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.

News about this monitoring post

We will suspend the provision of data in part or whole of the following time slots by interruption of power supply.
From 8:00 to 19:00 on Saturday, October 17,2020


We will suspend the provision of data in part or whole of the following time slots by relevant facilities due to maintenance and inspection of equipment.
From 9:00 to 13:00 on Tuesday, June 9,2020 Hachioji
From 13:00 to 17:00 on Tuesday,June 9,2020 Adachi
From 9:00 to 13:00 on ,Wednesday June 10,2020 Chofu
From 13:00 to 17:00 on ,Wednesday June 10,2020 Ota
From 9:00 to 13:00 on ,Thursday June 11,2020 Kodaira
From 13:00 to 17:00 on ,Thursday June 11,2020 Edogawa
From 9:00 to 13:00 on , Friday June 12,2020 Shinjuku

We will suspend the provision of data in part or whole of the following time slots by relevant facilities due to maintenance and inspection of equipment.
From 9:00 to 13:00 on Tuesday, December 10,2019 Hachioji
From 13:00 to 16:00 on Tuesday, December 10,2019 Adachi
From 9:00 to 13:00 on ,Wednesday December 11,2019 Chofu
From 13:00 to 16:00 on ,Wednesday December 11,2019 Ota
From 9:00 to 13:00 on ,Thursday December 12,2019 Kodaira
From 13:00 to 16:00 on ,Thursday December 12,2019 Edogawa
From 9:00 to 13:00 on , Friday December 13,2019 Shinjuku

We will suspend the provision of data in part or whole of the following time slots by relevant facilities due to maintenance.
From 8:00 to 19:00 on Saturday, November 9,2019
We will suspend the provision of data in part or whole of the following time slots by interruption of power supply and relevant facilities due to maintenance and inspection of equipment.
From 9:00 to 17:00 on Wednesday, August 26,2020 Shinjuku
From 9:00 to 17:00 on Thursday, August 27,2020 Shinjuku

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
22:01-23:00, Wed., 28 Oct. 0.0383 0.0342 0.0360
21:01-22:00, Wed., 28 Oct. 0.0388 0.0341 0.0363
20:01-21:00, Wed., 28 Oct. 0.0389 0.0337 0.0361
19:01-20:00, Wed., 28 Oct. 0.0389 0.0343 0.0362
18:01-19:00, Wed., 28 Oct. 0.0396 0.0342 0.0362
17:01-18:00, Wed., 28 Oct. 0.0393 0.0337 0.0362
16:01-17:00, Wed., 28 Oct. 0.0379 0.0336 0.0360
15:01-16:00, Wed., 28 Oct. 0.0392 0.0341 0.0359
14:01-15:00, Wed., 28 Oct. 0.0369 0.0336 0.0358
13:01-14:00, Wed., 28 Oct. 0.0398 0.0331 0.0359
12:01-13:00, Wed., 28 Oct. 0.0374 0.0342 0.0359
11:01-12:00, Wed., 28 Oct. 0.0391 0.0340 0.0362
10:01-11:00, Wed., 28 Oct. 0.0382 0.0329 0.0359
09:01-10:00, Wed., 28 Oct. 0.0386 0.0349 0.0365
08:01-09:00, Wed., 28 Oct. 0.0388 0.0349 0.0365
07:01-08:00, Wed., 28 Oct. 0.0390 0.0348 0.0366
06:01-07:00, Wed., 28 Oct. 0.0385 0.0344 0.0362
05:01-06:00, Wed., 28 Oct. 0.0395 0.0329 0.0363
04:01-05:00, Wed., 28 Oct. 0.0404 0.0334 0.0360
03:01-04:00, Wed., 28 Oct. 0.0396 0.0344 0.0363
02:01-03:00, Wed., 28 Oct. 0.0381 0.0346 0.0362
01:01-02:00, Wed., 28 Oct. 0.0401 0.0339 0.0362
00:01-01:00, Wed., 28 Oct. 0.0402 0.0331 0.0362
23:01-24:00, Tue., 27 Oct. 0.0391 0.0336 0.0359
22:01-23:00, Tue., 27 Oct. 0.0389 0.0334 0.0360
21:01-22:00, Tue., 27 Oct. 0.0374 0.0328 0.0359
20:01-21:00, Tue., 27 Oct. 0.0382 0.0340 0.0360
19:01-20:00, Tue., 27 Oct. 0.0389 0.0342 0.0360
18:01-19:00, Tue., 27 Oct. 0.0373 0.0330 0.0358
17:01-18:00, Tue., 27 Oct. 0.0398 0.0336 0.0361
16:01-17:00, Tue., 27 Oct. 0.0399 0.0331 0.0359
15:01-16:00, Tue., 27 Oct. 0.0406 0.0330 0.0359
14:01-15:00, Tue., 27 Oct. 0.0373 0.0338 0.0359
13:01-14:00, Tue., 27 Oct. 0.0413 0.0330 0.0361
12:01-13:00, Tue., 27 Oct. 0.0395 0.0343 0.0361
11:01-12:00, Tue., 27 Oct. 0.0395 0.0345 0.0365
10:01-11:00, Tue., 27 Oct. 0.0399 0.0342 0.0364
09:01-10:00, Tue., 27 Oct. 0.0383 0.0342 0.0362
08:01-09:00, Tue., 27 Oct. 0.0399 0.0342 0.0364
07:01-08:00, Tue., 27 Oct. 0.0395 0.0349 0.0366
06:01-07:00, Tue., 27 Oct. 0.0384 0.0339 0.0361
05:01-06:00, Tue., 27 Oct. 0.0392 0.0341 0.0362
04:01-05:00, Tue., 27 Oct. 0.0379 0.0343 0.0361
03:01-04:00, Tue., 27 Oct. 0.0381 0.0345 0.0363
02:01-03:00, Tue., 27 Oct. 0.0383 0.0345 0.0365
01:01-02:00, Tue., 27 Oct. 0.0398 0.0337 0.0366
00:01-01:00, Tue., 27 Oct. 0.0388 0.0336 0.0366
23:01-24:00, Mon., 26 Oct. 0.0404 0.0340 0.0366
22:01-23:00, Mon., 26 Oct. 0.0390 0.0340 0.0364
21:01-22:00, Mon., 26 Oct. 0.0387 0.0335 0.0361
20:01-21:00, Mon., 26 Oct. 0.0408 0.0337 0.0362
19:01-20:00, Mon., 26 Oct. 0.0387 0.0343 0.0360
18:01-19:00, Mon., 26 Oct. 0.0409 0.0342 0.0363
17:01-18:00, Mon., 26 Oct. 0.0392 0.0345 0.0364
16:01-17:00, Mon., 26 Oct. 0.0389 0.0338 0.0362
15:01-16:00, Mon., 26 Oct. 0.0699 0.0344 0.0367
14:01-15:00, Mon., 26 Oct. 0.0380 0.0341 0.0362
13:01-14:00, Mon., 26 Oct. 0.0409 0.0341 0.0365
12:01-13:00, Mon., 26 Oct. 0.0397 0.0345 0.0365
11:01-12:00, Mon., 26 Oct. 0.0401 0.0334 0.0366
10:01-11:00, Mon., 26 Oct. 0.0411 0.0348 0.0366
09:01-10:00, Mon., 26 Oct. 0.0406 0.0344 0.0370
08:01-09:00, Mon., 26 Oct. 0.0400 0.0347 0.0371
07:01-08:00, Mon., 26 Oct. 0.0412 0.0353 0.0373
06:01-07:00, Mon., 26 Oct. 0.0400 0.0351 0.0374
05:01-06:00, Mon., 26 Oct. 0.0423 0.0350 0.0375
04:01-05:00, Mon., 26 Oct. 0.0407 0.0348 0.0370
03:01-04:00, Mon., 26 Oct. 0.0403 0.0354 0.0374
02:01-03:00, Mon., 26 Oct. 0.0431 0.0353 0.0373
01:01-02:00, Mon., 26 Oct. 0.0406 0.0357 0.0375
00:01-01:00, Mon., 26 Oct. 0.0398 0.0354 0.0369
23:01-24:00, Sun., 25 Oct. 0.0401 0.0332 0.0366
22:01-23:00, Sun., 25 Oct. 0.0395 0.0344 0.0366
21:01-22:00, Sun., 25 Oct. 0.0382 0.0348 0.0364
20:01-21:00, Sun., 25 Oct. 0.0384 0.0350 0.0362
19:01-20:00, Sun., 25 Oct. 0.0387 0.0343 0.0365
18:01-19:00, Sun., 25 Oct. 0.0382 0.0340 0.0361
17:01-18:00, Sun., 25 Oct. 0.0414 0.0339 0.0363
16:01-17:00, Sun., 25 Oct. 0.0393 0.0342 0.0365
15:01-16:00, Sun., 25 Oct. 0.0413 0.0343 0.0366
14:01-15:00, Sun., 25 Oct. 0.0402 0.0351 0.0369
13:01-14:00, Sun., 25 Oct. 0.0398 0.0339 0.0368
12:01-13:00, Sun., 25 Oct. 0.0411 0.0343 0.0367
11:01-12:00, Sun., 25 Oct. 0.0402 0.0348 0.0366
10:01-11:00, Sun., 25 Oct. 0.0407 0.0346 0.0367
09:01-10:00, Sun., 25 Oct. 0.0394 0.0349 0.0366
08:01-09:00, Sun., 25 Oct. 0.0391 0.0345 0.0365
07:01-08:00, Sun., 25 Oct. 0.0398 0.0348 0.0366
06:01-07:00, Sun., 25 Oct. 0.0387 0.0340 0.0364
05:01-06:00, Sun., 25 Oct. 0.0391 0.0347 0.0365
04:01-05:00, Sun., 25 Oct. 0.0406 0.0343 0.0366
03:01-04:00, Sun., 25 Oct. 0.0416 0.0345 0.0364
02:01-03:00, Sun., 25 Oct. 0.0397 0.0344 0.0366
01:01-02:00, Sun., 25 Oct. 0.0400 0.0342 0.0366
00:01-01:00, Sun., 25 Oct. 0.0379 0.0343 0.0362
23:01-24:00, Sat., 24 Oct. 0.0409 0.0343 0.0366
22:01-23:00, Sat., 24 Oct. 0.0402 0.0340 0.0363
21:01-22:00, Sat., 24 Oct. 0.0403 0.0348 0.0368
20:01-21:00, Sat., 24 Oct. 0.0393 0.0341 0.0364
19:01-20:00, Sat., 24 Oct. 0.0391 0.0341 0.0363
18:01-19:00, Sat., 24 Oct. 0.0391 0.0343 0.0364
17:01-18:00, Sat., 24 Oct. 0.0404 0.0349 0.0366
16:01-17:00, Sat., 24 Oct. 0.0395 0.0338 0.0366
15:01-16:00, Sat., 24 Oct. 0.0395 0.0339 0.0362
14:01-15:00, Sat., 24 Oct. 0.0410 0.0343 0.0364
13:01-14:00, Sat., 24 Oct. 0.0392 0.0347 0.0368
12:01-13:00, Sat., 24 Oct. 0.0403 0.0347 0.0365
11:01-12:00, Sat., 24 Oct. 0.0383 0.0340 0.0364
10:01-11:00, Sat., 24 Oct. 0.0412 0.0345 0.0365
09:01-10:00, Sat., 24 Oct. 0.0399 0.0343 0.0363
08:01-09:00, Sat., 24 Oct. 0.0409 0.0341 0.0365
07:01-08:00, Sat., 24 Oct. 0.0381 0.0340 0.0362
06:01-07:00, Sat., 24 Oct. 0.0381 0.0334 0.0363
05:01-06:00, Sat., 24 Oct. 0.0389 0.0344 0.0364
04:01-05:00, Sat., 24 Oct. 0.0385 0.0344 0.0364
03:01-04:00, Sat., 24 Oct. 0.0390 0.0341 0.0362
02:01-03:00, Sat., 24 Oct. 0.0393 0.0339 0.0362
01:01-02:00, Sat., 24 Oct. 0.0418 0.0326 0.0362
00:01-01:00, Sat., 24 Oct. 0.0375 0.0339 0.0360
23:01-24:00, Fri., 23 Oct. 0.0392 0.0339 0.0360
22:01-23:00, Fri., 23 Oct. 0.0392 0.0338 0.0363
21:01-22:00, Fri., 23 Oct. 0.0386 0.0342 0.0361
20:01-21:00, Fri., 23 Oct. 0.0384 0.0339 0.0361
19:01-20:00, Fri., 23 Oct. 0.0392 0.0338 0.0362
18:01-19:00, Fri., 23 Oct. 0.0391 0.0345 0.0365
17:01-18:00, Fri., 23 Oct. 0.0416 0.0348 0.0372
16:01-17:00, Fri., 23 Oct. 0.0440 0.0364 0.0397
15:01-16:00, Fri., 23 Oct. 0.0442 0.0370 0.0409
14:01-15:00, Fri., 23 Oct. 0.0462 0.0388 0.0421
13:01-14:00, Fri., 23 Oct. 0.0471 0.0366 0.0423
12:01-13:00, Fri., 23 Oct. 0.0453 0.0359 0.0393
11:01-12:00, Fri., 23 Oct. 0.0450 0.0366 0.0402
10:01-11:00, Fri., 23 Oct. 0.0481 0.0393 0.0432
09:01-10:00, Fri., 23 Oct. 0.0427 0.0344 0.0383
08:01-09:00, Fri., 23 Oct. 0.0382 0.0340 0.0363
07:01-08:00, Fri., 23 Oct. 0.0397 0.0343 0.0364
06:01-07:00, Fri., 23 Oct. 0.0395 0.0335 0.0362
05:01-06:00, Fri., 23 Oct. 0.0390 0.0339 0.0363
04:01-05:00, Fri., 23 Oct. 0.0416 0.0339 0.0362
03:01-04:00, Fri., 23 Oct. 0.0400 0.0338 0.0363
02:01-03:00, Fri., 23 Oct. 0.0383 0.0345 0.0361
01:01-02:00, Fri., 23 Oct. 0.0391 0.0345 0.0366
00:01-01:00, Fri., 23 Oct. 0.0397 0.0349 0.0366
23:01-24:00, Thu., 22 Oct. 0.0399 0.0347 0.0363
22:01-23:00, Thu., 22 Oct. 0.0387 0.0334 0.0361
21:01-22:00, Thu., 22 Oct. 0.0391 0.0334 0.0361
20:01-21:00, Thu., 22 Oct. 0.0397 0.0344 0.0364
19:01-20:00, Thu., 22 Oct. 0.0386 0.0342 0.0362
18:01-19:00, Thu., 22 Oct. 0.0397 0.0343 0.0361
17:01-18:00, Thu., 22 Oct. 0.0394 0.0341 0.0362
16:01-17:00, Thu., 22 Oct. 0.0397 0.0342 0.0362
15:01-16:00, Thu., 22 Oct. 0.0383 0.0338 0.0360
14:01-15:00, Thu., 22 Oct. 0.0412 0.0333 0.0360
13:01-14:00, Thu., 22 Oct. 0.0387 0.0339 0.0360
12:01-13:00, Thu., 22 Oct. 0.0389 0.0337 0.0362
11:01-12:00, Thu., 22 Oct. 0.0383 0.0344 0.0361
10:01-11:00, Thu., 22 Oct. 0.0392 0.0341 0.0363
09:01-10:00, Thu., 22 Oct. 0.0388 0.0338 0.0361
08:01-09:00, Thu., 22 Oct. 0.0395 0.0341 0.0362
07:01-08:00, Thu., 22 Oct. 0.0384 0.0338 0.0360
06:01-07:00, Thu., 22 Oct. 0.0395 0.0340 0.0364
05:01-06:00, Thu., 22 Oct. 0.0402 0.0349 0.0367
04:01-05:00, Thu., 22 Oct. 0.0405 0.0346 0.0365
03:01-04:00, Thu., 22 Oct. 0.0384 0.0335 0.0362
02:01-03:00, Thu., 22 Oct. 0.0396 0.0342 0.0363
01:01-02:00, Thu., 22 Oct. 0.0392 0.0329 0.0364
00:01-01:00, Thu., 22 Oct. 0.0400 0.0341 0.0364
23:01-24:00, Wed., 21 Oct. 0.0392 0.0345 0.0363
22:01-23:00, Wed., 21 Oct. 0.0386 0.0334 0.0360
21:01-22:00, Wed., 21 Oct. 0.0382 0.0341 0.0359
20:01-21:00, Wed., 21 Oct. 0.0377 0.0342 0.0360
19:01-20:00, Wed., 21 Oct. 0.0382 0.0333 0.0358
18:01-19:00, Wed., 21 Oct. 0.0372 0.0338 0.0360
17:01-18:00, Wed., 21 Oct. 0.0382 0.0343 0.0357
16:01-17:00, Wed., 21 Oct. 0.0375 0.0333 0.0357
15:01-16:00, Wed., 21 Oct. 0.0379 0.0336 0.0359
14:01-15:00, Wed., 21 Oct. 0.0388 0.0344 0.0361
13:01-14:00, Wed., 21 Oct. 0.0391 0.0342 0.0360
12:01-13:00, Wed., 21 Oct. 0.0393 0.0338 0.0359
11:01-12:00, Wed., 21 Oct. 0.0397 0.0342 0.0361
10:01-11:00, Wed., 21 Oct. 0.0382 0.0342 0.0359
09:01-10:00, Wed., 21 Oct. 0.0400 0.0343 0.0366
08:01-09:00, Wed., 21 Oct. 0.0395 0.0334 0.0362
07:01-08:00, Wed., 21 Oct. 0.0395 0.0345 0.0365
06:01-07:00, Wed., 21 Oct. 0.0388 0.0343 0.0366
05:01-06:00, Wed., 21 Oct. 0.0386 0.0338 0.0365
04:01-05:00, Wed., 21 Oct. 0.0407 0.0351 0.0368
03:01-04:00, Wed., 21 Oct. 0.0403 0.0341 0.0367
02:01-03:00, Wed., 21 Oct. 0.0400 0.0336 0.0367
01:01-02:00, Wed., 21 Oct. 0.0383 0.0338 0.0363
00:01-01:00, Wed., 21 Oct. 0.0387 0.0341 0.0362
23:01-24:00, Tue., 20 Oct. 0.0393 0.0339 0.0362
22:01-23:00, Tue., 20 Oct. 0.0390 0.0336 0.0360
21:01-22:00, Tue., 20 Oct. 0.0392 0.0339 0.0361
20:01-21:00, Tue., 20 Oct. 0.0389 0.0330 0.0359
19:01-20:00, Tue., 20 Oct. 0.0387 0.0341 0.0360
18:01-19:00, Tue., 20 Oct. 0.0385 0.0329 0.0360
17:01-18:00, Tue., 20 Oct. 0.0396 0.0336 0.0359
16:01-17:00, Tue., 20 Oct. 0.0372 0.0329 0.0356
15:01-16:00, Tue., 20 Oct. 0.0396 0.0343 0.0362
14:01-15:00, Tue., 20 Oct. 0.0390 0.0341 0.0360
13:01-14:00, Tue., 20 Oct. 0.0385 0.0338 0.0362
12:01-13:00, Tue., 20 Oct. 0.0383 0.0336 0.0358
11:01-12:00, Tue., 20 Oct. 0.0390 0.0337 0.0361
10:01-11:00, Tue., 20 Oct. 0.0386 0.0340 0.0358
09:01-10:00, Tue., 20 Oct. 0.0408 0.0342 0.0362
08:01-09:00, Tue., 20 Oct. 0.0387 0.0342 0.0364
07:01-08:00, Tue., 20 Oct. 0.0385 0.0339 0.0366
06:01-07:00, Tue., 20 Oct. 0.0393 0.0346 0.0366
05:01-06:00, Tue., 20 Oct. 0.0393 0.0341 0.0366
04:01-05:00, Tue., 20 Oct. 0.0398 0.0344 0.0367
03:01-04:00, Tue., 20 Oct. 0.0393 0.0351 0.0367
02:01-03:00, Tue., 20 Oct. 0.0399 0.0333 0.0364
01:01-02:00, Tue., 20 Oct. 0.0387 0.0335 0.0362
00:01-01:00, Tue., 20 Oct. 0.0397 0.0344 0.0362
23:01-24:00, Mon., 19 Oct. 0.0412 0.0338 0.0360
22:01-23:00, Mon., 19 Oct. 0.0389 0.0338 0.0360
21:01-22:00, Mon., 19 Oct. 0.0400 0.0342 0.0360
20:01-21:00, Mon., 19 Oct. 0.0398 0.0347 0.0368
19:01-20:00, Mon., 19 Oct. 0.0426 0.0360 0.0387
18:01-19:00, Mon., 19 Oct. 0.0447 0.0374 0.0412
17:01-18:00, Mon., 19 Oct. 0.0463 0.0399 0.0428
16:01-17:00, Mon., 19 Oct. 0.0465 0.0389 0.0440
15:01-16:00, Mon., 19 Oct. 0.0467 0.0397 0.0431
14:01-15:00, Mon., 19 Oct. 0.0449 0.0384 0.0416
13:01-14:00, Mon., 19 Oct. 0.0449 0.0371 0.0409
12:01-13:00, Mon., 19 Oct. 0.0424 0.0364 0.0391
11:01-12:00, Mon., 19 Oct. 0.0407 0.0344 0.0365
10:01-11:00, Mon., 19 Oct. 0.0402 0.0343 0.0367
09:01-10:00, Mon., 19 Oct. 0.0406 0.0354 0.0371
08:01-09:00, Mon., 19 Oct. 0.0386 0.0348 0.0364
07:01-08:00, Mon., 19 Oct. 0.0404 0.0348 0.0368
06:01-07:00, Mon., 19 Oct. 0.0412 0.0345 0.0366
05:01-06:00, Mon., 19 Oct. 0.0401 0.0339 0.0368
04:01-05:00, Mon., 19 Oct. 0.0398 0.0343 0.0366
03:01-04:00, Mon., 19 Oct. 0.0406 0.0350 0.0368
02:01-03:00, Mon., 19 Oct. 0.0389 0.0346 0.0367
01:01-02:00, Mon., 19 Oct. 0.0405 0.0341 0.0369
00:01-01:00, Mon., 19 Oct. 0.0388 0.0348 0.0364
23:01-24:00, Sun., 18 Oct. 0.0399 0.0334 0.0367