Rain water collected at Watford, Hertfordshire, England, contains more chemical matter —i.e., sulphate—than that collected at Westminster, proving that London air is, at times at least, purer than the air in. the suburbs.
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Southland Times, Issue 20897, 5 October 1929, Page 14
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33Page 14 Advertisements Column 3 Southland Times, Issue 20897, 5 October 1929, Page 14
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