require 'nokogiri'

page = Nokogiri::HTML(open("dn.html"))
td = page.xpath('/html/body/div[1]/table[6]//tr[2]//td')
text_content = td.text.delete("\n").delete("\r")
regex = /([\w-]{9})(.*)Pot\. Poluidor.*Geral:(.*)Porte:(.*): Pequeno(.*): Médio(.*): Grande/
match = text_content.match(regex)

text = match[6]

text.chars.each do |x|
    p x + "  -  " + x.ord.to_s + "  -  " + (x.ord == [160].pack('U')).to_s
end

# OUTPUT
# "n  -  110  -  false"
# "o  -  111  -  false"
# "   -  160  -  false"
# "   -  160  -  false"
# "   -  32  -  false"