void setup()
{
Serial.begin(9600);
airqualitysensor.init(A0);
pinMode(GREEN, OUTPUT);
pinMode(RED, OUTPUT);
pinMode(SOUND, OUTPUT);
}
void loop()
{
current_quality=airqualitysensor.slope();
if (current_quality >= 0)
{
if (current_quality==0) {
digitalWrite(RED, HIGH);
delay(50);
digitalWrite(RED, LOW);
delay(10);
digitalWrite(SOUND, HIGH);
delay(analogRead(0));
digitalWrite(SOUND, LOW);
delay(analogRead(0));
delay(100);}