.0395 0.0336 0.0356
04:01-05:00, Sun., 08 Nov. 0.0379 0.0340 0.0356
03:01-04:00, Sun., 08 Nov. 0.0374 0.0340 0.0357
02:01-03:00, Sun., 08 Nov. 0.0375 0.0332 0.0355
01:01-02:00, Sun., 08 Nov. 0.0375 0.0336 0.0356
00:01-01:00, Sun., 08 Nov. 0.0369 0.0330 0.0352
23:01-24:00, Sat., 07 Nov. 0.0379 0.0338 0.0356
22:01-23:00, Sat., 07 Nov. 0.0383 0.0340 0.0358
21:01-22:00, Sat., 07 Nov. 0.0378 0.0337 0.0353
20:01-21:00, Sat., 07 Nov. 0.0375 0.0332 0.0354
19:01-20:00, Sat., 07 Nov. 0.0379 0.0341 0.0359
18:01-19:00, Sat., 07 Nov. 0.0379 0.0335 0.0355
17:01-18:00, Sat., 07 Nov. 0.0383 0.0335 0.0359
16:01-17:00, Sat., 07 Nov. 0.0388 0.0343 0.0362
15:01-16:00, Sat., 07 Nov. 0.0401 0.0337 0.0362
14:01-15:00, Sat., 07 Nov. 0.0380 0.0339 0.0359
13:01-14:00, Sat., 07 Nov. 0.0391 0.0332 0.0359
12:01-13:00, Sat., 07 Nov. 0.0397 0.0345 0.0363
11:01-12:00, Sat., 07 Nov. 0.0390 0.0335 0.0359
10:01-11:00, Sat., 07 Nov. 0.0385 0.0330 0.0358
09:01-10:00, Sat., 07 Nov. 0.0404 0.0335 0.0360
08:01-09:00, Sat., 07 Nov. 0.0379 0.0341 0.0361
07:01-08:00, Sat., 07 Nov. 0.0386 0.0340 0.0360
06:01-07:00, Sat., 07 Nov. 0.0383 0.0339 0.0360
05:01-06:00, Sat., 07 Nov. 0.0397 0.0339 0.0359
04:01-05:00, Sat., 07 Nov. 0.0393 0.0345 0.0364
03:01-04:00, Sat., 07 Nov. 0.0378 0.0340 0.0359
02:01-03:00, Sat., 07 Nov. 0.0390 0.0332 0.0359
01:01-02:00, Sat., 07 Nov. 0.0378 0.0329 0.0359
00:01-01:00, Sat., 07 Nov. 0.0385 0.0340 0.0359
23:01-24:00, Fri., 06 Nov. 0.0379 0.0347 0.0359
22:01-23:00, Fri., 06 Nov. 0.0390 0.0329 0.0358
21:01-22:00, Fri., 06 Nov. 0.0383 0.0335 0.0359
20:01-21:00, Fri., 06 Nov. 0.0380 0.0333 0.0353
19:01-20:00, Fri., 06 Nov. 0.0384 0.0335 0.0354
18:01-19:00, Fri., 06 Nov. 0.0385 0.0334 0.0357
17:01-18:00, Fri., 06 Nov. 0.0389 0.0346 0.0359
16:01-17:00, Fri., 06 Nov. 0.0400 0.0340 0.0360
15:01-16:00, Fri., 06 Nov. 0.0381 0.0333 0.0356
14:01-15:00, Fri., 06 Nov. 0.0382 0.0343 0.0359
13:01-14:00, Fri., 06 Nov. 0.0380 0.0340 0.0357
12:01-13:00, Fri., 06 Nov. 0.0377 0.0331 0.0356
11:01-12:00, Fri., 06 Nov. 0.0367 0.0349 0.0357
10:01-11:00, Fri., 06 Nov. 0.0395 0.0340 0.0359
09:01-10:00, Fri., 06 Nov. 0.0387 0.0341 0.0361
08:01-09:00, Fri., 06 Nov. 0.0373 0.0336 0.0360
07:01-08:00, Fri., 06 Nov. 0.0389 0.0342 0.0361
06:01-07:00, Fri., 06 Nov. 0.0385 0.0341 0.0361
05:01-06:00, Fri., 06 Nov. 0.0373 0.0340 0.0360
04:01-05:00, Fri., 06 Nov. 0.0406 0.0343 0.0358
03:01-04:00, Fri., 06 Nov. 0.0395 0.0339 0.0358
02:01-03:00, Fri., 06 Nov. 0.0375 0.0327 0.0355
01:01-02:00, Fri., 06 Nov. 0.0380 0.0334 0.0357
00:01-01:00, Fri., 06 Nov. 0.0370 0.0334 0.0355
23:01-24:00, Thu., 05 Nov. 0.0388 0.0339 0.0355
22:01-23:00, Thu., 05 Nov. 0.0399 0.0328 0.0355
21:01-22:00, Thu., 05 Nov. 0.0374 0.0335 0.0354
20:01-21:00, Thu., 05 Nov. 0.0371 0.0337 0.0355
19:01-20:00, Thu., 05 Nov. 0.0389 0.0332 0.0357
18:01-19:00, Thu., 05 Nov. 0.0373 0.0342 0.0359
17:01-18:00, Thu., 05 Nov. 0.0381 0.0331 0.0354
16:01-17:00, Thu., 05 Nov. 0.0396 0.0325 0.0352
15:01-16:00, Thu., 05 Nov. 0.0376 0.0329 0.0355
14:01-15:00, Thu., 05 Nov. 0.0392 0.0339 0.0360
13:01-14:00, Thu., 05 Nov. 0.0405 0.0352 0.0375
12:01-13:00, Thu., 05 Nov. 0.0433 0.0363 0.0387
11:01-12:00, Thu., 05 Nov. 0.0455 0.0380 0.0414
10:01-11:00, Thu., 05 Nov. 0.0442 0.0378 0.0410
09:01-10:00, Thu., 05 Nov. 0.0460 0.0368 0.0415
08:01-09:00, Thu., 05 Nov. 0.0471 0.0384 0.0425
07:01-08:00, Thu., 05 Nov. 0.0500 0.0418 0.0457
06:01-07:00, Thu., 05 Nov. 0.0533 0.0454 0.0493
05:01-06:00, Thu., 05 Nov. 0.0588 0.0496 0.0531
04:01-05:00, Thu., 05 Nov. 0.0621 0.0536 0.0573
03:01-04:00, Thu., 05 Nov. 0.0621 0.0520 0.0573
02:01-03:00, Thu., 05 Nov. 0.0606 0.0488 0.0552
01:01-02:00, Thu., 05 Nov. 0.0546 0.0468 0.0508
00:01-01:00, Thu., 05 Nov. 0.0549 0.0469 0.0510
23:01-24:00, Wed., 04 Nov. 0.0540 0.0433 0.0483
22:01-23:00, Wed., 04 Nov. 0.0620 0.0488 0.0553
21:01-22:00, Wed., 04 Nov. 0.0629 0.0556 0.0588
20:01-21:00, Wed., 04 Nov. 0.0633 0.0526 0.0570
19:01-20:00, Wed., 04 Nov. 0.0595 0.0477 0.0546
18:01-19:00, Wed., 04 Nov. 0.0569 0.0466 0.0526
17:01-18:00, Wed., 04 Nov. 0.0575 0.0479 0.0523
16:01-17:00, Wed., 04 Nov. 0.0545 0.0414 0.0462
15:01-16:00, Wed., 04 Nov. 0.0510 0.0425 0.0462
14:01-15:00, Wed., 04 Nov. 0.0508 0.0422 0.0454
13:01-14:00, Wed., 04 Nov. 0.0455 0.0366 0.0408
12:01-13:00, Wed., 04 Nov. 0.0446 0.0339 0.0383
11:01-12:00, Wed., 04 Nov. 0.0373 0.0340 0.0358
10:01-11:00, Wed., 04 Nov. 0.0395 0.0339 0.0359
09:01-10:00, Wed., 04 Nov. 0.0375 0.0332 0.0359