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
04:01-05:00, Mon., 22 Jun. 0.0384 0.0329 0.0353
03:01-04:00, Mon., 22 Jun. 0.0377 0.0329 0.0352
02:01-03:00, Mon., 22 Jun. 0.0383 0.0331 0.0353
01:01-02:00, Mon., 22 Jun. 0.0379 0.0327 0.0354
00:01-01:00, Mon., 22 Jun. 0.0383 0.0338 0.0360
23:01-24:00, Sun., 21 Jun. 0.0437 0.0353 0.0380
22:01-23:00, Sun., 21 Jun. 0.0441 0.0361 0.0396
21:01-22:00, Sun., 21 Jun. 0.0380 0.0335 0.0356
20:01-21:00, Sun., 21 Jun. 0.0386 0.0341 0.0357
19:01-20:00, Sun., 21 Jun. 0.0383 0.0333 0.0355
18:01-19:00, Sun., 21 Jun. 0.0377 0.0336 0.0355
17:01-18:00, Sun., 21 Jun. 0.0392 0.0334 0.0356
16:01-17:00, Sun., 21 Jun. 0.0379 0.0332 0.0354
15:01-16:00, Sun., 21 Jun. 0.0373 0.0333 0.0354
14:01-15:00, Sun., 21 Jun. 0.0369 0.0334 0.0353
13:01-14:00, Sun., 21 Jun. 0.0378 0.0335 0.0352
12:01-13:00, Sun., 21 Jun. 0.0371 0.0334 0.0350
11:01-12:00, Sun., 21 Jun. 0.0397 0.0330 0.0353
10:01-11:00, Sun., 21 Jun. 0.0372 0.0339 0.0354
09:01-10:00, Sun., 21 Jun. 0.0368 0.0333 0.0353
08:01-09:00, Sun., 21 Jun. 0.0382 0.0336 0.0354
07:01-08:00, Sun., 21 Jun. 0.0389 0.0344 0.0365
06:01-07:00, Sun., 21 Jun. 0.0412 0.0353 0.0377
05:01-06:00, Sun., 21 Jun. 0.0474 0.0367 0.0417
04:01-05:00, Sun., 21 Jun. 0.0500 0.0362 0.0438
03:01-04:00, Sun., 21 Jun. 0.0445 0.0366 0.0397
02:01-03:00, Sun., 21 Jun. 0.0467 0.0387 0.0424
01:01-02:00, Sun., 21 Jun. 0.0458 0.0384 0.0422
00:01-01:00, Sun., 21 Jun. 0.0445 0.0380 0.0412
23:01-24:00, Sat., 20 Jun. 0.0467 0.0378 0.0415
22:01-23:00, Sat., 20 Jun. 0.0469 0.0394 0.0428
21:01-22:00, Sat., 20 Jun. 0.0497 0.0425 0.0463
20:01-21:00, Sat., 20 Jun. 0.0497 0.0414 0.0457
19:01-20:00, Sat., 20 Jun. 0.0470 0.0400 0.0438
18:01-19:00, Sat., 20 Jun. 0.0469 0.0407 0.0434
17:01-18:00, Sat., 20 Jun. 0.0465 0.0400 0.0438
16:01-17:00, Sat., 20 Jun. 0.0468 0.0399 0.0430
15:01-16:00, Sat., 20 Jun. 0.0464 0.0395 0.0427
14:01-15:00, Sat., 20 Jun. 0.0462 0.0361 0.0412
13:01-14:00, Sat., 20 Jun. 0.0408 0.0336 0.0370
12:01-13:00, Sat., 20 Jun. 0.0409 0.0353 0.0374
11:01-12:00, Sat., 20 Jun. 0.0415 0.0335 0.0368
10:01-11:00, Sat., 20 Jun. 0.0379 0.0338 0.0360
09:01-10:00, Sat., 20 Jun. 0.0390 0.0327 0.0351
08:01-09:00, Sat., 20 Jun. 0.0370 0.0326 0.0351
07:01-08:00, Sat., 20 Jun. 0.0383 0.0331 0.0352
06:01-07:00, Sat., 20 Jun. 0.0371 0.0322 0.0352
05:01-06:00, Sat., 20 Jun. 0.0368 0.0329 0.0350
04:01-05:00, Sat., 20 Jun. 0.0381 0.0321 0.0352
03:01-04:00, Sat., 20 Jun. 0.0369 0.0327 0.0352
02:01-03:00, Sat., 20 Jun. 0.0373 0.0331 0.0354
01:01-02:00, Sat., 20 Jun. 0.0370 0.0331 0.0353
00:01-01:00, Sat., 20 Jun. 0.0368 0.0334 0.0353
23:01-24:00, Fri., 19 Jun. 0.0374 0.0336 0.0355
22:01-23:00, Fri., 19 Jun. 0.0373 0.0324 0.0353
21:01-22:00, Fri., 19 Jun. 0.0380 0.0330 0.0353
20:01-21:00, Fri., 19 Jun. 0.0386 0.0337 0.0359
19:01-20:00, Fri., 19 Jun. 0.0368 0.0328 0.0350
18:01-19:00, Fri., 19 Jun. 0.0408 0.0334 0.0355
17:01-18:00, Fri., 19 Jun. 0.0370 0.0334 0.0354
16:01-17:00, Fri., 19 Jun. 0.0391 0.0326 0.0356
15:01-16:00, Fri., 19 Jun. 0.0374 0.0331 0.0355
14:01-15:00, Fri., 19 Jun. 0.0372 0.0338 0.0355
13:01-14:00, Fri., 19 Jun. 0.0387 0.0339 0.0356
12:01-13:00, Fri., 19 Jun. 0.0375 0.0333 0.0352
11:01-12:00, Fri., 19 Jun. 0.0371 0.0330 0.0349
10:01-11:00, Fri., 19 Jun. 0.0372 0.0336 0.0354
09:01-10:00, Fri., 19 Jun. 0.0373 0.0339 0.0352
08:01-09:00, Fri., 19 Jun. 0.0377 0.0319 0.0353
07:01-08:00, Fri., 19 Jun. 0.0372 0.0331 0.0354
06:01-07:00, Fri., 19 Jun. 0.0370 0.0330 0.0353
05:01-06:00, Fri., 19 Jun. 0.0393 0.0331 0.0355
04:01-05:00, Fri., 19 Jun. 0.0369 0.0331 0.0351
03:01-04:00, Fri., 19 Jun. 0.0374 0.0330 0.0353
02:01-03:00, Fri., 19 Jun. 0.0387 0.0332 0.0354
01:01-02:00, Fri., 19 Jun. 0.0381 0.0327 0.0350
00:01-01:00, Fri., 19 Jun. 0.0364 0.0332 0.0350
23:01-24:00, Thu., 18 Jun. 0.0372 0.0328 0.0352
22:01-23:00, Thu., 18 Jun. 0.0368 0.0328 0.0350
21:01-22:00, Thu., 18 Jun. 0.0375 0.0329 0.0350
20:01-21:00, Thu., 18 Jun. 0.0381 0.0327 0.0349
19:01-20:00, Thu., 18 Jun. 0.0367 0.0325 0.0350
18:01-19:00, Thu., 18 Jun. 0.0371 0.0328 0.0351
17:01-18:00, Thu., 18 Jun. 0.0372 0.0333 0.0353
16:01-17:00, Thu., 18 Jun. 0.0373 0.0332 0.0350
15:01-16:00, Thu., 18 Jun. 0.0373 0.0329 0.0351
14:01-15:00, Thu., 18 Jun. 0.0373 0.0339 0.0355
13:01-14:00, Thu., 18 Jun. 0.0390 0.0336 0.0360
12:01-13:00, Thu., 18 Jun. 0.0408 0.0346 0.0369
11:01-12:00, Thu., 18 Jun. 0.0412 0.0342 0.0376
10:01-11:00, Thu., 18 Jun. 0.0416 0.0356 0.0385
09:01-10:00, Thu., 18 Jun. 0.0426 0.0358 0.0395
08:01-09:00, Thu., 18 Jun. 0.0442 0.0369 0.0406
07:01-08:00, Thu., 18 Jun. 0.0448 0.0374 0.0412
06:01-07:00, Thu., 18 Jun. 0.0443 0.0368 0.0402
05:01-06:00, Thu., 18 Jun. 0.0438 0.0373 0.0413
04:01-05:00, Thu., 18 Jun. 0.0441 0.0367 0.0407
03:01-04:00, Thu., 18 Jun. 0.0435 0.0359 0.0387
02:01-03:00, Thu., 18 Jun. 0.0422 0.0351 0.0381
01:01-02:00, Thu., 18 Jun. 0.0422 0.0365 0.0383
00:01-01:00, Thu., 18 Jun. 0.0385 0.0341 0.0364
23:01-24:00, Wed., 17 Jun. 0.0387 0.0332 0.0358
22:01-23:00, Wed., 17 Jun. 0.0390 0.0338 0.0357
21:01-22:00, Wed., 17 Jun. 0.0378 0.0332 0.0353
20:01-21:00, Wed., 17 Jun. 0.0389 0.0334 0.0354
19:01-20:00, Wed., 17 Jun. 0.0383 0.0335 0.0354
18:01-19:00, Wed., 17 Jun. 0.0383 0.0326 0.0355
17:01-18:00, Wed., 17 Jun. 0.0382 0.0333 0.0355
16:01-17:00, Wed., 17 Jun. 0.0373 0.0329 0.0354
15:01-16:00, Wed., 17 Jun. 0.0372 0.0320 0.0353
14:01-15:00, Wed., 17 Jun. 0.0380 0.0340 0.0354
13:01-14:00, Wed., 17 Jun. 0.0377 0.0336 0.0355
12:01-13:00, Wed., 17 Jun. 0.0376 0.0327 0.0351
11:01-12:00, Wed., 17 Jun. 0.0372 0.0332 0.0354
10:01-11:00, Wed., 17 Jun. 0.0379 0.0332 0.0353
09:01-10:00, Wed., 17 Jun. 0.0385 0.0326 0.0353
08:01-09:00, Wed., 17 Jun. 0.0379 0.0326 0.0353
07:01-08:00, Wed., 17 Jun. 0.0384 0.0332 0.0353
06:01-07:00, Wed., 17 Jun. 0.0381 0.0339 0.0357
05:01-06:00, Wed., 17 Jun. 0.0385 0.0322 0.0355
04:01-05:00, Wed., 17 Jun. 0.0370 0.0336 0.0354
03:01-04:00, Wed., 17 Jun. 0.0380 0.0338 0.0357
02:01-03:00, Wed., 17 Jun. 0.0376 0.0328 0.0353
01:01-02:00, Wed., 17 Jun. 0.0373 0.0337 0.0355
00:01-01:00, Wed., 17 Jun. 0.0387 0.0329 0.0354
23:01-24:00, Tue., 16 Jun. 0.0375 0.0332 0.0352
22:01-23:00, Tue., 16 Jun. 0.0379 0.0327 0.0352
21:01-22:00, Tue., 16 Jun. 0.0379 0.0336 0.0358
20:01-21:00, Tue., 16 Jun. 0.0396 0.0337 0.0357
19:01-20:00, Tue., 16 Jun. 0.0388 0.0334 0.0357
18:01-19:00, Tue., 16 Jun. 0.0372 0.0333 0.0353
17:01-18:00, Tue., 16 Jun. 0.0386 0.0327 0.0353
16:01-17:00, Tue., 16 Jun. 0.0373 0.0341 0.0355
15:01-16:00, Tue., 16 Jun. 0.0376 0.0341 0.0356
14:01-15:00, Tue., 16 Jun. 0.0385 0.0336 0.0357
13:01-14:00, Tue., 16 Jun. 0.0373 0.0329 0.0355
12:01-13:00, Tue., 16 Jun. 0.0371 0.0331 0.0352
11:01-12:00, Tue., 16 Jun. 0.0393 0.0333 0.0353
10:01-11:00, Tue., 16 Jun. 0.0391 0.0326 0.0357
09:01-10:00, Tue., 16 Jun. 0.0378 0.0334 0.0357
08:01-09:00, Tue., 16 Jun. 0.0376 0.0332 0.0354
07:01-08:00, Tue., 16 Jun. 0.0393 0.0341 0.0359
06:01-07:00, Tue., 16 Jun. 0.0389 0.0339 0.0359
05:01-06:00, Tue., 16 Jun. 0.0399 0.0337 0.0358
04:01-05:00, Tue., 16 Jun. 0.0382 0.0327 0.0352
03:01-04:00, Tue., 16 Jun. 0.0374 0.0330 0.0352
02:01-03:00, Tue., 16 Jun. 0.0396 0.0328 0.0354
01:01-02:00, Tue., 16 Jun. 0.0379 0.0335 0.0353
00:01-01:00, Tue., 16 Jun. 0.0370 0.0335 0.0351
23:01-24:00, Mon., 15 Jun. 0.0372 0.0321 0.0351
22:01-23:00, Mon., 15 Jun. 0.0373 0.0328 0.0351
21:01-22:00, Mon., 15 Jun. 0.0374 0.0327 0.0353
20:01-21:00, Mon., 15 Jun. 0.0369 0.0327 0.0352
19:01-20:00, Mon., 15 Jun. 0.0372 0.0332 0.0355
18:01-19:00, Mon., 15 Jun. 0.0378 0.0330 0.0352
17:01-18:00, Mon., 15 Jun. 0.0387 0.0327 0.0353
16:01-17:00, Mon., 15 Jun. 0.0377 0.0331 0.0352
15:01-16:00, Mon., 15 Jun. 0.0385 0.0326 0.0354
14:01-15:00, Mon., 15 Jun. 0.0372 0.0331 0.0353
13:01-14:00, Mon., 15 Jun. 0.0385 0.0328 0.0353
12:01-13:00, Mon., 15 Jun. 0.0397 0.0335 0.0358
11:01-12:00, Mon., 15 Jun. 0.0389 0.0344 0.0359
10:01-11:00, Mon., 15 Jun. 0.0398 0.0344 0.0365
09:01-10:00, Mon., 15 Jun. 0.0421 0.0359 0.0378
08:01-09:00, Mon., 15 Jun. 0.0419 0.0355 0.0380
07:01-08:00, Mon., 15 Jun. 0.0441 0.0367 0.0403
06:01-07:00, Mon., 15 Jun. 0.0452 0.0391 0.0419
05:01-06:00, Mon., 15 Jun. 0.0458 0.0375 0.0422
04:01-05:00, Mon., 15 Jun. 0.0457 0.0379 0.0427
03:01-04:00, Mon., 15 Jun. 0.0435 0.0374 0.0405
02:01-03:00, Mon., 15 Jun. 0.0416 0.0359 0.0381
01:01-02:00, Mon., 15 Jun. 0.0418 0.0357 0.0379
00:01-01:00, Mon., 15 Jun. 0.0425 0.0352 0.0383
23:01-24:00, Sun., 14 Jun. 0.0373 0.0332 0.0357
22:01-23:00, Sun., 14 Jun. 0.0387 0.0335 0.0355
21:01-22:00, Sun., 14 Jun. 0.0374 0.0337 0.0354
20:01-21:00, Sun., 14 Jun. 0.0377 0.0339 0.0356
19:01-20:00, Sun., 14 Jun. 0.0378 0.0333 0.0355
18:01-19:00, Sun., 14 Jun. 0.0391 0.0331 0.0357
17:01-18:00, Sun., 14 Jun. 0.0375 0.0340 0.0356
16:01-17:00, Sun., 14 Jun. 0.0380 0.0337 0.0354
15:01-16:00, Sun., 14 Jun. 0.0389 0.0334 0.0356
14:01-15:00, Sun., 14 Jun. 0.0383 0.0335 0.0354
13:01-14:00, Sun., 14 Jun. 0.0384 0.0338 0.0358
12:01-13:00, Sun., 14 Jun. 0.0374 0.0332 0.0355
11:01-12:00, Sun., 14 Jun. 0.0395 0.0337 0.0358
10:01-11:00, Sun., 14 Jun. 0.0383 0.0333 0.0357
09:01-10:00, Sun., 14 Jun. 0.0396 0.0339 0.0361
08:01-09:00, Sun., 14 Jun. 0.0395 0.0345 0.0363
07:01-08:00, Sun., 14 Jun. 0.0394 0.0342 0.0361
06:01-07:00, Sun., 14 Jun. 0.0382 0.0341 0.0359
05:01-06:00, Sun., 14 Jun. 0.0386 0.0338 0.0361
04:01-05:00, Sun., 14 Jun. 0.0394 0.0337 0.0362
03:01-04:00, Sun., 14 Jun. 0.0384 0.0337 0.0360
02:01-03:00, Sun., 14 Jun. 0.0393 0.0343 0.0363
01:01-02:00, Sun., 14 Jun. 0.0387 0.0330 0.0357
00:01-01:00, Sun., 14 Jun. 0.0376 0.0339 0.0356
23:01-24:00, Sat., 13 Jun. 0.0376 0.0333 0.0354
22:01-23:00, Sat., 13 Jun. 0.0388 0.0337 0.0356
21:01-22:00, Sat., 13 Jun. 0.0387 0.0336 0.0357
20:01-21:00, Sat., 13 Jun. 0.0386 0.0337 0.0358
19:01-20:00, Sat., 13 Jun. 0.0387 0.0344 0.0359
18:01-19:00, Sat., 13 Jun. 0.0383 0.0331 0.0357
17:01-18:00, Sat., 13 Jun. 0.0382 0.0329 0.0357
16:01-17:00, Sat., 13 Jun. 0.0395 0.0343 0.0361
15:01-16:00, Sat., 13 Jun. 0.0380 0.0343 0.0361
14:01-15:00, Sat., 13 Jun. 0.0381 0.0343 0.0360
13:01-14:00, Sat., 13 Jun. 0.0392 0.0334 0.0360
12:01-13:00, Sat., 13 Jun. 0.0397 0.0336 0.0357
11:01-12:00, Sat., 13 Jun. 0.0403 0.0325 0.0358
10:01-11:00, Sat., 13 Jun. 0.0381 0.0340 0.0359
09:01-10:00, Sat., 13 Jun. 0.0397 0.0341 0.0363
08:01-09:00, Sat., 13 Jun. 0.0384 0.0334 0.0358
07:01-08:00, Sat., 13 Jun. 0.0396 0.0341 0.0358
06:01-07:00, Sat., 13 Jun. 0.0392 0.0343 0.0362
05:01-06:00, Sat., 13 Jun. 0.0402 0.0341 0.0361
04:01-05:00, Sat., 13 Jun. 0.0392 0.0341 0.0361
03:01-04:00, Sat., 13 Jun. 0.0382 0.0336 0.0359
02:01-03:00, Sat., 13 Jun. 0.0391 0.0330 0.0359
01:01-02:00, Sat., 13 Jun. 0.0376 0.0333 0.0356
00:01-01:00, Sat., 13 Jun. 0.0379 0.0331 0.0354
23:01-24:00, Fri., 12 Jun. 0.0391 0.0340 0.0355
22:01-23:00, Fri., 12 Jun. 0.0380 0.0335 0.0356
21:01-22:00, Fri., 12 Jun. 0.0391 0.0332 0.0356
20:01-21:00, Fri., 12 Jun. 0.0384 0.0330 0.0358
19:01-20:00, Fri., 12 Jun. 0.0403 0.0345 0.0364
18:01-19:00, Fri., 12 Jun. 0.0393 0.0341 0.0362
17:01-18:00, Fri., 12 Jun. 0.0378 0.0336 0.0360
16:01-17:00, Fri., 12 Jun. 0.0431 0.0347 0.0375
15:01-16:00, Fri., 12 Jun. 0.0477 0.0379 0.0429
14:01-15:00, Fri., 12 Jun. 0.0515 0.0428 0.0483
13:01-14:00, Fri., 12 Jun. 0.0479 0.0343 0.0401
12:01-13:00, Fri., 12 Jun. 0.0372 0.0339 0.0357
11:01-12:00, Fri., 12 Jun. 0.0372 0.0332 0.0355
10:01-11:00, Fri., 12 Jun. 0.0376 0.0340 0.0358
09:01-10:00, Fri., 12 Jun. 0.0394 0.0339 0.0356
08:01-09:00, Fri., 12 Jun. 0.0380 0.0335 0.0358
07:01-08:00, Fri., 12 Jun. 0.0374 0.0334 0.0356
06:01-07:00, Fri., 12 Jun. 0.0389 0.0343 0.0359
05:01-06:00, Fri., 12 Jun. 0.0373 0.0333 0.0356