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
12:01-13:00, Sun., 12 Jul. 0.0399 0.0342 0.0361
11:01-12:00, Sun., 12 Jul. 0.0382 0.0333 0.0357
10:01-11:00, Sun., 12 Jul. 0.0395 0.0329 0.0358
09:01-10:00, Sun., 12 Jul. 0.0389 0.0333 0.0357
08:01-09:00, Sun., 12 Jul. 0.0383 0.0335 0.0358
07:01-08:00, Sun., 12 Jul. 0.0383 0.0340 0.0359
06:01-07:00, Sun., 12 Jul. 0.0375 0.0338 0.0357
05:01-06:00, Sun., 12 Jul. 0.0395 0.0342 0.0358
04:01-05:00, Sun., 12 Jul. 0.0387 0.0334 0.0358
03:01-04:00, Sun., 12 Jul. 0.0395 0.0336 0.0356
02:01-03:00, Sun., 12 Jul. 0.0383 0.0340 0.0357
01:01-02:00, Sun., 12 Jul. 0.0380 0.0331 0.0357
00:01-01:00, Sun., 12 Jul. 0.0381 0.0334 0.0355
23:01-24:00, Sat., 11 Jul. 0.0373 0.0332 0.0355
22:01-23:00, Sat., 11 Jul. 0.0381 0.0334 0.0356
21:01-22:00, Sat., 11 Jul. 0.0374 0.0344 0.0357
20:01-21:00, Sat., 11 Jul. 0.0384 0.0338 0.0358
19:01-20:00, Sat., 11 Jul. 0.0375 0.0339 0.0356
18:01-19:00, Sat., 11 Jul. 0.0373 0.0338 0.0357
17:01-18:00, Sat., 11 Jul. 0.0379 0.0334 0.0357
16:01-17:00, Sat., 11 Jul. 0.0405 0.0338 0.0360
15:01-16:00, Sat., 11 Jul. 0.0378 0.0329 0.0354
14:01-15:00, Sat., 11 Jul. 0.0388 0.0336 0.0356
13:01-14:00, Sat., 11 Jul. 0.0379 0.0336 0.0355
12:01-13:00, Sat., 11 Jul. 0.0375 0.0335 0.0357
11:01-12:00, Sat., 11 Jul. 0.0375 0.0336 0.0356
10:01-11:00, Sat., 11 Jul. 0.0371 0.0326 0.0355
09:01-10:00, Sat., 11 Jul. 0.0396 0.0338 0.0356
08:01-09:00, Sat., 11 Jul. 0.0373 0.0331 0.0357
07:01-08:00, Sat., 11 Jul. 0.0387 0.0333 0.0357
06:01-07:00, Sat., 11 Jul. 0.0377 0.0330 0.0358
05:01-06:00, Sat., 11 Jul. 0.0378 0.0336 0.0354
04:01-05:00, Sat., 11 Jul. 0.0373 0.0335 0.0354
03:01-04:00, Sat., 11 Jul. 0.0379 0.0334 0.0355
02:01-03:00, Sat., 11 Jul. 0.0371 0.0330 0.0353
01:01-02:00, Sat., 11 Jul. 0.0373 0.0334 0.0356
00:01-01:00, Sat., 11 Jul. 0.0375 0.0328 0.0355
23:01-24:00, Fri., 10 Jul. 0.0386 0.0338 0.0356
22:01-23:00, Fri., 10 Jul. 0.0381 0.0338 0.0358
21:01-22:00, Fri., 10 Jul. 0.0384 0.0323 0.0356
20:01-21:00, Fri., 10 Jul. 0.0371 0.0329 0.0352
19:01-20:00, Fri., 10 Jul. 0.0385 0.0329 0.0355
18:01-19:00, Fri., 10 Jul. 0.0369 0.0331 0.0355
17:01-18:00, Fri., 10 Jul. 0.0386 0.0336 0.0357
16:01-17:00, Fri., 10 Jul. 0.0376 0.0332 0.0356
15:01-16:00, Fri., 10 Jul. 0.0385 0.0335 0.0357
14:01-15:00, Fri., 10 Jul. 0.0385 0.0332 0.0353
13:01-14:00, Fri., 10 Jul. 0.0381 0.0325 0.0353
12:01-13:00, Fri., 10 Jul. 0.0370 0.0333 0.0353
11:01-12:00, Fri., 10 Jul. 0.0376 0.0336 0.0355
10:01-11:00, Fri., 10 Jul. 0.0385 0.0331 0.0355
09:01-10:00, Fri., 10 Jul. 0.0385 0.0338 0.0356
08:01-09:00, Fri., 10 Jul. 0.0380 0.0325 0.0352
07:01-08:00, Fri., 10 Jul. 0.0390 0.0329 0.0354
06:01-07:00, Fri., 10 Jul. 0.0373 0.0334 0.0357
05:01-06:00, Fri., 10 Jul. 0.0371 0.0327 0.0351
04:01-05:00, Fri., 10 Jul. 0.0378 0.0334 0.0354
03:01-04:00, Fri., 10 Jul. 0.0378 0.0334 0.0354
02:01-03:00, Fri., 10 Jul. 0.0383 0.0332 0.0355
01:01-02:00, Fri., 10 Jul. 0.0372 0.0335 0.0352
00:01-01:00, Fri., 10 Jul. 0.0371 0.0329 0.0350
23:01-24:00, Thu., 09 Jul. 0.0385 0.0334 0.0353
22:01-23:00, Thu., 09 Jul. 0.0374 0.0333 0.0355
21:01-22:00, Thu., 09 Jul. 0.0370 0.0333 0.0354
20:01-21:00, Thu., 09 Jul. 0.0378 0.0330 0.0354
19:01-20:00, Thu., 09 Jul. 0.0371 0.0336 0.0355
18:01-19:00, Thu., 09 Jul. 0.0370 0.0328 0.0352
17:01-18:00, Thu., 09 Jul. 0.0380 0.0333 0.0355
16:01-17:00, Thu., 09 Jul. 0.0371 0.0336 0.0355
15:01-16:00, Thu., 09 Jul. 0.0372 0.0336 0.0356
14:01-15:00, Thu., 09 Jul. 0.0387 0.0327 0.0356
13:01-14:00, Thu., 09 Jul. 0.0372 0.0327 0.0354
12:01-13:00, Thu., 09 Jul. 0.0373 0.0333 0.0353
11:01-12:00, Thu., 09 Jul. 0.0383 0.0336 0.0354
10:01-11:00, Thu., 09 Jul. 0.0410 0.0332 0.0357
09:01-10:00, Thu., 09 Jul. 0.0387 0.0342 0.0358
08:01-09:00, Thu., 09 Jul. 0.0367 0.0335 0.0353
07:01-08:00, Thu., 09 Jul. 0.0374 0.0336 0.0352
06:01-07:00, Thu., 09 Jul. 0.0404 0.0334 0.0354
05:01-06:00, Thu., 09 Jul. 0.0391 0.0324 0.0355
04:01-05:00, Thu., 09 Jul. 0.0372 0.0337 0.0354
03:01-04:00, Thu., 09 Jul. 0.0384 0.0334 0.0354
02:01-03:00, Thu., 09 Jul. 0.0386 0.0334 0.0352
01:01-02:00, Thu., 09 Jul. 0.0375 0.0335 0.0354
00:01-01:00, Thu., 09 Jul. 0.0386 0.0333 0.0353
23:01-24:00, Wed., 08 Jul. 0.0376 0.0330 0.0352
22:01-23:00, Wed., 08 Jul. 0.0370 0.0331 0.0353
21:01-22:00, Wed., 08 Jul. 0.0372 0.0334 0.0352
20:01-21:00, Wed., 08 Jul. 0.0371 0.0334 0.0354
19:01-20:00, Wed., 08 Jul. 0.0396 0.0326 0.0353
18:01-19:00, Wed., 08 Jul. 0.0373 0.0332 0.0354
17:01-18:00, Wed., 08 Jul. 0.0373 0.0335 0.0352
16:01-17:00, Wed., 08 Jul. 0.0386 0.0335 0.0353
15:01-16:00, Wed., 08 Jul. 0.0372 0.0336 0.0354
14:01-15:00, Wed., 08 Jul. 0.0389 0.0326 0.0352
13:01-14:00, Wed., 08 Jul. 0.0376 0.0332 0.0353
12:01-13:00, Wed., 08 Jul. 0.0385 0.0325 0.0352
11:01-12:00, Wed., 08 Jul. 0.0400 0.0332 0.0355
10:01-11:00, Wed., 08 Jul. 0.0414 0.0337 0.0357
09:01-10:00, Wed., 08 Jul. 0.0379 0.0339 0.0360
08:01-09:00, Wed., 08 Jul. 0.0380 0.0334 0.0354
07:01-08:00, Wed., 08 Jul. 0.0382 0.0336 0.0354
06:01-07:00, Wed., 08 Jul. 0.0380 0.0323 0.0352
05:01-06:00, Wed., 08 Jul. 0.0369 0.0335 0.0351
04:01-05:00, Wed., 08 Jul. 0.0371 0.0328 0.0352
03:01-04:00, Wed., 08 Jul. 0.0377 0.0333 0.0352
02:01-03:00, Wed., 08 Jul. 0.0378 0.0328 0.0351
01:01-02:00, Wed., 08 Jul. 0.0383 0.0333 0.0353
00:01-01:00, Wed., 08 Jul. 0.0373 0.0336 0.0353
23:01-24:00, Tue., 07 Jul. 0.0368 0.0333 0.0352
22:01-23:00, Tue., 07 Jul. 0.0369 0.0320 0.0353
21:01-22:00, Tue., 07 Jul. 0.0370 0.0328 0.0352
20:01-21:00, Tue., 07 Jul. 0.0377 0.0332 0.0354
19:01-20:00, Tue., 07 Jul. 0.0374 0.0334 0.0355
18:01-19:00, Tue., 07 Jul. 0.0382 0.0337 0.0353
17:01-18:00, Tue., 07 Jul. 0.0382 0.0333 0.0353
16:01-17:00, Tue., 07 Jul. 0.0392 0.0325 0.0353
15:01-16:00, Tue., 07 Jul. 0.0366 0.0328 0.0350
14:01-15:00, Tue., 07 Jul. 0.0375 0.0336 0.0352
13:01-14:00, Tue., 07 Jul. 0.0371 0.0333 0.0352
12:01-13:00, Tue., 07 Jul. 0.0391 0.0336 0.0357
11:01-12:00, Tue., 07 Jul. 0.0374 0.0332 0.0356
10:01-11:00, Tue., 07 Jul. 0.0375 0.0335 0.0358
09:01-10:00, Tue., 07 Jul. 0.0373 0.0333 0.0356
08:01-09:00, Tue., 07 Jul. 0.0379 0.0328 0.0354
07:01-08:00, Tue., 07 Jul. 0.0380 0.0330 0.0355
06:01-07:00, Tue., 07 Jul. 0.0374 0.0338 0.0358
05:01-06:00, Tue., 07 Jul. 0.0373 0.0337 0.0355
04:01-05:00, Tue., 07 Jul. 0.0375 0.0326 0.0355
03:01-04:00, Tue., 07 Jul. 0.0372 0.0335 0.0355
02:01-03:00, Tue., 07 Jul. 0.0373 0.0343 0.0356
01:01-02:00, Tue., 07 Jul. 0.0373 0.0331 0.0354
00:01-01:00, Tue., 07 Jul. 0.0388 0.0332 0.0351
23:01-24:00, Mon., 06 Jul. 0.0380 0.0320 0.0353
22:01-23:00, Mon., 06 Jul. 0.0372 0.0331 0.0350
21:01-22:00, Mon., 06 Jul. 0.0372 0.0324 0.0350
20:01-21:00, Mon., 06 Jul. 0.0382 0.0336 0.0355
19:01-20:00, Mon., 06 Jul. 0.0416 0.0342 0.0369
18:01-19:00, Mon., 06 Jul. 0.0449 0.0366 0.0410
17:01-18:00, Mon., 06 Jul. 0.0433 0.0339 0.0374
16:01-17:00, Mon., 06 Jul. 0.0372 0.0331 0.0352
15:01-16:00, Mon., 06 Jul. 0.0374 0.0327 0.0350
14:01-15:00, Mon., 06 Jul. 0.0379 0.0323 0.0351
13:01-14:00, Mon., 06 Jul. 0.0370 0.0336 0.0353
12:01-13:00, Mon., 06 Jul. 0.0374 0.0328 0.0352
11:01-12:00, Mon., 06 Jul. 0.0371 0.0326 0.0352
10:01-11:00, Mon., 06 Jul. 0.0388 0.0334 0.0357
09:01-10:00, Mon., 06 Jul. 0.0405 0.0337 0.0358
08:01-09:00, Mon., 06 Jul. 0.0382 0.0343 0.0359
07:01-08:00, Mon., 06 Jul. 0.0381 0.0339 0.0356
06:01-07:00, Mon., 06 Jul. 0.0398 0.0333 0.0353
05:01-06:00, Mon., 06 Jul. 0.0396 0.0334 0.0355
04:01-05:00, Mon., 06 Jul. 0.0394 0.0352 0.0366
03:01-04:00, Mon., 06 Jul. 0.0386 0.0331 0.0361
02:01-03:00, Mon., 06 Jul. 0.0398 0.0333 0.0361
01:01-02:00, Mon., 06 Jul. 0.0407 0.0343 0.0369
00:01-01:00, Mon., 06 Jul. 0.0423 0.0354 0.0382
23:01-24:00, Sun., 05 Jul. 0.0396 0.0334 0.0362
22:01-23:00, Sun., 05 Jul. 0.0372 0.0319 0.0352
21:01-22:00, Sun., 05 Jul. 0.0385 0.0333 0.0352
20:01-21:00, Sun., 05 Jul. 0.0383 0.0337 0.0356
19:01-20:00, Sun., 05 Jul. 0.0370 0.0332 0.0353
18:01-19:00, Sun., 05 Jul. 0.0375 0.0333 0.0355
17:01-18:00, Sun., 05 Jul. 0.0366 0.0333 0.0351
16:01-17:00, Sun., 05 Jul. 0.0385 0.0327 0.0352
15:01-16:00, Sun., 05 Jul. 0.0387 0.0315 0.0354
14:01-15:00, Sun., 05 Jul. 0.0372 0.0321 0.0354
13:01-14:00, Sun., 05 Jul. 0.0376 0.0333 0.0355
12:01-13:00, Sun., 05 Jul. 0.0368 0.0331 0.0351
11:01-12:00, Sun., 05 Jul. 0.0370 0.0329 0.0351
10:01-11:00, Sun., 05 Jul. 0.0382 0.0337 0.0352
09:01-10:00, Sun., 05 Jul. 0.0380 0.0331 0.0350
08:01-09:00, Sun., 05 Jul. 0.0385 0.0329 0.0357
07:01-08:00, Sun., 05 Jul. 0.0376 0.0335 0.0355
06:01-07:00, Sun., 05 Jul. 0.0395 0.0328 0.0353
05:01-06:00, Sun., 05 Jul. 0.0391 0.0323 0.0352
04:01-05:00, Sun., 05 Jul. 0.0379 0.0334 0.0353
03:01-04:00, Sun., 05 Jul. 0.0369 0.0336 0.0354
02:01-03:00, Sun., 05 Jul. 0.0379 0.0325 0.0354
01:01-02:00, Sun., 05 Jul. 0.0373 0.0329 0.0352
00:01-01:00, Sun., 05 Jul. 0.0374 0.0335 0.0352
23:01-24:00, Sat., 04 Jul. 0.0374 0.0327 0.0349
22:01-23:00, Sat., 04 Jul. 0.0372 0.0336 0.0352
21:01-22:00, Sat., 04 Jul. 0.0373 0.0324 0.0353
20:01-21:00, Sat., 04 Jul. 0.0367 0.0330 0.0351
19:01-20:00, Sat., 04 Jul. 0.0373 0.0325 0.0351
18:01-19:00, Sat., 04 Jul. 0.0377 0.0328 0.0353
17:01-18:00, Sat., 04 Jul. 0.0382 0.0319 0.0351
16:01-17:00, Sat., 04 Jul. 0.0373 0.0323 0.0352
15:01-16:00, Sat., 04 Jul. 0.0371 0.0334 0.0352
14:01-15:00, Sat., 04 Jul. 0.0372 0.0331 0.0352
13:01-14:00, Sat., 04 Jul. 0.0378 0.0328 0.0353
12:01-13:00, Sat., 04 Jul. 0.0374 0.0325 0.0354
11:01-12:00, Sat., 04 Jul. 0.0371 0.0328 0.0351
10:01-11:00, Sat., 04 Jul. 0.0367 0.0327 0.0352
09:01-10:00, Sat., 04 Jul. 0.0370 0.0336 0.0352
08:01-09:00, Sat., 04 Jul. 0.0376 0.0333 0.0354
07:01-08:00, Sat., 04 Jul. 0.0370 0.0331 0.0352
06:01-07:00, Sat., 04 Jul. 0.0379 0.0331 0.0354
05:01-06:00, Sat., 04 Jul. 0.0371 0.0330 0.0350
04:01-05:00, Sat., 04 Jul. 0.0369 0.0329 0.0350
03:01-04:00, Sat., 04 Jul. 0.0370 0.0328 0.0350
02:01-03:00, Sat., 04 Jul. 0.0371 0.0328 0.0352
01:01-02:00, Sat., 04 Jul. 0.0372 0.0331 0.0354
00:01-01:00, Sat., 04 Jul. 0.0380 0.0335 0.0353
23:01-24:00, Fri., 03 Jul. 0.0382 0.0325 0.0353
22:01-23:00, Fri., 03 Jul. 0.0372 0.0322 0.0352
21:01-22:00, Fri., 03 Jul. 0.0366 0.0327 0.0347
20:01-21:00, Fri., 03 Jul. 0.0372 0.0332 0.0350
19:01-20:00, Fri., 03 Jul. 0.0368 0.0332 0.0351
18:01-19:00, Fri., 03 Jul. 0.0378 0.0334 0.0353
17:01-18:00, Fri., 03 Jul. 0.0367 0.0335 0.0351
16:01-17:00, Fri., 03 Jul. 0.0375 0.0324 0.0352
15:01-16:00, Fri., 03 Jul. 0.0370 0.0327 0.0350
14:01-15:00, Fri., 03 Jul. 0.0389 0.0320 0.0352
13:01-14:00, Fri., 03 Jul. 0.0373 0.0335 0.0354
12:01-13:00, Fri., 03 Jul. 0.0386 0.0330 0.0355
11:01-12:00, Fri., 03 Jul. 0.0370 0.0336 0.0350
10:01-11:00, Fri., 03 Jul. 0.0381 0.0323 0.0351
09:01-10:00, Fri., 03 Jul. 0.0370 0.0332 0.0348
08:01-09:00, Fri., 03 Jul. 0.0374 0.0334 0.0355
07:01-08:00, Fri., 03 Jul. 0.0394 0.0328 0.0361
06:01-07:00, Fri., 03 Jul. 0.0428 0.0348 0.0380
05:01-06:00, Fri., 03 Jul. 0.0434 0.0368 0.0398
04:01-05:00, Fri., 03 Jul. 0.0445 0.0366 0.0408
03:01-04:00, Fri., 03 Jul. 0.0419 0.0358 0.0380
02:01-03:00, Fri., 03 Jul. 0.0386 0.0341 0.0362
01:01-02:00, Fri., 03 Jul. 0.0402 0.0344 0.0365
00:01-01:00, Fri., 03 Jul. 0.0376 0.0325 0.0354
23:01-24:00, Thu., 02 Jul. 0.0380 0.0328 0.0349
22:01-23:00, Thu., 02 Jul. 0.0372 0.0337 0.0353
21:01-22:00, Thu., 02 Jul. 0.0384 0.0330 0.0352
20:01-21:00, Thu., 02 Jul. 0.0374 0.0327 0.0352
19:01-20:00, Thu., 02 Jul. 0.0373 0.0334 0.0352
18:01-19:00, Thu., 02 Jul. 0.0377 0.0336 0.0356
17:01-18:00, Thu., 02 Jul. 0.0387 0.0336 0.0359
16:01-17:00, Thu., 02 Jul. 0.0370 0.0332 0.0353
15:01-16:00, Thu., 02 Jul. 0.0374 0.0326 0.0355
14:01-15:00, Thu., 02 Jul. 0.0381 0.0328 0.0359
13:01-14:00, Thu., 02 Jul. 0.0405 0.0340 0.0363