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
07:01-08:00, Sat., 22 Aug. 0.0377 0.0336 0.0358
06:01-07:00, Sat., 22 Aug. 0.0378 0.0340 0.0358
05:01-06:00, Sat., 22 Aug. 0.0381 0.0331 0.0359
04:01-05:00, Sat., 22 Aug. 0.0371 0.0333 0.0355
03:01-04:00, Sat., 22 Aug. 0.0381 0.0331 0.0356
02:01-03:00, Sat., 22 Aug. 0.0377 0.0338 0.0359
01:01-02:00, Sat., 22 Aug. 0.0406 0.0338 0.0364
00:01-01:00, Sat., 22 Aug. 0.0377 0.0334 0.0355
23:01-24:00, Fri., 21 Aug. 0.0377 0.0330 0.0357
22:01-23:00, Fri., 21 Aug. 0.0393 0.0346 0.0367
21:01-22:00, Fri., 21 Aug. 0.0448 0.0357 0.0394
20:01-21:00, Fri., 21 Aug. 0.0456 0.0376 0.0416
19:01-20:00, Fri., 21 Aug. 0.0384 0.0335 0.0355
18:01-19:00, Fri., 21 Aug. 0.0385 0.0335 0.0353
17:01-18:00, Fri., 21 Aug. 0.0385 0.0330 0.0355
16:01-17:00, Fri., 21 Aug. 0.0374 0.0335 0.0357
15:01-16:00, Fri., 21 Aug. 0.0382 0.0339 0.0359
14:01-15:00, Fri., 21 Aug. 0.0392 0.0340 0.0360
13:01-14:00, Fri., 21 Aug. 0.0379 0.0336 0.0357
12:01-13:00, Fri., 21 Aug. 0.0374 0.0337 0.0356
11:01-12:00, Fri., 21 Aug. 0.0370 0.0334 0.0354
10:01-11:00, Fri., 21 Aug. 0.0378 0.0330 0.0357
09:01-10:00, Fri., 21 Aug. 0.0387 0.0330 0.0355
08:01-09:00, Fri., 21 Aug. 0.0381 0.0332 0.0356
07:01-08:00, Fri., 21 Aug. 0.0383 0.0334 0.0354
06:01-07:00, Fri., 21 Aug. 0.0381 0.0327 0.0356
05:01-06:00, Fri., 21 Aug. 0.0376 0.0333 0.0356
04:01-05:00, Fri., 21 Aug. 0.0390 0.0326 0.0354
03:01-04:00, Fri., 21 Aug. 0.0376 0.0335 0.0354
02:01-03:00, Fri., 21 Aug. 0.0392 0.0336 0.0354
01:01-02:00, Fri., 21 Aug. 0.0375 0.0332 0.0353
00:01-01:00, Fri., 21 Aug. 0.0376 0.0337 0.0354
23:01-24:00, Thu., 20 Aug. 0.0376 0.0332 0.0357
22:01-23:00, Thu., 20 Aug. 0.0376 0.0335 0.0355
21:01-22:00, Thu., 20 Aug. 0.0379 0.0333 0.0354
20:01-21:00, Thu., 20 Aug. 0.0380 0.0332 0.0354
19:01-20:00, Thu., 20 Aug. 0.0368 0.0332 0.0353
18:01-19:00, Thu., 20 Aug. 0.0379 0.0334 0.0352
17:01-18:00, Thu., 20 Aug. 0.0390 0.0324 0.0353
16:01-17:00, Thu., 20 Aug. 0.0389 0.0330 0.0354
15:01-16:00, Thu., 20 Aug. 0.0372 0.0340 0.0355
14:01-15:00, Thu., 20 Aug. 0.0387 0.0329 0.0352
13:01-14:00, Thu., 20 Aug. 0.0376 0.0332 0.0351
12:01-13:00, Thu., 20 Aug. 0.0372 0.0332 0.0355
11:01-12:00, Thu., 20 Aug. 0.0379 0.0324 0.0352
10:01-11:00, Thu., 20 Aug. 0.0373 0.0340 0.0356
09:01-10:00, Thu., 20 Aug. 0.0383 0.0332 0.0352
08:01-09:00, Thu., 20 Aug. 0.0389 0.0334 0.0352
07:01-08:00, Thu., 20 Aug. 0.0388 0.0325 0.0352
06:01-07:00, Thu., 20 Aug. 0.0374 0.0332 0.0351
05:01-06:00, Thu., 20 Aug. 0.0365 0.0331 0.0351
04:01-05:00, Thu., 20 Aug. 0.0373 0.0337 0.0355
03:01-04:00, Thu., 20 Aug. 0.0374 0.0326 0.0352
02:01-03:00, Thu., 20 Aug. 0.0386 0.0326 0.0353
01:01-02:00, Thu., 20 Aug. 0.0385 0.0330 0.0353
00:01-01:00, Thu., 20 Aug. 0.0373 0.0323 0.0350
23:01-24:00, Wed., 19 Aug. 0.0374 0.0328 0.0353
22:01-23:00, Wed., 19 Aug. 0.0376 0.0332 0.0354
21:01-22:00, Wed., 19 Aug. 0.0372 0.0328 0.0351
20:01-21:00, Wed., 19 Aug. 0.0383 0.0333 0.0350
19:01-20:00, Wed., 19 Aug. 0.0374 0.0332 0.0353
18:01-19:00, Wed., 19 Aug. 0.0374 0.0333 0.0350
17:01-18:00, Wed., 19 Aug. 0.0374 0.0330 0.0353
16:01-17:00, Wed., 19 Aug. 0.0384 0.0327 0.0352
15:01-16:00, Wed., 19 Aug. 0.0383 0.0332 0.0352
14:01-15:00, Wed., 19 Aug. 0.0381 0.0331 0.0353
13:01-14:00, Wed., 19 Aug. 0.0387 0.0334 0.0352
12:01-13:00, Wed., 19 Aug. 0.0367 0.0316 0.0346
11:01-12:00, Wed., 19 Aug. 0.0377 0.0332 0.0353
10:01-11:00, Wed., 19 Aug. 0.0369 0.0334 0.0352
09:01-10:00, Wed., 19 Aug. 0.0378 0.0330 0.0356
08:01-09:00, Wed., 19 Aug. 0.0375 0.0336 0.0356
07:01-08:00, Wed., 19 Aug. 0.0379 0.0331 0.0357
06:01-07:00, Wed., 19 Aug. 0.0373 0.0331 0.0350
05:01-06:00, Wed., 19 Aug. 0.0388 0.0333 0.0355
04:01-05:00, Wed., 19 Aug. 0.0375 0.0331 0.0350
03:01-04:00, Wed., 19 Aug. 0.0368 0.0328 0.0349
02:01-03:00, Wed., 19 Aug. 0.0375 0.0334 0.0353
01:01-02:00, Wed., 19 Aug. 0.0377 0.0328 0.0352
00:01-01:00, Wed., 19 Aug. 0.0375 0.0329 0.0350
23:01-24:00, Tue., 18 Aug. 0.0374 0.0332 0.0353
22:01-23:00, Tue., 18 Aug. 0.0370 0.0329 0.0350
21:01-22:00, Tue., 18 Aug. 0.0384 0.0324 0.0351
20:01-21:00, Tue., 18 Aug. 0.0375 0.0329 0.0353
19:01-20:00, Tue., 18 Aug. 0.0367 0.0325 0.0350
18:01-19:00, Tue., 18 Aug. 0.0368 0.0327 0.0348
17:01-18:00, Tue., 18 Aug. 0.0373 0.0326 0.0350
16:01-17:00, Tue., 18 Aug. 0.0377 0.0334 0.0352
15:01-16:00, Tue., 18 Aug. 0.0375 0.0328 0.0352
14:01-15:00, Tue., 18 Aug. 0.0385 0.0326 0.0353
13:01-14:00, Tue., 18 Aug. 0.0374 0.0332 0.0351
12:01-13:00, Tue., 18 Aug. 0.0374 0.0330 0.0350
11:01-12:00, Tue., 18 Aug. 0.0369 0.0330 0.0348
10:01-11:00, Tue., 18 Aug. 0.0389 0.0324 0.0350
09:01-10:00, Tue., 18 Aug. 0.0373 0.0327 0.0352
08:01-09:00, Tue., 18 Aug. 0.0387 0.0335 0.0356
07:01-08:00, Tue., 18 Aug. 0.0370 0.0331 0.0354
06:01-07:00, Tue., 18 Aug. 0.0382 0.0338 0.0359
05:01-06:00, Tue., 18 Aug. 0.0378 0.0338 0.0354
04:01-05:00, Tue., 18 Aug. 0.0376 0.0325 0.0353
03:01-04:00, Tue., 18 Aug. 0.0372 0.0325 0.0350
02:01-03:00, Tue., 18 Aug. 0.0379 0.0334 0.0352
01:01-02:00, Tue., 18 Aug. 0.0367 0.0328 0.0351
00:01-01:00, Tue., 18 Aug. 0.0385 0.0331 0.0351
23:01-24:00, Mon., 17 Aug. 0.0370 0.0325 0.0352
22:01-23:00, Mon., 17 Aug. 0.0374 0.0320 0.0352
21:01-22:00, Mon., 17 Aug. 0.0369 0.0331 0.0349
20:01-21:00, Mon., 17 Aug. 0.0391 0.0330 0.0353
19:01-20:00, Mon., 17 Aug. 0.0387 0.0328 0.0350
18:01-19:00, Mon., 17 Aug. 0.0381 0.0327 0.0353
17:01-18:00, Mon., 17 Aug. 0.0368 0.0330 0.0348
16:01-17:00, Mon., 17 Aug. 0.0369 0.0328 0.0352
15:01-16:00, Mon., 17 Aug. 0.0369 0.0336 0.0353
14:01-15:00, Mon., 17 Aug. 0.0366 0.0322 0.0349
13:01-14:00, Mon., 17 Aug. 0.0375 0.0326 0.0348
12:01-13:00, Mon., 17 Aug. 0.0367 0.0328 0.0350
11:01-12:00, Mon., 17 Aug. 0.0370 0.0332 0.0350
10:01-11:00, Mon., 17 Aug. 0.0374 0.0326 0.0352
09:01-10:00, Mon., 17 Aug. 0.0365 0.0326 0.0351
08:01-09:00, Mon., 17 Aug. 0.0369 0.0330 0.0350
07:01-08:00, Mon., 17 Aug. 0.0367 0.0330 0.0351
06:01-07:00, Mon., 17 Aug. 0.0370 0.0323 0.0349
05:01-06:00, Mon., 17 Aug. 0.0371 0.0330 0.0351
04:01-05:00, Mon., 17 Aug. 0.0368 0.0328 0.0350
03:01-04:00, Mon., 17 Aug. 0.0371 0.0329 0.0350
02:01-03:00, Mon., 17 Aug. 0.0370 0.0324 0.0350
01:01-02:00, Mon., 17 Aug. 0.0380 0.0327 0.0350
00:01-01:00, Mon., 17 Aug. 0.0368 0.0325 0.0349
23:01-24:00, Sun., 16 Aug. 0.0375 0.0334 0.0351
22:01-23:00, Sun., 16 Aug. 0.0371 0.0329 0.0349
21:01-22:00, Sun., 16 Aug. 0.0363 0.0325 0.0345
20:01-21:00, Sun., 16 Aug. 0.0374 0.0321 0.0350
19:01-20:00, Sun., 16 Aug. 0.0370 0.0325 0.0350
18:01-19:00, Sun., 16 Aug. 0.0376 0.0334 0.0356
17:01-18:00, Sun., 16 Aug. 0.0407 0.0341 0.0364
16:01-17:00, Sun., 16 Aug. 0.0418 0.0350 0.0372
15:01-16:00, Sun., 16 Aug. 0.0416 0.0356 0.0384
14:01-15:00, Sun., 16 Aug. 0.0406 0.0343 0.0376
13:01-14:00, Sun., 16 Aug. 0.0394 0.0345 0.0361
12:01-13:00, Sun., 16 Aug. 0.0378 0.0332 0.0354
11:01-12:00, Sun., 16 Aug. 0.0370 0.0329 0.0351
10:01-11:00, Sun., 16 Aug. 0.0373 0.0327 0.0352
09:01-10:00, Sun., 16 Aug. 0.0403 0.0325 0.0353
08:01-09:00, Sun., 16 Aug. 0.0385 0.0329 0.0355
07:01-08:00, Sun., 16 Aug. 0.0367 0.0332 0.0350
06:01-07:00, Sun., 16 Aug. 0.0372 0.0329 0.0352
05:01-06:00, Sun., 16 Aug. 0.0374 0.0337 0.0354
04:01-05:00, Sun., 16 Aug. 0.0373 0.0331 0.0352
03:01-04:00, Sun., 16 Aug. 0.0373 0.0331 0.0353
02:01-03:00, Sun., 16 Aug. 0.0370 0.0329 0.0350
01:01-02:00, Sun., 16 Aug. 0.0375 0.0330 0.0351
00:01-01:00, Sun., 16 Aug. 0.0382 0.0332 0.0351
23:01-24:00, Sat., 15 Aug. 0.0368 0.0332 0.0350
22:01-23:00, Sat., 15 Aug. 0.0379 0.0326 0.0350
21:01-22:00, Sat., 15 Aug. 0.0368 0.0325 0.0349
20:01-21:00, Sat., 15 Aug. 0.0378 0.0326 0.0349
19:01-20:00, Sat., 15 Aug. 0.0376 0.0330 0.0349
18:01-19:00, Sat., 15 Aug. 0.0366 0.0327 0.0349
17:01-18:00, Sat., 15 Aug. 0.0372 0.0326 0.0352
16:01-17:00, Sat., 15 Aug. 0.0383 0.0335 0.0352
15:01-16:00, Sat., 15 Aug. 0.0373 0.0338 0.0353
14:01-15:00, Sat., 15 Aug. 0.0381 0.0337 0.0352
13:01-14:00, Sat., 15 Aug. 0.0372 0.0321 0.0351
12:01-13:00, Sat., 15 Aug. 0.0370 0.0335 0.0351
11:01-12:00, Sat., 15 Aug. 0.0366 0.0332 0.0351
10:01-11:00, Sat., 15 Aug. 0.0368 0.0332 0.0351
09:01-10:00, Sat., 15 Aug. 0.0392 0.0329 0.0349
08:01-09:00, Sat., 15 Aug. 0.0377 0.0327 0.0350
07:01-08:00, Sat., 15 Aug. 0.0399 0.0324 0.0352
06:01-07:00, Sat., 15 Aug. 0.0385 0.0332 0.0353
05:01-06:00, Sat., 15 Aug. 0.0376 0.0316 0.0351
04:01-05:00, Sat., 15 Aug. 0.0367 0.0328 0.0350
03:01-04:00, Sat., 15 Aug. 0.0383 0.0327 0.0352
02:01-03:00, Sat., 15 Aug. 0.0372 0.0330 0.0348
01:01-02:00, Sat., 15 Aug. 0.0378 0.0319 0.0351
00:01-01:00, Sat., 15 Aug. 0.0369 0.0328 0.0348
23:01-24:00, Fri., 14 Aug. 0.0392 0.0334 0.0353
22:01-23:00, Fri., 14 Aug. 0.0379 0.0322 0.0351
21:01-22:00, Fri., 14 Aug. 0.0368 0.0327 0.0349
20:01-21:00, Fri., 14 Aug. 0.0370 0.0334 0.0352
19:01-20:00, Fri., 14 Aug. 0.0371 0.0321 0.0350
18:01-19:00, Fri., 14 Aug. 0.0386 0.0335 0.0357
17:01-18:00, Fri., 14 Aug. 0.0375 0.0335 0.0355
16:01-17:00, Fri., 14 Aug. 0.0377 0.0324 0.0350
15:01-16:00, Fri., 14 Aug. 0.0375 0.0337 0.0352
14:01-15:00, Fri., 14 Aug. 0.0369 0.0330 0.0350
13:01-14:00, Fri., 14 Aug. 0.0372 0.0335 0.0350
12:01-13:00, Fri., 14 Aug. 0.0368 0.0330 0.0350
11:01-12:00, Fri., 14 Aug. 0.0370 0.0326 0.0352
10:01-11:00, Fri., 14 Aug. 0.0372 0.0332 0.0352
09:01-10:00, Fri., 14 Aug. 0.0368 0.0331 0.0352
08:01-09:00, Fri., 14 Aug. 0.0370 0.0331 0.0351
07:01-08:00, Fri., 14 Aug. 0.0370 0.0336 0.0352
06:01-07:00, Fri., 14 Aug. 0.0380 0.0334 0.0353
05:01-06:00, Fri., 14 Aug. 0.0384 0.0331 0.0354
04:01-05:00, Fri., 14 Aug. 0.0380 0.0341 0.0359
03:01-04:00, Fri., 14 Aug. 0.0388 0.0337 0.0360
02:01-03:00, Fri., 14 Aug. 0.0423 0.0349 0.0373
01:01-02:00, Fri., 14 Aug. 0.0431 0.0359 0.0398
00:01-01:00, Fri., 14 Aug. 0.0427 0.0361 0.0390
23:01-24:00, Thu., 13 Aug. 0.0413 0.0360 0.0383
22:01-23:00, Thu., 13 Aug. 0.0410 0.0356 0.0384
21:01-22:00, Thu., 13 Aug. 0.0417 0.0358 0.0385
20:01-21:00, Thu., 13 Aug. 0.0411 0.0355 0.0382
19:01-20:00, Thu., 13 Aug. 0.0404 0.0351 0.0370
18:01-19:00, Thu., 13 Aug. 0.0383 0.0332 0.0361
17:01-18:00, Thu., 13 Aug. 0.0392 0.0336 0.0359
16:01-17:00, Thu., 13 Aug. 0.0403 0.0346 0.0370
15:01-16:00, Thu., 13 Aug. 0.0432 0.0363 0.0398
14:01-15:00, Thu., 13 Aug. 0.0426 0.0339 0.0375
13:01-14:00, Thu., 13 Aug. 0.0384 0.0329 0.0354
12:01-13:00, Thu., 13 Aug. 0.0402 0.0326 0.0361
11:01-12:00, Thu., 13 Aug. 0.0398 0.0339 0.0361
10:01-11:00, Thu., 13 Aug. 0.0410 0.0348 0.0373
09:01-10:00, Thu., 13 Aug. 0.0405 0.0344 0.0368
08:01-09:00, Thu., 13 Aug. 0.0407 0.0333 0.0365
07:01-08:00, Thu., 13 Aug. 0.0401 0.0351 0.0373
06:01-07:00, Thu., 13 Aug. 0.0389 0.0336 0.0361
05:01-06:00, Thu., 13 Aug. 0.0371 0.0330 0.0350
04:01-05:00, Thu., 13 Aug. 0.0373 0.0325 0.0352
03:01-04:00, Thu., 13 Aug. 0.0376 0.0332 0.0354
02:01-03:00, Thu., 13 Aug. 0.0379 0.0332 0.0353
01:01-02:00, Thu., 13 Aug. 0.0370 0.0326 0.0351
00:01-01:00, Thu., 13 Aug. 0.0386 0.0332 0.0352
23:01-24:00, Wed., 12 Aug. 0.0369 0.0334 0.0352
22:01-23:00, Wed., 12 Aug. 0.0379 0.0325 0.0351
21:01-22:00, Wed., 12 Aug. 0.0372 0.0328 0.0350
20:01-21:00, Wed., 12 Aug. 0.0370 0.0335 0.0353
19:01-20:00, Wed., 12 Aug. 0.0384 0.0336 0.0355
18:01-19:00, Wed., 12 Aug. 0.0385 0.0327 0.0354
17:01-18:00, Wed., 12 Aug. 0.0368 0.0334 0.0351
16:01-17:00, Wed., 12 Aug. 0.0370 0.0333 0.0353
15:01-16:00, Wed., 12 Aug. 0.0377 0.0328 0.0353
14:01-15:00, Wed., 12 Aug. 0.0375 0.0329 0.0352
13:01-14:00, Wed., 12 Aug. 0.0379 0.0323 0.0353
12:01-13:00, Wed., 12 Aug. 0.0385 0.0338 0.0356
11:01-12:00, Wed., 12 Aug. 0.0390 0.0333 0.0354
10:01-11:00, Wed., 12 Aug. 0.0379 0.0329 0.0351
09:01-10:00, Wed., 12 Aug. 0.0370 0.0331 0.0351
08:01-09:00, Wed., 12 Aug. 0.0392 0.0343 0.0360