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., 26 Jul. 0.0371 0.0329 0.0354
18:01-19:00, Sat., 26 Jul. 0.0382 0.0334 0.0356
17:01-18:00, Sat., 26 Jul. 0.0382 0.0331 0.0353
16:01-17:00, Sat., 26 Jul. 0.0372 0.0329 0.0353
15:01-16:00, Sat., 26 Jul. 0.0370 0.0334 0.0354
14:01-15:00, Sat., 26 Jul. 0.0373 0.0337 0.0354
13:01-14:00, Sat., 26 Jul. 0.0386 0.0332 0.0354
12:01-13:00, Sat., 26 Jul. 0.0376 0.0335 0.0354
11:01-12:00, Sat., 26 Jul. 0.0382 0.0339 0.0359
10:01-11:00, Sat., 26 Jul. 0.0387 0.0346 0.0362
09:01-10:00, Sat., 26 Jul. 0.0389 0.0349 0.0364
08:01-09:00, Sat., 26 Jul. 0.0392 0.0343 0.0366
07:01-08:00, Sat., 26 Jul. 0.0396 0.0350 0.0366
06:01-07:00, Sat., 26 Jul. 0.0382 0.0336 0.0360
05:01-06:00, Sat., 26 Jul. 0.0382 0.0326 0.0354
04:01-05:00, Sat., 26 Jul. 0.0379 0.0339 0.0357
03:01-04:00, Sat., 26 Jul. 0.0382 0.0328 0.0353
02:01-03:00, Sat., 26 Jul. 0.0379 0.0331 0.0355
01:01-02:00, Sat., 26 Jul. 0.0381 0.0332 0.0354
00:01-01:00, Sat., 26 Jul. 0.0393 0.0333 0.0355
23:01-24:00, Fri., 25 Jul. 0.0373 0.0336 0.0356
22:01-23:00, Fri., 25 Jul. 0.0375 0.0330 0.0353
21:01-22:00, Fri., 25 Jul. 0.0376 0.0328 0.0351
20:01-21:00, Fri., 25 Jul. 0.0370 0.0329 0.0350
19:01-20:00, Fri., 25 Jul. 0.0375 0.0333 0.0354
18:01-19:00, Fri., 25 Jul. 0.0384 0.0330 0.0358
17:01-18:00, Fri., 25 Jul. 0.0377 0.0333 0.0354
16:01-17:00, Fri., 25 Jul. 0.0370 0.0333 0.0352
15:01-16:00, Fri., 25 Jul. 0.0378 0.0332 0.0353
14:01-15:00, Fri., 25 Jul. 0.0371 0.0335 0.0354
13:01-14:00, Fri., 25 Jul. 0.0395 0.0321 0.0354
12:01-13:00, Fri., 25 Jul. 0.0379 0.0341 0.0357
11:01-12:00, Fri., 25 Jul. 0.0392 0.0328 0.0360
10:01-11:00, Fri., 25 Jul. 0.0387 0.0341 0.0359
09:01-10:00, Fri., 25 Jul. 0.0388 0.0340 0.0359
08:01-09:00, Fri., 25 Jul. 0.0398 0.0339 0.0360
07:01-08:00, Fri., 25 Jul. 0.0384 0.0348 0.0364
06:01-07:00, Fri., 25 Jul. 0.0394 0.0341 0.0364
05:01-06:00, Fri., 25 Jul. 0.0402 0.0332 0.0360
04:01-05:00, Fri., 25 Jul. 0.0374 0.0341 0.0361
03:01-04:00, Fri., 25 Jul. 0.0404 0.0335 0.0357
02:01-03:00, Fri., 25 Jul. 0.0372 0.0341 0.0355
01:01-02:00, Fri., 25 Jul. 0.0381 0.0332 0.0353
00:01-01:00, Fri., 25 Jul. 0.0389 0.0329 0.0351
23:01-24:00, Thu., 24 Jul. 0.0380 0.0335 0.0354
22:01-23:00, Thu., 24 Jul. 0.0390 0.0326 0.0352
21:01-22:00, Thu., 24 Jul. 0.0371 0.0328 0.0353
20:01-21:00, Thu., 24 Jul. 0.0386 0.0337 0.0356
19:01-20:00, Thu., 24 Jul. 0.0384 0.0334 0.0354
18:01-19:00, Thu., 24 Jul. 0.0371 0.0336 0.0355
17:01-18:00, Thu., 24 Jul. 0.0371 0.0334 0.0354
16:01-17:00, Thu., 24 Jul. 0.0371 0.0329 0.0352
15:01-16:00, Thu., 24 Jul. 0.0374 0.0332 0.0354
14:01-15:00, Thu., 24 Jul. 0.0376 0.0336 0.0354
13:01-14:00, Thu., 24 Jul. 0.0376 0.0325 0.0354
12:01-13:00, Thu., 24 Jul. 0.0382 0.0336 0.0359
11:01-12:00, Thu., 24 Jul. 0.0377 0.0337 0.0357
10:01-11:00, Thu., 24 Jul. 0.0377 0.0334 0.0359
09:01-10:00, Thu., 24 Jul. 0.0379 0.0341 0.0356
08:01-09:00, Thu., 24 Jul. 0.0390 0.0332 0.0361
07:01-08:00, Thu., 24 Jul. 0.0384 0.0336 0.0356
06:01-07:00, Thu., 24 Jul. 0.0378 0.0333 0.0358
05:01-06:00, Thu., 24 Jul. 0.0369 0.0334 0.0354
04:01-05:00, Thu., 24 Jul. 0.0380 0.0332 0.0357
03:01-04:00, Thu., 24 Jul. 0.0373 0.0333 0.0355
02:01-03:00, Thu., 24 Jul. 0.0378 0.0325 0.0354
01:01-02:00, Thu., 24 Jul. 0.0394 0.0325 0.0353
00:01-01:00, Thu., 24 Jul. 0.0373 0.0335 0.0356
23:01-24:00, Wed., 23 Jul. 0.0380 0.0338 0.0354
22:01-23:00, Wed., 23 Jul. 0.0381 0.0332 0.0352
21:01-22:00, Wed., 23 Jul. 0.0380 0.0325 0.0351
20:01-21:00, Wed., 23 Jul. 0.0374 0.0336 0.0354
19:01-20:00, Wed., 23 Jul. 0.0392 0.0328 0.0353
18:01-19:00, Wed., 23 Jul. 0.0382 0.0322 0.0353
17:01-18:00, Wed., 23 Jul. 0.0369 0.0329 0.0351
16:01-17:00, Wed., 23 Jul. 0.0379 0.0332 0.0357
15:01-16:00, Wed., 23 Jul. 0.0372 0.0332 0.0351
14:01-15:00, Wed., 23 Jul. 0.0382 0.0337 0.0352
13:01-14:00, Wed., 23 Jul. 0.0372 0.0323 0.0354
12:01-13:00, Wed., 23 Jul. 0.0378 0.0340 0.0355
11:01-12:00, Wed., 23 Jul. 0.0394 0.0331 0.0355
10:01-11:00, Wed., 23 Jul. 0.0368 0.0333 0.0354
09:01-10:00, Wed., 23 Jul. 0.0392 0.0329 0.0357
08:01-09:00, Wed., 23 Jul. 0.0392 0.0327 0.0356
07:01-08:00, Wed., 23 Jul. 0.0380 0.0333 0.0355
06:01-07:00, Wed., 23 Jul. 0.0385 0.0334 0.0354
05:01-06:00, Wed., 23 Jul. 0.0387 0.0328 0.0354
04:01-05:00, Wed., 23 Jul. 0.0371 0.0330 0.0353
03:01-04:00, Wed., 23 Jul. 0.0375 0.0333 0.0354
02:01-03:00, Wed., 23 Jul. 0.0372 0.0322 0.0352
01:01-02:00, Wed., 23 Jul. 0.0373 0.0328 0.0351
00:01-01:00, Wed., 23 Jul. 0.0376 0.0327 0.0352
23:01-24:00, Tue., 22 Jul. 0.0394 0.0336 0.0354
22:01-23:00, Tue., 22 Jul. 0.0377 0.0333 0.0354
21:01-22:00, Tue., 22 Jul. 0.0374 0.0330 0.0351
20:01-21:00, Tue., 22 Jul. 0.0370 0.0328 0.0352
19:01-20:00, Tue., 22 Jul. 0.0383 0.0329 0.0352
18:01-19:00, Tue., 22 Jul. 0.0373 0.0327 0.0349
17:01-18:00, Tue., 22 Jul. 0.0375 0.0332 0.0351
16:01-17:00, Tue., 22 Jul. 0.0372 0.0327 0.0353
15:01-16:00, Tue., 22 Jul. 0.0372 0.0319 0.0349
14:01-15:00, Tue., 22 Jul. 0.0381 0.0333 0.0353
13:01-14:00, Tue., 22 Jul. 0.0374 0.0332 0.0354
12:01-13:00, Tue., 22 Jul. 0.0369 0.0332 0.0353
11:01-12:00, Tue., 22 Jul. 0.0384 0.0334 0.0352
10:01-11:00, Tue., 22 Jul. 0.0381 0.0330 0.0355
09:01-10:00, Tue., 22 Jul. 0.0378 0.0333 0.0354
08:01-09:00, Tue., 22 Jul. 0.0374 0.0335 0.0357
07:01-08:00, Tue., 22 Jul. 0.0377 0.0336 0.0356
06:01-07:00, Tue., 22 Jul. 0.0389 0.0334 0.0355
05:01-06:00, Tue., 22 Jul. 0.0383 0.0326 0.0351
04:01-05:00, Tue., 22 Jul. 0.0380 0.0335 0.0353
03:01-04:00, Tue., 22 Jul. 0.0376 0.0329 0.0352
02:01-03:00, Tue., 22 Jul. 0.0379 0.0320 0.0352
01:01-02:00, Tue., 22 Jul. 0.0385 0.0333 0.0352
00:01-01:00, Tue., 22 Jul. 0.0371 0.0329 0.0352
23:01-24:00, Mon., 21 Jul. 0.0381 0.0332 0.0353
22:01-23:00, Mon., 21 Jul. 0.0372 0.0332 0.0349
21:01-22:00, Mon., 21 Jul. 0.0370 0.0327 0.0350
20:01-21:00, Mon., 21 Jul. 0.0371 0.0320 0.0351
19:01-20:00, Mon., 21 Jul. 0.0368 0.0331 0.0351
18:01-19:00, Mon., 21 Jul. 0.0371 0.0324 0.0350
17:01-18:00, Mon., 21 Jul. 0.0378 0.0333 0.0350
16:01-17:00, Mon., 21 Jul. 0.0369 0.0323 0.0350
15:01-16:00, Mon., 21 Jul. 0.0372 0.0334 0.0353
14:01-15:00, Mon., 21 Jul. 0.0369 0.0326 0.0351
13:01-14:00, Mon., 21 Jul. 0.0369 0.0324 0.0351
12:01-13:00, Mon., 21 Jul. 0.0376 0.0336 0.0354
11:01-12:00, Mon., 21 Jul. 0.0372 0.0331 0.0354
10:01-11:00, Mon., 21 Jul. 0.0366 0.0324 0.0350
09:01-10:00, Mon., 21 Jul. 0.0370 0.0337 0.0354
08:01-09:00, Mon., 21 Jul. 0.0373 0.0326 0.0353
07:01-08:00, Mon., 21 Jul. 0.0381 0.0333 0.0353
06:01-07:00, Mon., 21 Jul. 0.0374 0.0328 0.0352
05:01-06:00, Mon., 21 Jul. 0.0370 0.0328 0.0351
04:01-05:00, Mon., 21 Jul. 0.0376 0.0330 0.0351
03:01-04:00, Mon., 21 Jul. 0.0381 0.0331 0.0352
02:01-03:00, Mon., 21 Jul. 0.0365 0.0331 0.0349
01:01-02:00, Mon., 21 Jul. 0.0374 0.0325 0.0351
00:01-01:00, Mon., 21 Jul. 0.0374 0.0324 0.0351
23:01-24:00, Sun., 20 Jul. 0.0369 0.0328 0.0351
22:01-23:00, Sun., 20 Jul. 0.0367 0.0327 0.0349
21:01-22:00, Sun., 20 Jul. 0.0367 0.0333 0.0351
20:01-21:00, Sun., 20 Jul. 0.0367 0.0321 0.0349
19:01-20:00, Sun., 20 Jul. 0.0370 0.0336 0.0352
18:01-19:00, Sun., 20 Jul. 0.0370 0.0325 0.0351
17:01-18:00, Sun., 20 Jul. 0.0375 0.0333 0.0352
16:01-17:00, Sun., 20 Jul. 0.0368 0.0320 0.0350
15:01-16:00, Sun., 20 Jul. 0.0369 0.0327 0.0349
14:01-15:00, Sun., 20 Jul. 0.0369 0.0323 0.0348
13:01-14:00, Sun., 20 Jul. 0.0386 0.0331 0.0351
12:01-13:00, Sun., 20 Jul. 0.0370 0.0331 0.0351
11:01-12:00, Sun., 20 Jul. 0.0386 0.0330 0.0352
10:01-11:00, Sun., 20 Jul. 0.0367 0.0333 0.0349
09:01-10:00, Sun., 20 Jul. 0.0369 0.0328 0.0347
08:01-09:00, Sun., 20 Jul. 0.0370 0.0328 0.0347
07:01-08:00, Sun., 20 Jul. 0.0364 0.0333 0.0349
06:01-07:00, Sun., 20 Jul. 0.0372 0.0329 0.0353
05:01-06:00, Sun., 20 Jul. 0.0379 0.0331 0.0351
04:01-05:00, Sun., 20 Jul. 0.0370 0.0326 0.0349
03:01-04:00, Sun., 20 Jul. 0.0368 0.0320 0.0348
02:01-03:00, Sun., 20 Jul. 0.0373 0.0320 0.0349
01:01-02:00, Sun., 20 Jul. 0.0366 0.0325 0.0348
00:01-01:00, Sun., 20 Jul. 0.0369 0.0328 0.0350
23:01-24:00, Sat., 19 Jul. 0.0374 0.0323 0.0351
22:01-23:00, Sat., 19 Jul. 0.0375 0.0322 0.0347
21:01-22:00, Sat., 19 Jul. 0.0371 0.0330 0.0349
20:01-21:00, Sat., 19 Jul. 0.0366 0.0328 0.0349
19:01-20:00, Sat., 19 Jul. 0.0367 0.0330 0.0351
18:01-19:00, Sat., 19 Jul. 0.0384 0.0331 0.0351
17:01-18:00, Sat., 19 Jul. 0.0365 0.0326 0.0347
16:01-17:00, Sat., 19 Jul. 0.0394 0.0332 0.0349
15:01-16:00, Sat., 19 Jul. 0.0370 0.0331 0.0349
14:01-15:00, Sat., 19 Jul. 0.0369 0.0327 0.0347
13:01-14:00, Sat., 19 Jul. 0.0372 0.0323 0.0348
12:01-13:00, Sat., 19 Jul. 0.0368 0.0331 0.0351
11:01-12:00, Sat., 19 Jul. 0.0373 0.0320 0.0347
10:01-11:00, Sat., 19 Jul. 0.0369 0.0328 0.0347
09:01-10:00, Sat., 19 Jul. 0.0369 0.0325 0.0345
08:01-09:00, Sat., 19 Jul. 0.0366 0.0326 0.0348
07:01-08:00, Sat., 19 Jul. 0.0363 0.0326 0.0347
06:01-07:00, Sat., 19 Jul. 0.0370 0.0326 0.0349
05:01-06:00, Sat., 19 Jul. 0.0370 0.0332 0.0348
04:01-05:00, Sat., 19 Jul. 0.0367 0.0322 0.0349
03:01-04:00, Sat., 19 Jul. 0.0373 0.0330 0.0349
02:01-03:00, Sat., 19 Jul. 0.0374 0.0327 0.0346
01:01-02:00, Sat., 19 Jul. 0.0374 0.0323 0.0347
00:01-01:00, Sat., 19 Jul. 0.0364 0.0325 0.0345
23:01-24:00, Fri., 18 Jul. 0.0368 0.0319 0.0346
22:01-23:00, Fri., 18 Jul. 0.0374 0.0329 0.0350
21:01-22:00, Fri., 18 Jul. 0.0393 0.0331 0.0349
20:01-21:00, Fri., 18 Jul. 0.0368 0.0328 0.0349
19:01-20:00, Fri., 18 Jul. 0.0374 0.0327 0.0347
18:01-19:00, Fri., 18 Jul. 0.0369 0.0328 0.0347
17:01-18:00, Fri., 18 Jul. 0.0377 0.0323 0.0347
16:01-17:00, Fri., 18 Jul. 0.0368 0.0328 0.0349
15:01-16:00, Fri., 18 Jul. 0.0371 0.0328 0.0347
14:01-15:00, Fri., 18 Jul. 0.0368 0.0322 0.0348
13:01-14:00, Fri., 18 Jul. 0.0367 0.0317 0.0343
12:01-13:00, Fri., 18 Jul. 0.0374 0.0326 0.0344
11:01-12:00, Fri., 18 Jul. 0.0370 0.0322 0.0345
10:01-11:00, Fri., 18 Jul. 0.0367 0.0326 0.0348
09:01-10:00, Fri., 18 Jul. 0.0371 0.0327 0.0346
08:01-09:00, Fri., 18 Jul. 0.0360 0.0328 0.0344
07:01-08:00, Fri., 18 Jul. 0.0361 0.0322 0.0345
06:01-07:00, Fri., 18 Jul. 0.0377 0.0334 0.0349
05:01-06:00, Fri., 18 Jul. 0.0368 0.0324 0.0347
04:01-05:00, Fri., 18 Jul. 0.0367 0.0325 0.0346
03:01-04:00, Fri., 18 Jul. 0.0365 0.0328 0.0346
02:01-03:00, Fri., 18 Jul. 0.0364 0.0327 0.0346
01:01-02:00, Fri., 18 Jul. 0.0367 0.0320 0.0345
00:01-01:00, Fri., 18 Jul. 0.0366 0.0324 0.0346
23:01-24:00, Thu., 17 Jul. 0.0369 0.0317 0.0347
22:01-23:00, Thu., 17 Jul. 0.0363 0.0327 0.0345
21:01-22:00, Thu., 17 Jul. 0.0369 0.0329 0.0346
20:01-21:00, Thu., 17 Jul. 0.0370 0.0328 0.0348
19:01-20:00, Thu., 17 Jul. 0.0359 0.0322 0.0344
18:01-19:00, Thu., 17 Jul. 0.0364 0.0325 0.0345
17:01-18:00, Thu., 17 Jul. 0.0367 0.0322 0.0345
16:01-17:00, Thu., 17 Jul. 0.0367 0.0325 0.0345
15:01-16:00, Thu., 17 Jul. 0.0370 0.0324 0.0344
14:01-15:00, Thu., 17 Jul. 0.0364 0.0328 0.0347
13:01-14:00, Thu., 17 Jul. 0.0370 0.0317 0.0341
12:01-13:00, Thu., 17 Jul. 0.0368 0.0324 0.0345
11:01-12:00, Thu., 17 Jul. 0.0363 0.0315 0.0341
10:01-11:00, Thu., 17 Jul. 0.0371 0.0320 0.0344
09:01-10:00, Thu., 17 Jul. 0.0364 0.0328 0.0343
08:01-09:00, Thu., 17 Jul. 0.0366 0.0324 0.0342
07:01-08:00, Thu., 17 Jul. 0.0364 0.0322 0.0344
06:01-07:00, Thu., 17 Jul. 0.0363 0.0317 0.0343
05:01-06:00, Thu., 17 Jul. 0.0364 0.0323 0.0342
04:01-05:00, Thu., 17 Jul. 0.0366 0.0325 0.0345
03:01-04:00, Thu., 17 Jul. 0.0367 0.0320 0.0347
02:01-03:00, Thu., 17 Jul. 0.0367 0.0322 0.0343
01:01-02:00, Thu., 17 Jul. 0.0361 0.0324 0.0343
00:01-01:00, Thu., 17 Jul. 0.0366 0.0321 0.0348
23:01-24:00, Wed., 16 Jul. 0.0370 0.0323 0.0348
22:01-23:00, Wed., 16 Jul. 0.0368 0.0323 0.0345
21:01-22:00, Wed., 16 Jul. 0.0363 0.0325 0.0346
20:01-21:00, Wed., 16 Jul. 0.0364 0.0326 0.0346