Research On The Relationships Of The Effect On Contaminations And Health Caused By Climate Change

OBJECTIVE: To research the relationship between ambient temperature(T_a)and personally exposed temperature(T_p), and grope for the criticaltemperature(T_c) to personally tolerance. Study on formaldehyde emissioninfluenced by temperature and relative humidity from artificial wood-basedboard and set up predictive model for formaldehyde emission. To research therelationship between climate change and symptom, and grope for the rule ofblood pressure undulation.METHODS: Personal exposures to temperature and natural temperature weremeasured for one year with portable monitors (HOBO H8 Loggers, OnsetComputer Corporation) for 40 houses (20 males and 20 females, aged43.1-75.4 years), from July, 2004 to September,2005. Six hundred and fiftypersons in Nanjing City were surveyed through questionnaires by a method ofrandom sampling. Use environmental climate chamber to get formaldehydeemission in different temperature and relative humidity. Investigators keepsymptom under surveillance for 30 houses, from Jan, 2006 to Jan, 2007.RESULTS: T_a is higher than T_r and T_p(P＜0.05) in summer. T_a is lower thanT_r and T_p(P＜0.05) in winter.Two-way scatterplot matrix suggests that amongT_a,T_r and T_p all has linear correlation.The critical temperature in summer is31-32℃. The critical temperature in winter is 3-4℃. The rate of using aircondition is 79.5%.When people use air condition, out-room maximaltemperature is 31.1±3.2℃in summer, out-room minimum temperature2.94±3.5℃in winter.The relationship between formaldehyde emission and temperature is linear correlation (P＜0.05, adjusted R~2=0.9963), between formaldehydeemission and humidity is hyperbola correlation. Equation of linear regressionis Yhat=0.6368+0.0821T_e-0.0695 H_u+0.0007H_u~2.When temperature is stabile,relative humidity is 46.9%, formaldehyde emission is minimum. Therelationship between formaldehyde emission and temperature withno-painting, one-side painting and two-sides painting all can be fit intwo-parameter exponential model.The shape of three curve is at the same. Theoriginal concentration of formaldehyde from no-painting is the same asone-side painting. But no-painting or one-side painting is different fromtwo-sides painting (P＜0.05).The curve of blood pressure change(SBP and DBP) presents "V" innormotensive subjects and hypertension subjects.The lowest value appears inSummer(June,July and August). The biggest value appears in Winter (Dec, Janand Feb). The blood pressure in Winter is all higher than in Summer(P＜0.05).The seasonal lowering(Winter-Summer) averages 9.1±8.74(SBP)/4.9±6.43(DBP) in hypertension subjects and 5.4±10.41(SBP)/3.0±8.51(DBP)in normotensive subjects.The correlation coefficient is -0.535(P＜0.001)between SBP and average temperature,-0.302(P＜0.001) between DBP andaverage temperature.CONCLUSION: It has obvious difference between ambient temperature andpersonally exposed temperature. Personally exposed temperature is mostlyinfluenced by ambient temperature. When ambient temperature exceeds theolder's ability of temperature stress tolerance, people begin to take somemeasures to control temperature.Formaldehyde emission from artificial wood-based cleat is influenced bytemperature,relative humidity and ployester varnish. Formaldehyde emissionincreases as temperature increases. It slightly decreases first, then increases asrelative humidity increases. Ployester varnish can block formaldehyde emission. The function is as smaller as temperature higher. Prevent fitmentpollution in summer is very important.BP varies by season, with higher values in winter.It is very important forhypertension subjects.