def extract_parameters(soup):
    """Find all pollutant choices and their selectors

    """
    para_list_html = soup.find_all(attrs={'id': 'parameter_name'})[0]
    para_children = para_list_html.findChildren('option', recursive=False)

    para_selector_list = []
    para_name_list = []
    for child in para_children:
        para_selector_list.append(child.attrs['value'])
        para_name_list.append(child.string)
    return para_selector_list, para_name_list