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Journal Article 
Effects of continuous exposure of navel oranges to nitrogen dioxide 
Thompson, CR; Hensel, EG; Kats, G; Taylor, OC 
Atmospheric Environment
ISSN: 1352-2310
EISSN: 1873-2844 
The continuous exposure of navel orange trees to 0.5 and 1.0 ppm of nitrogen dioxide for 35 days caused severe defoliation and leaf chlorosis. Exposure of the trees to 0.25 ppm and lower levels caused increased leaf drop and reduced fruit yield. At present it seems unlikely that atmospheric concentrations of oxides of nitrogen in the test area are causing injury to citrus. 
• ISA NOxSOxPM Ecology (2018)
     Cited in First Draft
          Chapter 3
     Cited in the Second Draft
          Appendix 3