DEFRA corrects air quality reports

The environment department (DEFRA) has corrected errors from two reports on guidelines for levels of halides, metals and metalloids in ambient air issued in June (ENDS Report 413, p 42 ). The reports came from its Expert Panel on Air Quality Standards (see table).

The hydrogen iodide figure was given in grams rather than micrograms, putting it out by a factor of one million. The hydrogen fluoride concentration was given as 0.02 micrograms per cubic metre, but should have been 0.016 milligrams per cubic metre.

There was a discrepancy within the report on metals and metalloids. Its main body gave a figure of 0.02µg/m3 for nickel, but its summary and the letter gave a figure ten times higher.

DEFRA said the errors were due to type-setting and proof-reading failures.

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