Daily smoking among employees is also more common in workplaces with lax or absent smoke-free policies.Risk of SHS exposure in these environments is further compounded by potential exposure to other toxins, such as asbestos; workers in the building trades demonstrate higher risk for lung cancer and nerve damage as a result of work-place toxic exposures, including SHS.Enforcing clean indoor air laws is also a substantial task distributed among a variety of city and county agencies across the state and enforcement is unevenly applied. A study of clean indoor air policy enforcement and compliance by the California Tobacco Control Program found that about half of the agencies in the state tasked with enforcement had conducted workplace compliance checks in the previous year and approximately one-third did not report engaging in any SHS enforcement activity the year prior. Rural county agencies were also less likely to engage in enforcement activities than urban and suburban agencies.Additionally, certain types of bars may be especially resistant to adopting clean indoor air policies; for example, studies in San Francisco and Los Angeles have found persistent indoor smoking in Irish and Korean bars, respectively.SHS exposure has been linked to excess mortality and years of potential life lost, especially among non-white populations, primarily as a result of cardiovascular disease or lung cancer.It has also been associated with the development of respiratory disease among children and adolescents as well as young adults employed in workplaces without smoke free policies.Furthermore, there is growing evidence that the accumulation of SHS residue on surfaces, or third hand smoke, may also be harmful to health and that third hand smoke toxicity increases over time.Alternatively, studies measuring health exposures and effects following the implementation of comprehensive smoke-free workplace policies indicate that such policies are effective in restoring lung function in otherwise healthy workers,pot drying reducing tobacco use among employees and reducing cardiovascular disease morbidity as well as hospital admissions for heart attack.
Although young adults have been identified as having greater risk of workplace SHS exposure, we were unable to identify any study looking at occupational differences in exposure in this population. Using data from the 2014 San Francisco Bay Area Young Adult Health Survey , a probabilistic household sample of young adults aged 18–26 in Alameda and San Francisco Counties, we investigate whether differences by occupation exist and what other sociodemographic and behavioural factors may account for such discrepancies. Specifically, we hypothesise that young adults working in service, construction and trades sectors, that is, lower income occupations with greater likelihood of exemption from California’s Smoke-Free Workplace Act, will report greater SHS exposure in the workplace. This study used data that we collected as part of the 2014 San Francisco Bay Area Young Adult Health Survey, a probabilistic multimode household survey of young adults aged 18– 26 years, stratified by race/ethnicity.32 The study area included Alameda and San Francisco Counties in California. We identified potential respondent households using address lists obtained from Marketing Systems Group ; there was an ~40% chance that an eligible young adult resided at a selected address . We further used 2009–2013 American Community Survey and 2010 decennial census data in a multistage sampling design to identify Census Block Groups and subsequently Census Blocks in which at least 15% of residents were Latino or non-Hispanic black adults in the eligible age range in order to randomly select 61 blocks . We oversampled these blocks as young, non-white, urban adults are among the most difficult populations to survey.We then canvassed each selected block to create housing unit lists from which housing units were randomly selected, and on visiting each household we asked whether a young adult in the eligible age range resided there and if we could speak to the youngest or oldest young adult according to our randomisation procedure. We conducted the survey in three phases and employed four modes . In the first phase, we conducted three mailings over the course of 6 weeks with sample 1 households, and respondents returned paper questionnaires or completed surveys online using Qualtrics. In the second phase, we reached out to mail non-responders via telephone, and finally we conducted face-to-face interviews with a random selection of the remaining non-responders from sample 1 as well as all of the households identified in sample 2.
Potential sample 2 respondents did not participate in the mail or telephone phases of the survey; each of these households was visited in person to supplement the original sample and maximise the possibility for completing questionnaires among Latino and black young adults. The final sample consisted of 1363 young adult participants, reflecting a response rate of ~30%, with race, sex and age distributions closely reflecting those of the young adult population overall in the two counties surveyed. Approximately two-thirds of respondents replied via mail or online with most of the remaining responses completed in the face-to-face phase; only a handful of questionnaires were completed via telephone. Individual sample and post stratification adjustment weights were constructed after data collection. Using a representative population-based sample of young adults in the San Francisco Bay Area, we evaluated differences in self-reported workplace SHS exposure by occupation. To the best of our knowledge, this is the first study focusing on occupational disparities in SHS exposure among young adults. Consistent with past findings among employed adults across the age range and with our hypothesis, we found that young adults working in lower wage occupations report greater workplace SHS exposure.In particular, young adults employed in service, construction, maintenance, transportation and material moving sectors appear to be at greatest risk. These occupational sectors are also more likely to be exempt from California’s Smoke-Free Workplace policy.We also found very good or excellent self-rated health to be inversely related to workplace SHS exposure, suggesting that employees in better health may be less sensitive to SHS or may be more likely to work in environments with stringent smoke-free policies. Alternatively, variations in the amount of exposure within occupation may mean that employees experiencing less SHS exposure are healthier than their counterparts. Additionally, non-Hispanic black young adults were at greater risk of workplace SHS exposure before controlling for self-rated health, indicating that self-assessed health is a mitigating factor in reporting SHS exposure for this population. It is notable that nearly all of the young adults reporting SHS workplace exposure indicated that they were exposed outdoors at their workplace. Employees in the occupations implicated may have more occasion to be outdoors due to the types of job duties they perform, such as at a construction site or loading dock or serving customers on an outdoor bar patio. Thus while clean indoor air laws appear to be reducing SHS exposure indoors,cannabis drying more attention needs to be paid to outdoor areas immediately surrounding workplaces.
California as well as San Francisco and Alameda Counties do have smoke-free entrances policies in place that disallow smoking within a ‘reasonable distance’ of entrances to commercial, multiunit residential or mixed-use buildings, but the extent to which these policies are enforced or followed is an open question. Recently, the Tobacco Free Project at San Francisco County Department of Public Health implemented a media campaign under the banner ‘curb it’ designed to better inform the public and business owners about the smoke-free entrances policy,but more such efforts sustained over time and backed by enforcement procedures with teeth may be required to substantially reduce the type of outdoor workplace exposure experienced by the young adults in our sample. More than one-third of the civilian employed young adult population in California works in these occupations at greatest risk of workplace SHS exposure, equating to upwards of one million young adult workers.Latino young adults, a population identified in prior studies as at greater risk of exposure, are also disproportionately represented in service and construction sectors while those identifying as other or multiple races and women are also over represented in service sectors.Young adults employed in service occupations also have the lowest average annual earnings compared to other employees .Malaria is a significant public health problem affecting predominantly vulnerable pregnant women and children in Africa. Interestingly, in Southeast Asia, there has been a change in malaria epidemiology where the adult male population has borne a greater burden of disease. Although there is a strong correlation between malaria and poverty, malaria is both a cause and a consequence of poverty. Malaria’s devastating effects have historically been observed in countries of the Greater Mekong Subregion . Since the inception of the World Health Organization’s Mekong Malaria Program a decade ago, the malaria situation in the GMS has been greatly improved, reflected by the continuous decline in annual malaria incidence and deaths. However, as all countries within the GMS are moving towards malaria elimination, significant challenges remain, particularly in Myanmar, where the regional malaria burden is the heaviest . Malaria epidemiology in this region has several characteristics, including being an epicenter of antimalarial drug resistance, high malaria transmission in the forested fringe areas and in the remote border region, and cross-border malaria introduction due to human movement. For example, over 90% of the imported falciparum malaria in China was introduced across the China-Myanmar border.
As the GMS countries aim at malaria elimination by 2030, it is crucial to examine the current situations of malaria epidemiology and vector biology in the high-risk border region so that optimal elimination strategies can be developed. Vector control has historically been the most effective method to reduce malaria transmission. It remains the most important tool available, but its effectiveness relies on a thorough understanding of vector biology and their interactions with the environment. Due to human population expansion and an increasing demand for food supply, deforestation has become a very serious problem in the China-Myanmar border area. Consequently, previously forested areas are often converted to lands for subsistence and cash crops. The changes in the environmental conditions in the area have been shown to alter malaria vector species composition and in turn, malaria transmission. Different vector species vary in their feeding behaviors and vector competence. However, the ecological mechanisms underlying malaria vector species succession are not well understood. The objective of the present study is to determine the effects of land use and land cover on the adult survivorship of major malaria vector species in the China-Myanmar border area using the life-table experiments. We found that mosquito survivorship was strongly influenced by the micro-climatic conditions such as ambient temperature, which is directly affected by land use and land cover. This information is useful for predicting the impact of environmental and climate changes on vectorial capacity.No specific permits were required for the described field studies. For mosquito collection in banana fields, oral consent was obtained from field owners in each location. These locations were not protected land, and the field studies did not involve endangered or protected species. The use of mice in mosquito blood-feeding was performed in strict accordance with the recommendations in the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health. All of the animals were handled according to approved institutional animal care and use committee protocols of University of California at Irvine.The study was conducted in the China-Myanmar border region . The study sites were located in Kachin State, Myanmar and Yingjiang County of Yunnan Province, China . The study area covered an area of about 100 km2 , including two villages in China and one site near the town of Laiza, Kachin State in Myanmar. The two sites in China differ in elevation with Nabang at 240 m and Daonong at 660 m above sea level. The site in Myanmar, Je Yang Hka, is about 5 km from Nabang with an elevation of ~200 m above sea level. The study area is a hilly area, with mountains being covered mainly by forest or maize/banana plantations after deforestation and the valley areas being covered by banana plantations. Rubber, black pepper, and banana farming are the predominant agricultural activities, and food crops of mostly maize are cultivated at a very small scale. The average annual rainfall in the past 30 years was 1,464 mm and average monthly ambient temperature was 19.3°C.