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
16:01-17:00, Fri., 06 Mar. 0.0389 0.0334 0.0360
15:01-16:00, Fri., 06 Mar. 0.0381 0.0324 0.0357
14:01-15:00, Fri., 06 Mar. 0.0375 0.0339 0.0358
13:01-14:00, Fri., 06 Mar. 0.0374 0.0335 0.0355
12:01-13:00, Fri., 06 Mar. 0.0384 0.0332 0.0355
11:01-12:00, Fri., 06 Mar. 0.0393 0.0341 0.0359
10:01-11:00, Fri., 06 Mar. 0.0385 0.0330 0.0358
09:01-10:00, Fri., 06 Mar. 0.0405 0.0337 0.0359
08:01-09:00, Fri., 06 Mar. 0.0388 0.0345 0.0359
07:01-08:00, Fri., 06 Mar. 0.0397 0.0340 0.0359
06:01-07:00, Fri., 06 Mar. 0.0390 0.0334 0.0359
05:01-06:00, Fri., 06 Mar. 0.0390 0.0329 0.0356
04:01-05:00, Fri., 06 Mar. 0.0381 0.0331 0.0353
03:01-04:00, Fri., 06 Mar. 0.0377 0.0334 0.0354
02:01-03:00, Fri., 06 Mar. 0.0369 0.0328 0.0355
01:01-02:00, Fri., 06 Mar. 0.0382 0.0336 0.0355
00:01-01:00, Fri., 06 Mar. 0.0376 0.0336 0.0354
23:01-24:00, Thu., 05 Mar. 0.0376 0.0332 0.0353
22:01-23:00, Thu., 05 Mar. 0.0384 0.0334 0.0352
21:01-22:00, Thu., 05 Mar. 0.0377 0.0334 0.0355
20:01-21:00, Thu., 05 Mar. 0.0395 0.0335 0.0355
19:01-20:00, Thu., 05 Mar. 0.0386 0.0326 0.0355
18:01-19:00, Thu., 05 Mar. 0.0386 0.0325 0.0352
17:01-18:00, Thu., 05 Mar. 0.0375 0.0333 0.0355
16:01-17:00, Thu., 05 Mar. 0.0375 0.0332 0.0355
15:01-16:00, Thu., 05 Mar. 0.0386 0.0331 0.0355
14:01-15:00, Thu., 05 Mar. 0.0388 0.0337 0.0358
13:01-14:00, Thu., 05 Mar. 0.0382 0.0330 0.0355
12:01-13:00, Thu., 05 Mar. 0.0376 0.0336 0.0357
11:01-12:00, Thu., 05 Mar. 0.0381 0.0329 0.0354
10:01-11:00, Thu., 05 Mar. 0.0381 0.0330 0.0356
09:01-10:00, Thu., 05 Mar. 0.0380 0.0332 0.0357
08:01-09:00, Thu., 05 Mar. 0.0370 0.0326 0.0353
07:01-08:00, Thu., 05 Mar. 0.0382 0.0329 0.0355
06:01-07:00, Thu., 05 Mar. 0.0384 0.0329 0.0356
05:01-06:00, Thu., 05 Mar. 0.0370 0.0337 0.0357
04:01-05:00, Thu., 05 Mar. 0.0377 0.0333 0.0355
03:01-04:00, Thu., 05 Mar. 0.0377 0.0336 0.0353
02:01-03:00, Thu., 05 Mar. 0.0393 0.0333 0.0357
01:01-02:00, Thu., 05 Mar. 0.0372 0.0329 0.0353
00:01-01:00, Thu., 05 Mar. 0.0375 0.0339 0.0354
23:01-24:00, Wed., 04 Mar. 0.0370 0.0323 0.0353
22:01-23:00, Wed., 04 Mar. 0.0388 0.0333 0.0352
21:01-22:00, Wed., 04 Mar. 0.0387 0.0329 0.0354
20:01-21:00, Wed., 04 Mar. 0.0377 0.0333 0.0357
19:01-20:00, Wed., 04 Mar. 0.0375 0.0337 0.0355
18:01-19:00, Wed., 04 Mar. 0.0379 0.0333 0.0355
17:01-18:00, Wed., 04 Mar. 0.0379 0.0330 0.0354
16:01-17:00, Wed., 04 Mar. 0.0379 0.0325 0.0354
15:01-16:00, Wed., 04 Mar. 0.0398 0.0327 0.0354
14:01-15:00, Wed., 04 Mar. 0.0380 0.0330 0.0355
13:01-14:00, Wed., 04 Mar. 0.0372 0.0333 0.0355
12:01-13:00, Wed., 04 Mar. 0.0382 0.0331 0.0357
11:01-12:00, Wed., 04 Mar. 0.0380 0.0338 0.0358
10:01-11:00, Wed., 04 Mar. 0.0400 0.0341 0.0361
09:01-10:00, Wed., 04 Mar. 0.0411 0.0333 0.0369
08:01-09:00, Wed., 04 Mar. 0.0436 0.0360 0.0401
07:01-08:00, Wed., 04 Mar. 0.0448 0.0368 0.0409
06:01-07:00, Wed., 04 Mar. 0.0443 0.0383 0.0412
05:01-06:00, Wed., 04 Mar. 0.0494 0.0411 0.0450
04:01-05:00, Wed., 04 Mar. 0.0538 0.0443 0.0497
03:01-04:00, Wed., 04 Mar. 0.0579 0.0491 0.0543
02:01-03:00, Wed., 04 Mar. 0.0552 0.0475 0.0513
01:01-02:00, Wed., 04 Mar. 0.0588 0.0474 0.0540
00:01-01:00, Wed., 04 Mar. 0.0587 0.0493 0.0536
23:01-24:00, Tue., 03 Mar. 0.0539 0.0397 0.0464
22:01-23:00, Tue., 03 Mar. 0.0566 0.0440 0.0505
21:01-22:00, Tue., 03 Mar. 0.0557 0.0455 0.0514
20:01-21:00, Tue., 03 Mar. 0.0534 0.0442 0.0494
19:01-20:00, Tue., 03 Mar. 0.0577 0.0492 0.0533
18:01-19:00, Tue., 03 Mar. 0.0571 0.0463 0.0514
17:01-18:00, Tue., 03 Mar. 0.0553 0.0464 0.0509
16:01-17:00, Tue., 03 Mar. 0.0560 0.0471 0.0517
15:01-16:00, Tue., 03 Mar. 0.0529 0.0431 0.0481
14:01-15:00, Tue., 03 Mar. 0.0497 0.0410 0.0457
13:01-14:00, Tue., 03 Mar. 0.0490 0.0392 0.0449
12:01-13:00, Tue., 03 Mar. 0.0464 0.0410 0.0440
11:01-12:00, Tue., 03 Mar. 0.0487 0.0410 0.0452
10:01-11:00, Tue., 03 Mar. 0.0481 0.0384 0.0436
09:01-10:00, Tue., 03 Mar. 0.0456 0.0391 0.0420
08:01-09:00, Tue., 03 Mar. 0.0442 0.0375 0.0414
07:01-08:00, Tue., 03 Mar. 0.0450 0.0374 0.0415
06:01-07:00, Tue., 03 Mar. 0.0448 0.0367 0.0407
05:01-06:00, Tue., 03 Mar. 0.0442 0.0352 0.0385
04:01-05:00, Tue., 03 Mar. 0.0385 0.0337 0.0361
03:01-04:00, Tue., 03 Mar. 0.0393 0.0335 0.0357
02:01-03:00, Tue., 03 Mar. 0.0372 0.0335 0.0357
01:01-02:00, Tue., 03 Mar. 0.0388 0.0336 0.0359
00:01-01:00, Tue., 03 Mar. 0.0373 0.0330 0.0357
23:01-24:00, Mon., 02 Mar. 0.0382 0.0332 0.0356
22:01-23:00, Mon., 02 Mar. 0.0380 0.0342 0.0358
21:01-22:00, Mon., 02 Mar. 0.0369 0.0335 0.0356
20:01-21:00, Mon., 02 Mar. 0.0388 0.0335 0.0358
19:01-20:00, Mon., 02 Mar. 0.0372 0.0329 0.0356
18:01-19:00, Mon., 02 Mar. 0.0383 0.0334 0.0358
17:01-18:00, Mon., 02 Mar. 0.0389 0.0337 0.0359
16:01-17:00, Mon., 02 Mar. 0.0373 0.0328 0.0355
15:01-16:00, Mon., 02 Mar. 0.0378 0.0340 0.0357
14:01-15:00, Mon., 02 Mar. 0.0388 0.0332 0.0354
13:01-14:00, Mon., 02 Mar. 0.0396 0.0341 0.0361
12:01-13:00, Mon., 02 Mar. 0.0386 0.0342 0.0360
11:01-12:00, Mon., 02 Mar. 0.0388 0.0341 0.0359
10:01-11:00, Mon., 02 Mar. 0.0385 0.0334 0.0359
09:01-10:00, Mon., 02 Mar. 0.0388 0.0326 0.0362
08:01-09:00, Mon., 02 Mar. 0.0393 0.0340 0.0364
07:01-08:00, Mon., 02 Mar. 0.0413 0.0346 0.0368
06:01-07:00, Mon., 02 Mar. 0.0376 0.0336 0.0361
05:01-06:00, Mon., 02 Mar. 0.0391 0.0342 0.0362
04:01-05:00, Mon., 02 Mar. 0.0395 0.0344 0.0363
03:01-04:00, Mon., 02 Mar. 0.0387 0.0345 0.0365
02:01-03:00, Mon., 02 Mar. 0.0386 0.0344 0.0360
01:01-02:00, Mon., 02 Mar. 0.0392 0.0343 0.0359
00:01-01:00, Mon., 02 Mar. 0.0385 0.0337 0.0357
23:01-24:00, Sun., 01 Mar. 0.0397 0.0339 0.0358
22:01-23:00, Sun., 01 Mar. 0.0384 0.0322 0.0357
21:01-22:00, Sun., 01 Mar. 0.0384 0.0331 0.0358
20:01-21:00, Sun., 01 Mar. 0.0378 0.0333 0.0357
19:01-20:00, Sun., 01 Mar. 0.0375 0.0334 0.0356
18:01-19:00, Sun., 01 Mar. 0.0374 0.0340 0.0358
17:01-18:00, Sun., 01 Mar. 0.0378 0.0340 0.0357
16:01-17:00, Sun., 01 Mar. 0.0379 0.0333 0.0356
15:01-16:00, Sun., 01 Mar. 0.0387 0.0346 0.0360
14:01-15:00, Sun., 01 Mar. 0.0384 0.0342 0.0359
13:01-14:00, Sun., 01 Mar. 0.0378 0.0339 0.0358
12:01-13:00, Sun., 01 Mar. 0.0385 0.0343 0.0359
11:01-12:00, Sun., 01 Mar. 0.0389 0.0342 0.0360
10:01-11:00, Sun., 01 Mar. 0.0389 0.0334 0.0359
09:01-10:00, Sun., 01 Mar. 0.0381 0.0338 0.0357
08:01-09:00, Sun., 01 Mar. 0.0383 0.0336 0.0356
07:01-08:00, Sun., 01 Mar. 0.0382 0.0334 0.0355
06:01-07:00, Sun., 01 Mar. 0.0374 0.0334 0.0355
05:01-06:00, Sun., 01 Mar. 0.0373 0.0338 0.0355
04:01-05:00, Sun., 01 Mar. 0.0392 0.0335 0.0356
03:01-04:00, Sun., 01 Mar. 0.0373 0.0340 0.0356
02:01-03:00, Sun., 01 Mar. 0.0383 0.0342 0.0358
01:01-02:00, Sun., 01 Mar. 0.0392 0.0334 0.0358
00:01-01:00, Sun., 01 Mar. 0.0373 0.0331 0.0354
23:01-24:00, Sat., 28 Feb. 0.0373 0.0338 0.0356
22:01-23:00, Sat., 28 Feb. 0.0373 0.0331 0.0355
21:01-22:00, Sat., 28 Feb. 0.0391 0.0333 0.0355
20:01-21:00, Sat., 28 Feb. 0.0385 0.0333 0.0356
19:01-20:00, Sat., 28 Feb. 0.0378 0.0332 0.0356
18:01-19:00, Sat., 28 Feb. 0.0374 0.0331 0.0358
17:01-18:00, Sat., 28 Feb. 0.0372 0.0334 0.0356
16:01-17:00, Sat., 28 Feb. 0.0374 0.0333 0.0358
15:01-16:00, Sat., 28 Feb. 0.0371 0.0340 0.0356
14:01-15:00, Sat., 28 Feb. 0.0399 0.0330 0.0358
13:01-14:00, Sat., 28 Feb. 0.0395 0.0343 0.0361
12:01-13:00, Sat., 28 Feb. 0.0387 0.0345 0.0363
11:01-12:00, Sat., 28 Feb. 0.0392 0.0341 0.0361
10:01-11:00, Sat., 28 Feb. 0.0373 0.0335 0.0360
09:01-10:00, Sat., 28 Feb. 0.0402 0.0344 0.0362
08:01-09:00, Sat., 28 Feb. 0.0389 0.0342 0.0362
07:01-08:00, Sat., 28 Feb. 0.0393 0.0346 0.0362
06:01-07:00, Sat., 28 Feb. 0.0377 0.0339 0.0357
05:01-06:00, Sat., 28 Feb. 0.0373 0.0340 0.0357
04:01-05:00, Sat., 28 Feb. 0.0372 0.0334 0.0355
03:01-04:00, Sat., 28 Feb. 0.0389 0.0335 0.0357
02:01-03:00, Sat., 28 Feb. 0.0380 0.0327 0.0355
01:01-02:00, Sat., 28 Feb. 0.0377 0.0335 0.0356
00:01-01:00, Sat., 28 Feb. 0.0366 0.0325 0.0355
23:01-24:00, Fri., 27 Feb. 0.0383 0.0330 0.0356
22:01-23:00, Fri., 27 Feb. 0.0368 0.0331 0.0351
21:01-22:00, Fri., 27 Feb. 0.0375 0.0335 0.0356
20:01-21:00, Fri., 27 Feb. 0.0373 0.0339 0.0357
19:01-20:00, Fri., 27 Feb. 0.0384 0.0329 0.0357
18:01-19:00, Fri., 27 Feb. 0.0375 0.0330 0.0353
17:01-18:00, Fri., 27 Feb. 0.0375 0.0340 0.0354
16:01-17:00, Fri., 27 Feb. 0.0382 0.0335 0.0356
15:01-16:00, Fri., 27 Feb. 0.0374 0.0332 0.0356
14:01-15:00, Fri., 27 Feb. 0.0376 0.0341 0.0355
13:01-14:00, Fri., 27 Feb. 0.0371 0.0332 0.0355
12:01-13:00, Fri., 27 Feb. 0.0391 0.0339 0.0356
11:01-12:00, Fri., 27 Feb. 0.0387 0.0333 0.0354
10:01-11:00, Fri., 27 Feb. 0.0387 0.0327 0.0355
09:01-10:00, Fri., 27 Feb. 0.0373 0.0332 0.0352
08:01-09:00, Fri., 27 Feb. 0.0382 0.0336 0.0354
07:01-08:00, Fri., 27 Feb. 0.0375 0.0335 0.0355
06:01-07:00, Fri., 27 Feb. 0.0386 0.0331 0.0355
05:01-06:00, Fri., 27 Feb. 0.0380 0.0327 0.0353
04:01-05:00, Fri., 27 Feb. 0.0378 0.0333 0.0354
03:01-04:00, Fri., 27 Feb. 0.0376 0.0327 0.0353
02:01-03:00, Fri., 27 Feb. 0.0373 0.0332 0.0352
01:01-02:00, Fri., 27 Feb. 0.0367 0.0333 0.0354
00:01-01:00, Fri., 27 Feb. 0.0372 0.0329 0.0352
23:01-24:00, Thu., 26 Feb. 0.0389 0.0327 0.0354
22:01-23:00, Thu., 26 Feb. 0.0382 0.0328 0.0354
21:01-22:00, Thu., 26 Feb. 0.0392 0.0330 0.0355
20:01-21:00, Thu., 26 Feb. 0.0377 0.0334 0.0357
19:01-20:00, Thu., 26 Feb. 0.0372 0.0336 0.0355
18:01-19:00, Thu., 26 Feb. 0.0378 0.0337 0.0355
17:01-18:00, Thu., 26 Feb. 0.0388 0.0327 0.0353
16:01-17:00, Thu., 26 Feb. 0.0377 0.0334 0.0351
15:01-16:00, Thu., 26 Feb. 0.0373 0.0334 0.0353
14:01-15:00, Thu., 26 Feb. 0.0388 0.0334 0.0355
13:01-14:00, Thu., 26 Feb. 0.0372 0.0330 0.0354
12:01-13:00, Thu., 26 Feb. 0.0372 0.0328 0.0354
11:01-12:00, Thu., 26 Feb. 0.0370 0.0334 0.0350
10:01-11:00, Thu., 26 Feb. 0.0390 0.0327 0.0354
09:01-10:00, Thu., 26 Feb. 0.0384 0.0331 0.0352
08:01-09:00, Thu., 26 Feb. 0.0376 0.0333 0.0350
07:01-08:00, Thu., 26 Feb. 0.0375 0.0335 0.0353
06:01-07:00, Thu., 26 Feb. 0.0394 0.0332 0.0355
05:01-06:00, Thu., 26 Feb. 0.0387 0.0332 0.0357
04:01-05:00, Thu., 26 Feb. 0.0397 0.0340 0.0367
03:01-04:00, Thu., 26 Feb. 0.0437 0.0361 0.0393
02:01-03:00, Thu., 26 Feb. 0.0482 0.0387 0.0424
01:01-02:00, Thu., 26 Feb. 0.0460 0.0393 0.0419
00:01-01:00, Thu., 26 Feb. 0.0484 0.0386 0.0436
23:01-24:00, Wed., 25 Feb. 0.0481 0.0414 0.0448
22:01-23:00, Wed., 25 Feb. 0.0486 0.0421 0.0453
21:01-22:00, Wed., 25 Feb. 0.0469 0.0392 0.0430
20:01-21:00, Wed., 25 Feb. 0.0456 0.0385 0.0418
19:01-20:00, Wed., 25 Feb. 0.0445 0.0389 0.0414
18:01-19:00, Wed., 25 Feb. 0.0465 0.0371 0.0415
17:01-18:00, Wed., 25 Feb. 0.0429 0.0360 0.0393
16:01-17:00, Wed., 25 Feb. 0.0444 0.0364 0.0407
15:01-16:00, Wed., 25 Feb. 0.0474 0.0396 0.0435
14:01-15:00, Wed., 25 Feb. 0.0468 0.0399 0.0441
13:01-14:00, Wed., 25 Feb. 0.0477 0.0408 0.0445
12:01-13:00, Wed., 25 Feb. 0.0498 0.0393 0.0437
11:01-12:00, Wed., 25 Feb. 0.0458 0.0379 0.0424
10:01-11:00, Wed., 25 Feb. 0.0432 0.0362 0.0395
09:01-10:00, Wed., 25 Feb. 0.0428 0.0362 0.0391
08:01-09:00, Wed., 25 Feb. 0.0418 0.0358 0.0379
07:01-08:00, Wed., 25 Feb. 0.0419 0.0351 0.0378
06:01-07:00, Wed., 25 Feb. 0.0397 0.0343 0.0363
05:01-06:00, Wed., 25 Feb. 0.0388 0.0333 0.0359
04:01-05:00, Wed., 25 Feb. 0.0384 0.0343 0.0361
03:01-04:00, Wed., 25 Feb. 0.0377 0.0328 0.0358
02:01-03:00, Wed., 25 Feb. 0.0399 0.0332 0.0359
01:01-02:00, Wed., 25 Feb. 0.0415 0.0339 0.0360
00:01-01:00, Wed., 25 Feb. 0.0396 0.0338 0.0361
23:01-24:00, Tue., 24 Feb. 0.0383 0.0332 0.0358
22:01-23:00, Tue., 24 Feb. 0.0390 0.0338 0.0359
21:01-22:00, Tue., 24 Feb. 0.0388 0.0339 0.0359
20:01-21:00, Tue., 24 Feb. 0.0373 0.0342 0.0358
19:01-20:00, Tue., 24 Feb. 0.0389 0.0340 0.0358
18:01-19:00, Tue., 24 Feb. 0.0396 0.0329 0.0358
17:01-18:00, Tue., 24 Feb. 0.0395 0.0333 0.0360