#include <LiquidCrystal_I2C.h>
#include <Wire.h>
LiquidCrystal_I2C lcd(0x27,16,2);
int mq=A0;
void setup() {
  lcd.begin(16,2);
  lcd.backlight();
  pinMode(mq,INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int v=analogRead(mq);
if(v<=300)
{ 
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("air qulty ");
  lcd.setCursor(5,1);
  lcd.print("NORMAL");
}
if(v>=300 && v<=700)
{ lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("air qulty ");
  lcd.setCursor(5,1);
  lcd.print("ALCOHALIC");
}
else
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("air qulty ");
  lcd.setCursor(5,1);
  lcd.print("FIRE");
}
delay(1000);
}