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
15:01-16:00, Sun., 23 Feb. 0.0404 0.0339 0.0356
14:01-15:00, Sun., 23 Feb. 0.0380 0.0333 0.0356
13:01-14:00, Sun., 23 Feb. 0.0385 0.0334 0.0358
12:01-13:00, Sun., 23 Feb. 0.0374 0.0338 0.0357
11:01-12:00, Sun., 23 Feb. 0.0399 0.0335 0.0359
10:01-11:00, Sun., 23 Feb. 0.0374 0.0321 0.0354
09:01-10:00, Sun., 23 Feb. 0.0377 0.0336 0.0355
08:01-09:00, Sun., 23 Feb. 0.0386 0.0338 0.0357
07:01-08:00, Sun., 23 Feb. 0.0381 0.0335 0.0357
06:01-07:00, Sun., 23 Feb. 0.0381 0.0335 0.0356
05:01-06:00, Sun., 23 Feb. 0.0384 0.0337 0.0357
04:01-05:00, Sun., 23 Feb. 0.0376 0.0342 0.0356
03:01-04:00, Sun., 23 Feb. 0.0385 0.0339 0.0360
02:01-03:00, Sun., 23 Feb. 0.0395 0.0327 0.0352
01:01-02:00, Sun., 23 Feb. 0.0373 0.0340 0.0356
00:01-01:00, Sun., 23 Feb. 0.0377 0.0331 0.0353
23:01-24:00, Sat., 22 Feb. 0.0376 0.0322 0.0355
22:01-23:00, Sat., 22 Feb. 0.0384 0.0340 0.0358
21:01-22:00, Sat., 22 Feb. 0.0376 0.0332 0.0356
20:01-21:00, Sat., 22 Feb. 0.0393 0.0329 0.0355
19:01-20:00, Sat., 22 Feb. 0.0391 0.0333 0.0354
18:01-19:00, Sat., 22 Feb. 0.0382 0.0337 0.0357
17:01-18:00, Sat., 22 Feb. 0.0372 0.0329 0.0357
16:01-17:00, Sat., 22 Feb. 0.0384 0.0337 0.0358
15:01-16:00, Sat., 22 Feb. 0.0386 0.0338 0.0358
14:01-15:00, Sat., 22 Feb. 0.0383 0.0339 0.0359
13:01-14:00, Sat., 22 Feb. 0.0411 0.0341 0.0361
12:01-13:00, Sat., 22 Feb. 0.0392 0.0337 0.0359
11:01-12:00, Sat., 22 Feb. 0.0388 0.0338 0.0360
10:01-11:00, Sat., 22 Feb. 0.0376 0.0341 0.0358
09:01-10:00, Sat., 22 Feb. 0.0398 0.0334 0.0358
08:01-09:00, Sat., 22 Feb. 0.0371 0.0337 0.0354
07:01-08:00, Sat., 22 Feb. 0.0374 0.0340 0.0358
06:01-07:00, Sat., 22 Feb. 0.0378 0.0335 0.0356
05:01-06:00, Sat., 22 Feb. 0.0409 0.0330 0.0356
04:01-05:00, Sat., 22 Feb. 0.0378 0.0333 0.0355
03:01-04:00, Sat., 22 Feb. 0.0391 0.0331 0.0357
02:01-03:00, Sat., 22 Feb. 0.0373 0.0329 0.0355
01:01-02:00, Sat., 22 Feb. 0.0374 0.0342 0.0357
00:01-01:00, Sat., 22 Feb. 0.0382 0.0340 0.0355
23:01-24:00, Fri., 21 Feb. 0.0371 0.0339 0.0356
22:01-23:00, Fri., 21 Feb. 0.0373 0.0334 0.0355
21:01-22:00, Fri., 21 Feb. 0.0373 0.0337 0.0355
20:01-21:00, Fri., 21 Feb. 0.0377 0.0331 0.0357
19:01-20:00, Fri., 21 Feb. 0.0382 0.0325 0.0356
18:01-19:00, Fri., 21 Feb. 0.0381 0.0337 0.0357
17:01-18:00, Fri., 21 Feb. 0.0371 0.0339 0.0356
16:01-17:00, Fri., 21 Feb. 0.0378 0.0332 0.0358
15:01-16:00, Fri., 21 Feb. 0.0401 0.0334 0.0359
14:01-15:00, Fri., 21 Feb. 0.0397 0.0337 0.0361
13:01-14:00, Fri., 21 Feb. 0.0390 0.0337 0.0360
12:01-13:00, Fri., 21 Feb. 0.0397 0.0338 0.0359
11:01-12:00, Fri., 21 Feb. 0.0401 0.0340 0.0359
10:01-11:00, Fri., 21 Feb. 0.0391 0.0334 0.0357
09:01-10:00, Fri., 21 Feb. 0.0381 0.0335 0.0356
08:01-09:00, Fri., 21 Feb. 0.0371 0.0332 0.0357
07:01-08:00, Fri., 21 Feb. 0.0373 0.0326 0.0357
06:01-07:00, Fri., 21 Feb. 0.0389 0.0336 0.0358
05:01-06:00, Fri., 21 Feb. 0.0381 0.0337 0.0357
04:01-05:00, Fri., 21 Feb. 0.0389 0.0339 0.0359
03:01-04:00, Fri., 21 Feb. 0.0384 0.0337 0.0356
02:01-03:00, Fri., 21 Feb. 0.0375 0.0336 0.0356
01:01-02:00, Fri., 21 Feb. 0.0377 0.0329 0.0356
00:01-01:00, Fri., 21 Feb. 0.0381 0.0334 0.0356
23:01-24:00, Thu., 20 Feb. 0.0379 0.0334 0.0355
22:01-23:00, Thu., 20 Feb. 0.0369 0.0331 0.0353
21:01-22:00, Thu., 20 Feb. 0.0385 0.0329 0.0358
20:01-21:00, Thu., 20 Feb. 0.0371 0.0333 0.0354
19:01-20:00, Thu., 20 Feb. 0.0369 0.0323 0.0353
18:01-19:00, Thu., 20 Feb. 0.0380 0.0329 0.0354
17:01-18:00, Thu., 20 Feb. 0.0377 0.0331 0.0354
16:01-17:00, Thu., 20 Feb. 0.0379 0.0333 0.0355
15:01-16:00, Thu., 20 Feb. 0.0381 0.0328 0.0357
14:01-15:00, Thu., 20 Feb. 0.0386 0.0334 0.0355
13:01-14:00, Thu., 20 Feb. 0.0374 0.0340 0.0357
12:01-13:00, Thu., 20 Feb. 0.0378 0.0323 0.0354
11:01-12:00, Thu., 20 Feb. 0.0390 0.0334 0.0354
10:01-11:00, Thu., 20 Feb. 0.0380 0.0324 0.0352
09:01-10:00, Thu., 20 Feb. 0.0369 0.0335 0.0353
08:01-09:00, Thu., 20 Feb. 0.0370 0.0335 0.0354
07:01-08:00, Thu., 20 Feb. 0.0403 0.0324 0.0357
06:01-07:00, Thu., 20 Feb. 0.0398 0.0336 0.0356
05:01-06:00, Thu., 20 Feb. 0.0392 0.0341 0.0356
04:01-05:00, Thu., 20 Feb. 0.0368 0.0340 0.0357
03:01-04:00, Thu., 20 Feb. 0.0383 0.0330 0.0356
02:01-03:00, Thu., 20 Feb. 0.0378 0.0332 0.0356
01:01-02:00, Thu., 20 Feb. 0.0385 0.0339 0.0355
00:01-01:00, Thu., 20 Feb. 0.0381 0.0323 0.0356
23:01-24:00, Wed., 19 Feb. 0.0384 0.0339 0.0356
22:01-23:00, Wed., 19 Feb. 0.0377 0.0338 0.0356
21:01-22:00, Wed., 19 Feb. 0.0389 0.0339 0.0358
20:01-21:00, Wed., 19 Feb. 0.0380 0.0337 0.0355
19:01-20:00, Wed., 19 Feb. 0.0417 0.0331 0.0356
18:01-19:00, Wed., 19 Feb. 0.0382 0.0335 0.0357
17:01-18:00, Wed., 19 Feb. 0.0393 0.0334 0.0354
16:01-17:00, Wed., 19 Feb. 0.0383 0.0329 0.0356
15:01-16:00, Wed., 19 Feb. 0.0379 0.0337 0.0357
14:01-15:00, Wed., 19 Feb. 0.0380 0.0341 0.0359
13:01-14:00, Wed., 19 Feb. 0.0381 0.0341 0.0357
12:01-13:00, Wed., 19 Feb. 0.0393 0.0330 0.0356
11:01-12:00, Wed., 19 Feb. 0.0375 0.0336 0.0355
10:01-11:00, Wed., 19 Feb. 0.0380 0.0335 0.0357
09:01-10:00, Wed., 19 Feb. 0.0411 0.0332 0.0359
08:01-09:00, Wed., 19 Feb. 0.0372 0.0336 0.0355
07:01-08:00, Wed., 19 Feb. 0.0377 0.0332 0.0357
06:01-07:00, Wed., 19 Feb. 0.0378 0.0336 0.0357
05:01-06:00, Wed., 19 Feb. 0.0408 0.0337 0.0360
04:01-05:00, Wed., 19 Feb. 0.0397 0.0344 0.0362
03:01-04:00, Wed., 19 Feb. 0.0386 0.0338 0.0359
02:01-03:00, Wed., 19 Feb. 0.0399 0.0344 0.0360
01:01-02:00, Wed., 19 Feb. 0.0396 0.0344 0.0360
00:01-01:00, Wed., 19 Feb. 0.0395 0.0338 0.0360
23:01-24:00, Tue., 18 Feb. 0.0388 0.0337 0.0360
22:01-23:00, Tue., 18 Feb. 0.0397 0.0336 0.0362
21:01-22:00, Tue., 18 Feb. 0.0397 0.0341 0.0361
20:01-21:00, Tue., 18 Feb. 0.0377 0.0340 0.0358
19:01-20:00, Tue., 18 Feb. 0.0392 0.0334 0.0357
18:01-19:00, Tue., 18 Feb. 0.0387 0.0339 0.0360
17:01-18:00, Tue., 18 Feb. 0.0380 0.0346 0.0360
16:01-17:00, Tue., 18 Feb. 0.0393 0.0341 0.0362
15:01-16:00, Tue., 18 Feb. 0.0383 0.0336 0.0359
14:01-15:00, Tue., 18 Feb. 0.0379 0.0347 0.0361
13:01-14:00, Tue., 18 Feb. 0.0390 0.0339 0.0360
12:01-13:00, Tue., 18 Feb. 0.0400 0.0319 0.0361
11:01-12:00, Tue., 18 Feb. 0.0395 0.0339 0.0361
10:01-11:00, Tue., 18 Feb. 0.0376 0.0336 0.0358
09:01-10:00, Tue., 18 Feb. 0.0373 0.0343 0.0358
08:01-09:00, Tue., 18 Feb. 0.0390 0.0337 0.0360
07:01-08:00, Tue., 18 Feb. 0.0414 0.0337 0.0363
06:01-07:00, Tue., 18 Feb. 0.0390 0.0336 0.0362
05:01-06:00, Tue., 18 Feb. 0.0390 0.0339 0.0362
04:01-05:00, Tue., 18 Feb. 0.0395 0.0340 0.0360
03:01-04:00, Tue., 18 Feb. 0.0393 0.0334 0.0361
02:01-03:00, Tue., 18 Feb. 0.0388 0.0335 0.0365
01:01-02:00, Tue., 18 Feb. 0.0382 0.0344 0.0363
00:01-01:00, Tue., 18 Feb. 0.0390 0.0345 0.0363
23:01-24:00, Mon., 17 Feb. 0.0386 0.0343 0.0363
22:01-23:00, Mon., 17 Feb. 0.0386 0.0334 0.0361
21:01-22:00, Mon., 17 Feb. 0.0395 0.0345 0.0364
20:01-21:00, Mon., 17 Feb. 0.0383 0.0335 0.0360
19:01-20:00, Mon., 17 Feb. 0.0395 0.0338 0.0365
18:01-19:00, Mon., 17 Feb. 0.0394 0.0347 0.0366
17:01-18:00, Mon., 17 Feb. 0.0391 0.0344 0.0363
16:01-17:00, Mon., 17 Feb. 0.0400 0.0344 0.0365
15:01-16:00, Mon., 17 Feb. 0.0391 0.0343 0.0365
14:01-15:00, Mon., 17 Feb. 0.0405 0.0348 0.0367
13:01-14:00, Mon., 17 Feb. 0.0406 0.0348 0.0371
12:01-13:00, Mon., 17 Feb. 0.0398 0.0340 0.0362
11:01-12:00, Mon., 17 Feb. 0.0392 0.0344 0.0360
10:01-11:00, Mon., 17 Feb. 0.0395 0.0337 0.0359
09:01-10:00, Mon., 17 Feb. 0.0377 0.0338 0.0360
08:01-09:00, Mon., 17 Feb. 0.0394 0.0341 0.0361
07:01-08:00, Mon., 17 Feb. 0.0390 0.0343 0.0363
06:01-07:00, Mon., 17 Feb. 0.0389 0.0335 0.0361
05:01-06:00, Mon., 17 Feb. 0.0393 0.0340 0.0362
04:01-05:00, Mon., 17 Feb. 0.0386 0.0333 0.0361
03:01-04:00, Mon., 17 Feb. 0.0392 0.0345 0.0361
02:01-03:00, Mon., 17 Feb. 0.0399 0.0333 0.0360
01:01-02:00, Mon., 17 Feb. 0.0383 0.0335 0.0359
00:01-01:00, Mon., 17 Feb. 0.0382 0.0344 0.0360
23:01-24:00, Sun., 16 Feb. 0.0391 0.0332 0.0359
22:01-23:00, Sun., 16 Feb. 0.0389 0.0330 0.0358
21:01-22:00, Sun., 16 Feb. 0.0375 0.0338 0.0357
20:01-21:00, Sun., 16 Feb. 0.0378 0.0338 0.0357
19:01-20:00, Sun., 16 Feb. 0.0379 0.0326 0.0358
18:01-19:00, Sun., 16 Feb. 0.0384 0.0334 0.0357
17:01-18:00, Sun., 16 Feb. 0.0381 0.0333 0.0360
16:01-17:00, Sun., 16 Feb. 0.0391 0.0338 0.0363
15:01-16:00, Sun., 16 Feb. 0.0378 0.0342 0.0359
14:01-15:00, Sun., 16 Feb. 0.0391 0.0335 0.0360
13:01-14:00, Sun., 16 Feb. 0.0380 0.0343 0.0363
12:01-13:00, Sun., 16 Feb. 0.0395 0.0348 0.0364
11:01-12:00, Sun., 16 Feb. 0.0396 0.0345 0.0362
10:01-11:00, Sun., 16 Feb. 0.0399 0.0335 0.0359
09:01-10:00, Sun., 16 Feb. 0.0392 0.0340 0.0361
08:01-09:00, Sun., 16 Feb. 0.0388 0.0338 0.0361
07:01-08:00, Sun., 16 Feb. 0.0388 0.0344 0.0360
06:01-07:00, Sun., 16 Feb. 0.0377 0.0339 0.0360
05:01-06:00, Sun., 16 Feb. 0.0403 0.0341 0.0361
04:01-05:00, Sun., 16 Feb. 0.0391 0.0339 0.0360
03:01-04:00, Sun., 16 Feb. 0.0379 0.0331 0.0360
02:01-03:00, Sun., 16 Feb. 0.0399 0.0343 0.0360
01:01-02:00, Sun., 16 Feb. 0.0386 0.0337 0.0360
00:01-01:00, Sun., 16 Feb. 0.0383 0.0332 0.0359
23:01-24:00, Sat., 15 Feb. 0.0379 0.0334 0.0356
22:01-23:00, Sat., 15 Feb. 0.0385 0.0332 0.0356
21:01-22:00, Sat., 15 Feb. 0.0371 0.0334 0.0357
20:01-21:00, Sat., 15 Feb. 0.0379 0.0331 0.0353
19:01-20:00, Sat., 15 Feb. 0.0396 0.0333 0.0355
18:01-19:00, Sat., 15 Feb. 0.0377 0.0335 0.0357
17:01-18:00, Sat., 15 Feb. 0.0379 0.0340 0.0359
16:01-17:00, Sat., 15 Feb. 0.0380 0.0334 0.0356
15:01-16:00, Sat., 15 Feb. 0.0389 0.0334 0.0359
14:01-15:00, Sat., 15 Feb. 0.0376 0.0333 0.0358
13:01-14:00, Sat., 15 Feb. 0.0395 0.0338 0.0361
12:01-13:00, Sat., 15 Feb. 0.0400 0.0330 0.0363
11:01-12:00, Sat., 15 Feb. 0.0383 0.0338 0.0358
10:01-11:00, Sat., 15 Feb. 0.0403 0.0335 0.0357
09:01-10:00, Sat., 15 Feb. 0.0387 0.0325 0.0356
08:01-09:00, Sat., 15 Feb. 0.0386 0.0330 0.0357
07:01-08:00, Sat., 15 Feb. 0.0383 0.0339 0.0356
06:01-07:00, Sat., 15 Feb. 0.0381 0.0335 0.0356
05:01-06:00, Sat., 15 Feb. 0.0385 0.0339 0.0357
04:01-05:00, Sat., 15 Feb. 0.0398 0.0333 0.0355
03:01-04:00, Sat., 15 Feb. 0.0376 0.0339 0.0357
02:01-03:00, Sat., 15 Feb. 0.0378 0.0325 0.0354
01:01-02:00, Sat., 15 Feb. 0.0374 0.0334 0.0354
00:01-01:00, Sat., 15 Feb. 0.0374 0.0331 0.0354
23:01-24:00, Fri., 14 Feb. 0.0371 0.0337 0.0353
22:01-23:00, Fri., 14 Feb. 0.0396 0.0334 0.0357
21:01-22:00, Fri., 14 Feb. 0.0389 0.0336 0.0356
20:01-21:00, Fri., 14 Feb. 0.0384 0.0333 0.0356
19:01-20:00, Fri., 14 Feb. 0.0376 0.0336 0.0355
18:01-19:00, Fri., 14 Feb. 0.0386 0.0334 0.0355
17:01-18:00, Fri., 14 Feb. 0.0384 0.0340 0.0358
16:01-17:00, Fri., 14 Feb. 0.0370 0.0338 0.0357
15:01-16:00, Fri., 14 Feb. 0.0385 0.0324 0.0355
14:01-15:00, Fri., 14 Feb. 0.0385 0.0342 0.0359
13:01-14:00, Fri., 14 Feb. 0.0396 0.0335 0.0359
12:01-13:00, Fri., 14 Feb. 0.0376 0.0338 0.0357
11:01-12:00, Fri., 14 Feb. 0.0374 0.0332 0.0353
10:01-11:00, Fri., 14 Feb. 0.0390 0.0334 0.0359
09:01-10:00, Fri., 14 Feb. 0.0399 0.0337 0.0358
08:01-09:00, Fri., 14 Feb. 0.0391 0.0343 0.0361
07:01-08:00, Fri., 14 Feb. 0.0401 0.0343 0.0363
06:01-07:00, Fri., 14 Feb. 0.0392 0.0338 0.0359
05:01-06:00, Fri., 14 Feb. 0.0382 0.0338 0.0358
04:01-05:00, Fri., 14 Feb. 0.0386 0.0339 0.0357
03:01-04:00, Fri., 14 Feb. 0.0376 0.0333 0.0357
02:01-03:00, Fri., 14 Feb. 0.0378 0.0341 0.0358
01:01-02:00, Fri., 14 Feb. 0.0382 0.0332 0.0356
00:01-01:00, Fri., 14 Feb. 0.0385 0.0338 0.0356
23:01-24:00, Thu., 13 Feb. 0.0397 0.0334 0.0355
22:01-23:00, Thu., 13 Feb. 0.0421 0.0338 0.0357
21:01-22:00, Thu., 13 Feb. 0.0387 0.0334 0.0356
20:01-21:00, Thu., 13 Feb. 0.0385 0.0331 0.0358
19:01-20:00, Thu., 13 Feb. 0.0388 0.0333 0.0358
18:01-19:00, Thu., 13 Feb. 0.0391 0.0339 0.0357
17:01-18:00, Thu., 13 Feb. 0.0379 0.0343 0.0361
16:01-17:00, Thu., 13 Feb. 0.0379 0.0334 0.0359