DHT22 MQxx ESP

#include <DHTesp.h>
#include <ESP8266WiFi.h>

/*
#include <MemoryFree.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <EEPROM.h>
*/

#define DHTTYPE DHT22
#define DHTPIN 7
float hum;
float temp;
DHTesp dht;

const char* ssid = "raz01";
const char* password = "xxxxxxx";
/*
ESP8266WebServer server(80);
MDNSResponder mdns;
*/

String MQ135;


void setup() {
WiFi.begin(ssid, password);
Serial.begin(9600);
while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());


dht.setup(13, DHTesp::DHT22);
}

void loop() {
delay(dht.getMinimumSamplingPeriod());

 hum = dht.getHumidity();
 temp= dht.getTemperature();
 MQ135 = String(analogRead(A0));
 delay(500);


 Serial.print(dht.getStatusString());
 delay(500);
  Serial.print("Humidite: ");
  Serial.print("\t\t");
  Serial.print(hum, 1);
  Serial.println("%");
  Serial.print("Temperature");
  Serial.print("\t\t");
  Serial.print(temp, 1);
  Serial.println("C");
 Serial.print("Qualite de l'air: ");
 Serial.println(MQ135);

 delay(5000);
}