349
Changes in BHR were found to correlate significantly with changes in the levels of 24 h mean SO2 , NO2 and smoke ; 48 h mean NO2 and smoke ; 24 h lag NO2 ; although the effect was only small , accounting for approximately 10 % of the variability in within - subject BHR between visits .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None