§ Mr. Alfred MorrisTo ask the Secretary of State for the Environment what have been the levels of high-level ozone over the United Kingdom for the last three dates for which figures have been recorded; and what were the figures for equivalent dates in each of the last 10 years.
§ Mr. MacleanThe most recent three days for which total column ozone measurements are available from Lerwick, Scotland and Camborne, Cornwall are 13,14 and 15 March. The measurements, together with measurements on the same dates for the past 10 years are as follows:
Dobson Spectrophotometer Ozone Measurement in Dobson Units (DU) Lerwick, Scotland Camborne, Cornwall 13 March 14 March 15 March 13 March 14 March 15 March 1993 330 360 342 331 324 1992 360 330 303 447 440 331 1991 350 339 336 1990 337 334 313 328 393 1989 385 321 352 433 502 475 1988 391 392 357 456 464 444 1987 403 385 360 387 1986 359 341 316 342 375 314 1985 358 409 427 1984 378 370 414 391 360 373 1983 322 353 345 506 457 408 Blanks in the table indicate where measurements could not be made, due to certain conditions of wind, rain and cloud. Data for 1990–1993 are provisional pending final calibration in the summer.