The increasing effect of environmental, occupational and climate change poses serious global threat for public health. More than half of the world’s populations, including around 85% people in Bangladesh, are exposed to household air pollutants (HAP). Environmental consequences of climate change are among the highest. Little evidence is available on the effects of HAP on cardiopulmonary outcomes in low-income populations. Same is true for occupational health and climate change. The primary research focus of Bangladesh GEOHealth Hub is to explore association between HAP and pre-clinical measures of cardio-pulmonary function and markers of immune dysfunction among non-smoking individuals. The investigators will also evaluate intervention with improved cookstove on reduction in HAP and improvement in pre-clinical and molecular measures of cardio-pulmonary and immune dysfunctions.